PIC-5428
Service Bulletin Details
Public Details for: PIC-5428
Gm: the brake, traction, or stability lights are on because of debris stuck on the wheel speed sensor. Updated on 06/15/2011. *kb updated on 06/20/2011. *rm updated 6/27/11. *pe updated 10/3/11. *pe updated 05/08/2013 *js u
- 2014 - 2013 - 2012 - 2011 - 2010 - 2009 - 2008 - 2007 -
Models from 2014
2014 CHEVROLET IMPALA |
Models from 2013
Models from 2012
Models from 2011
Models from 2010
Models from 2009
2009 BUICK ENCLAVE |
2009 CADILLAC CTS |
2009 CHEVROLET COLORADO |
2009 CHEVROLET TRAVERSE |
2009 GMC ACADIA |
2009 GMC CANYON |
2009 SATURN OUTLOOK |
Models from 2007
2007 GMC ACADIA |
2007 SATURN OUTLOOK |
SB-10038468-1224 Service Bulletin File in Section: - Bulletin No.: PIC5428F Date: May, 2014 PRELIMINARY INFORMATION Subject: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message -Click Or Ratchet NoiseService Traction Message - Service Stabilitrak Message - Service Steering Message Models: 2008-2014 Buick Enclave 2010-2014 Buick LaCrosse 2011-2014 Buick Regal 2012-2014 Buick Verano (2014 MY: front driven wheel bearings only) 2013-2014 Cadillac ATS – AWD / RWD (driven wheel bearings only) 2014 Cadillac CTS (VIN A incl. V-Sport) 2008-2014 Cadillac CTS/CTS-V 2010-2014 Cadillac CTS Wagon 2011 2014 Cadillac CTS/CTS-V Coupe 2010-2014 Cadillac SRX (driven wheel bearings only) 2013-2014 Cadillac XTS 2010-2014 Chevrolet Camaro 2011-2014 Chevrolet Camaro Convertible 2009-2012 Chevrolet Colorado 2011-2014 Chevrolet Cruze, Volt (2014 MY: front driven wheel bearings only) 2010-2014 Chevrolet Equinox 2014 Chevrolet Impala (New Body Style) 2013-2014 Chevrolet Malibu 2009-2014 Chevrolet Traverse 2009-2014 GMC Canyon 2007-2014 GMC Acadia 2010-2014 GMC Terrain 2007-2010 Saturn Outlook with any of the following DTCs or Symptom codes C0035 C0040 C0045 C0050 with symptom bytes 18 5A 0F This PI was superseded to update model list. Please discard PIC5428E. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Some customers may comment on any of the following conditions. • The ABS, Service Traction Control System, and/or Service Stabilitrak telltale lights are on. During initial scan for EBCM module diagnostic codes you may find one or more of the following DTCs C0035-C0050 with specifically symptom bytes 18, 5A, 0F. Note: For vehicles equipped with Electric Power Steering RPO NJ2 only - Operator may also notice a Service Steering Message displaying in the Driver Information Center (DIC) and will experience heavier steering feel at low speed or static steering maneuvers when this happens. This will be accompanied with the Power Steering Control Module setting DTC U0415. This is a normal default action with the loss of a Wheel Speed Sensor signal. If DTC U0415 remains after removal of the Wheel Speed Sensor debris refer to published diagnostics. • A brief and intermittent noise, click, ratchet, grind, or ABS pump motor noises typically heard from the inside of the vehicle at parking lot speeds. A flashing Traction Control or Stabilitrak telltale at low speeds. The latter two conditions correspond with no reported EBCM / ABS / Stability DTCs set current or history. These conditions may be caused by single or multiple pieces of ferrous metallic debris stuck to the wheel speed sensor magnetic encoder ring. This magnetic encoder ring is now part of the inboard bearing hub assembly. Note: NOTE: THIS INFORMATION IS NOT APPLICABLE TO CAPPED WHEEL BEARINGS. 3765975 (1.) Capped Wheel Bearing Background Information: 2596034 (1.) Wheel Speed Sensor Magnetic Encoder Ring - North and South Poles are shown New Bearing Design. 2596032 (1.) Magnetic Encoder Ring Some new model vehicles today have begun to use a different type of wheel speed sensor encoder ring or tone wheel. Instead of a traditional mechanical type tooth tone wheel, the wheel speed sensor tone wheel is now made of a magnetized nitrile rubber ring, typically brown in color. This magnetic encoder consists of multiple North and South Pole pairs surrounding the outer circumference. When this magnetic encoder ring rotates and passes by the wheel speed sensor head; it generates a sign wave in the wheel speed sensor. The wheel speed sensor converts an analog signal to a digital square wave, and typical digital signal values switch between 7mA (Low) and 14mA (High) DC current. Recommendation/Instructions Inspect and clean debris from the Encoder Ring. Inspection and Cleaning Procedure: Below inspection and cleaning procedure is supporting information to the SI wheel speed sensor diagnostic mechanical fault table. In most cases the DTCs C0035-C0050 with symptom bytes 18, 5A, 0F can be repaired by removing and/or cleaning any accumulated debris on the magnetic encoder ring; which is located on the inboard side of the bearing hub. Important: Most repairs can be performed without any replacement of the bearing hub assembly or wheel speed sensor. Caution: Take care not to damage the bearing outer seal when brushing and/or cleaning the magnetic encoder debris Do not use any type of magnetic tool to remove the debris from the bearing magnetic encoder; an external magnet can damage the encoder. BEFORE CLEANING 2596037 (1.) Sample Debris 1. Based on the specific EBCM module Wheel Speed Sensor DTC code; inspect the appropriate corner magnetic encoder ring for possible debris. – C0035 Left Front Corner – C0040 Right Front Corner – C0045 Left Rear Corner – C0050 Right Rear Corner 2. If debris is found, perform the following cleaning recommendations. Important: To properly clean the magnetic encoder ring, some applications may require removal of the bearing/hub assembly. Refer to the specific Wheel Bearing and Hub Replacement procedure in SI. 2.1. Gently using a dry nylon soft bristle brush, remove the foreign debris off the magnetic encoder ring. If debris was removed, proceed to step 3. 2.2. If debris still remains, wash the encoder ring using a mild soap detergent and wipe dry. AFTER CLEANING 2596035 1. Connect a scan tool to the vehicle. Turn ON the ignition. Clear the DTCs. 2. Perform vehicle diagnostic repair verification procedure for DTC: C0035-C0050. Refer to SI. Warranty Information For vehicles repaired under warranty use: Labor Operation * 2480068 * 2480078 Description Inspect and Clean Debris From Front Wheel Speed Sensor Encoder Ring (One Side) Inspect and Clean Debris From Rear Wheel Speed Sensor Encoder Ring (One Side) Vehicle(s) Involved Labor Time Camaro, CTS VIN D (RWD), Colorado (RWD), Canyon (RWD) 0.4 hr SRX, Volt 0.7 hr ATS (AWD), CTS VIN A/D (AWD), Acadia, Enclave, Outlook, Traverse, Equinox, Terrain, Cruze, Verano 1.0 hrs LaCrosse, Regal 0.9 hr Malibu 0.8 hr Impala, XTS 1.6 hr Colorado (4WD), Canyon (4WD) 1.9 hr Acadia (FWD), Enclave (FWD), Outlook (FWD), Traverse (FWD), SRX (FWD), LaCrosse (FWD), Regal (FWD), Equinox (FWD), Terrain (FWD), Malibu, Impala, XTS (FWD) 0.4 hr Camaro, CTS VIN D, Equinox (AWD), Terrain (AWD) 0.9 hr SRX (AWD), ATS, CTS VIN A 1.1 hrs LaCrosse (AWD), Regal (AWD) 2.1 hrs Acadia (AWD), Enclave (AWD), Outlook (AWD), Traverse (AWD) 1.0 hrs Volt 0.8 hr Cruze, Verano 0.6 hr XTS (AWD) 1.4 hr *This is a unique labor operation number for PI use only. This will not be published in the Labor Time Guide. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. SB-10038468-2582 File in Section: Service Bulletin Bulletin No.: Date: PIC5428D March, 2013 PRELIMINARY INFORMATION Subject: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message - Click Or Ratchet Noise Service Traction Message - Service Stabilitrak Message Models: 2008-2013 Buick Enclave 2010-2013 Buick LaCrosse 2011-2013 Buick Regal 2012-2013 Buick Verano 2008-2013 Cadillac CTS/CTS-V 2010-2013 Cadillac CTS Wagon 2011 2013 Cadillac CTS/CTS-V Coupe 2010-2013 Cadillac SRX 2013 Cadillac XTS - FWD Models (rear non-driven wheel bearings only) 2010-2013 Chevrolet Camaro 2011-2013 Chevrolet Camaro Convertible 2009-2012 Chevrolet Colorado 2011-2013 Chevrolet Cruze, Volt 2010-2013 Chevrolet Equinox 2014 Chevrolet Impala (New Body Style) 2013 Chevrolet Malibu 2009-2013 Chevrolet Traverse 2009-2012 GMC Canyon 2007-2013 GMC Acadia 2010-2013 GMC Terrain 2007-2010 Saturn Outlook with any of the following DTCs or Symptom codes C0035 C0040 C0045 C0050 with symptom bytes 18 5A 0F This PI was superseded to update model list, model years, and condition/concern. Please discard PIC5428C. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern Some customers may comment on any of the following conditions: • ABS, Service Traction Control System, and/or Service Stabilitrak telltale lights are on. During initial scan for EBCM module diagnostic codes you may find one or more of the following DTCs C0035-C0050 with specifically symptom bytes 18, 5A, 0F. • A brief and intermittent noise, click, ratchet, grind, or ABS pump motor noises typically heard from the inside of the vehicle at parking lot speeds. • A flashing Traction Control or Stabilitrak telltale at low speeds. The latter two conditions correspond with no reported EBCM / ABS / Stability DTCs set current or history. These conditions may be caused by single or multiple pieces of ferrous metallic debris stuck to the wheel speed sensor magnetic encoder ring. This magnetic encoder ring is now part of the inboard bearing hub assembly. Background Information: 2596034 1. Wheel Speed Sensor Magnetic Encoder Ring North and South Poles are shown NEW BEARING DESIGN 2596032 1. Magnetic Encoder Ring Some new model vehicles today have begun to use a different type of wheel speed sensor encoder ring or tone wheel. Instead of a traditional mechanical type tooth tone wheel, the wheel speed sensor tone wheel is now made of a magnetized nitrile rubber ring, typically brown in color. This magnetic encoder consists of multiple North and South Pole pairs surrounding the outer circumference. When this magnetic encoder ring rotates and passes by the wheel speed sensor head; it generates a sign wave in the wheel speed sensor. The wheel speed sensor converts an analog signal to a digital square wave, and typical digital signal values switch between 7mA (Low) and 14mA (High) DC current. Recommendation/Instructions Inspect and clean debris from the Encoder Ring. Inspection and Cleaning Procedure: Below inspection and cleaning procedure is supporting information to the SI wheel speed sensor diagnostic mechanical fault table. In most cases the DTCs C0035-C0050 with symptom bytes 18, 5A, 0F can be repaired by removing and/or cleaning any accumulated debris on the magnetic encoder ring; which is located on the inboard side of the bearing hub. Important: Most repairs can be performed without any replacement of the bearing hub assembly or wheel speed sensor. Caution: Take care not to damage the bearing outer seal when brushing and/or cleaning the magnetic encoder debris. Do not use any type of magnetic tool to remove the debris from the bearing magnetic encoder; an external magnet can damage the encoder. BEFORE CLEANING 2596037 1. Sample Debris 1. Based on the specific EBCM module Wheel Speed Sensor DTC code; inspect the appropriate corner magnetic encoder ring for possible debris. – C0035 Left Front Corner – C0040 Right Front Corner – C0045 Left Rear Corner – C0050 Right Rear Corner 2. If debris is found, perform the following cleaning recommendations. Important: To properly clean the magnetic encoder ring, some applications may require removal of the bearing/hub assembly. Refer to the specific Wheel Bearing and Hub Replacement procedure in SI. 2.1. Gently using a dry nylon soft bristle brush, remove the foreign debris off the magnetic encoder ring. If debris was removed, proceed to step 3. 2.2. If debris still remains, wash the encoder ring using a mild soap detergent and wipe dry. AFTER CLEANING 2596035 3. Connect a scan tool to the vehicle. Turn ON the ignition. Clear the DTCs. 4. Perform vehicle diagnostic repair verification procedure for DTC: C0035-C0050. Refer to SI. Warranty Information For vehicles repaired under warranty use: Labor Operation * H9757 * H9758 Description Inspect and Clean Debris From Front Wheel Speed Sensor Encoder Ring (One Side) Inspect and Clean Debris From Rear Wheel Speed Sensor Encoder Ring (One Side) Vehicle(s) Involved Labor Time Camaro, CTS (RWD), Colorado (RWD), Canyon (RWD) 0.4 hr SRX, Volt 0.7 hr CTS (AWD), Acadia, Enclave, Outlook, Traverse, Equinox, Terrain, Cruze, Verano 1.0 hrs LaCrosse, Regal 0.9 hr Malibu 0.8 hr Impala, XTS 1.6 hr Colorado (4WD), Canyon (4WD) 1.9 hr Acadia (FWD), Enclave (FWD), Outlook (FWD), Traverse (FWD), SRX (FWD), LaCrosse (FWD), Regal (FWD), Equinox (FWD), Terrain (FWD), Malibu, Impala, XTS (FWD) 0.4 hr Camaro, CTS, Equinox (AWD), Terrain (AWD) 0.9 hr SRX (AWD) 1.1 hrs LaCrosse (AWD), Regal (AWD) 2.1 hrs Acadia (AWD), Enclave (AWD), Outlook (AWD), Traverse (AWD) 1.0 hrs Volt 0.8 hr Cruze, Verano 0.6 hr XTS (AWD) 1.4 hr *This is a unique labor operation number for PI use only. This will not be published in the Labor Time Guide. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. SB-10038468-2722 File In Section: Bulletin No.: Date: Service Bulletin PIC5428 March, 2011 PRELIMINARY INFORMATION Subject: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message - Service Traction Message - Service Stabilitrak Message Models: 2008-2011 Buick Enclave 2008-2011 Cadillac CTS/CTS-V 2010-2011 Cadillac CTS Wagon 2011 Cadillac CTS/CTS-V Coupe 2010-2011 Cadillac SRX 2009-2011 Chevrolet Traverse 2010-2011 Chevrolet Equinox 2011 Chevrolet Cruze, Volt 2007-2011 GMC Acadia 2010-2011 GMC Terrain 2007-2010 Saturn Outlook with any of the following DTCs or Symptom codes C0035 C0040 C0045 C0050 with symptom bytes 18 5A 0F. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: A customer may comment the ABS, Service Traction Control System, and/or Service Stabilitrak telltale lights are on. During initial scan for EBCM module diagnostic codes you may find one or more of the following DTC’s C0035C0050 with specifically symptom bytes 18, 5A, 0F. This condition may be caused by single or multiple pieces of ferrous metallic debris stuck to the wheel speed sensor magnetic encoder ring. This magnetic encoder ring is now part of the inboard bearing hub assembly. Background Information: Copyright 2011 General Motors. All Rights Reserved. Page 2 March, 2011 SB-10038468- Bulletin No.: PIC5428 2596034 (1) Wheel Speed Sensor Magnetic Encoder Ring North and South Poles are shown New Bearing Design 2596032 1) Magnetic Encoder Ring Some new model vehicles today have begun to use a different type of wheel speed sensor encoder ring or tone wheel. Instead of a traditional mechanical type tooth tone wheel, the wheel speed sensor tone wheel is now made of a magnetized nitrile rubber ring, typically brown in color. This magnetic encoder consists of multiple North and South Pole pairs surrounding the outer circumference. When this magnetic encoder ring rotates and passes by the wheel speed sensor head; it generates a sine wave in the wheel speed sensor. The wheel speed sensor converts an analog signal to a digital square wave, and typical digital signal values switch between 7mA (Low) and 14mA (High) DC current. Recommendation/Instructions: Inspect and clean debris from the Encoder Ring. Bulletin No.: PIC5428 March, 2011 SB-10038468- Page 3 Inspection and Cleaning Procedure: Below inspection and cleaning procedure is supporting information to the SI wheel speed sensor diagnostic mechanical fault table. In most cases the DTCs C0035-C0050 with symptom bytes 18, 5A, and 0F can be repaired by removing and/or cleaning any accumulated debris on the magnetic encoder ring; which is located on the inboard side of the bearing hub. Important: Most repairs can be performed without any replacement of the bearing hub assembly or wheel speed sensor. Caution: Take care not to damage the bearing outer seal when brushing and/or cleaning the magnetic encoder debris. Caution: Do not use any type of magnetic tool to remove the debris from the bearing magnetic encoder; an external magnet can damage the encoder. BEFORE CLEANING 2596037 (1) Sample Debris 1. Based on the specific EBCM module Wheel Speed Sensor DTC code; inspect the appropriate corner magnetic encoder ring for possible debris. • C0035 Left Front Corner • C0040 Right Front Corner • C0045 Left Rear Corner • C0050 Right Rear Corner 2. If debris is found, perform the following cleaning recommendations. • 2.1. Gently using a dry nylon soft bristle brush, remove the foreign debris off the magnetic encoder ring. If debris was removed, proceed to step 3. • 2.2. If debris still remains, wash the encoder ring using a mild soap detergent and wipe dry. AFTER CLEANING Page 4 March, 2011 SB-10038468- Bulletin No.: PIC5428 2596035 3. Connect a scan tool to the vehicle. Turn ON the ignition. Clear the DTCs. 4. Perform vehicle diagnostic repair verification procedure for DTC: C0035-C0050. Refer to SI. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. SB-10038468-3620 File In Section: Bulletin No.: Date: Service Bulletin PIC5428C August, 2011 PRELIMINARY INFORMATION Subject: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message - Service Traction Message - Service Stabilitrak Message Models: 2008-2012 Buick Enclave 2008-2012 Cadillac CTS/CTS-V 2010-2012 Cadillac CTS Wagon 2011 2012 Cadillac CTS/CTS-V Coupe 2010-2012 Cadillac SRX 2009-2012 Chevrolet Traverse 2010-2012 Chevrolet Equinox 2011-2012 Chevrolet Cruze, Volt 2007-2012 GMC Acadia 2010-2012 GMC Terrain 2007-2010 Saturn Outlook 2010-2012 Buick LaCrosse 2011-2012 Buick Regal 2010-2012 Chevrolet Camaro 2011-2012 Chevrolet Camaro Convertible with any of the following DTCs or Symptom codes C0035 C0040 C0045 C0050 with symptom bytes 18 5A 0F. This PI was superseded to update model years. Please discard PIC5428B. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: A customer may comment the ABS, Service Traction Control System, and/or Service Stabilitrak telltale lights are on. During initial scan for EBCM module diagnostic codes you may find one or more of the following DTC’s C0035C0050 with specifically symptom bytes 18, 5A, 0F. This condition may be caused by single or multiple pieces of ferrous metallic debris stuck to the wheel speed sensor magnetic encoder ring. This magnetic encoder ring is now part of the inboard bearing hub assembly. Copyright 2011 General Motors. All Rights Reserved. Page 2 August, 2011 Bulletin No.: PIC5428C Background Information: 2596034 1. Wheel Speed Sensor Magnetic Encoder Ring North and South Poles are shown New Bearing Design 2596032 1. Magnetic Encoder Ring Some new model vehicles today have begun to use a different type of wheel speed sensor encoder ring or tone wheel. Instead of a traditional mechanical type tooth tone wheel, the wheel speed sensor tone wheel is now made of a magnetized nitrile rubber ring, typically brown in color. This magnetic encoder consists of multiple North and South pole pairs surrounding the outer circumference. When this magnetic encoder ring rotates and passes by the wheel speed sensor head; it generates a sign wave in the wheel speed sensor. The wheel speed sensor converts an analog signal to a digital square wave, and typical digital signal values switch between 7mA (Low) and 14mA (High) DC current. Recommendation/Instructions: Inspect and clean debris from the Encoder Ring. Bulletin No.: PIC5428C August, 2011 Page 3 Inspection and Cleaning Procedure: Below inspection and cleaning procedure is supporting information to the SI wheel speed sensor diagnostic mechanical fault table. In most cases the DTCs C0035-C0050 with symptom bytes 18, 5A, 0F can be repaired by removing and/or cleaning any accumulated debris on the magnetic encoder ring; which is located on the inboard side of the bearing hub. Important: Most repairs can be performed without any replacement of the bearing hub assembly or wheel speed sensor. Caution: Take care not to damage the bearing outer seal when brushing and/or cleaning the magnetic encoder debris. Do not use any type of magnetic tool to remove the debris from the bearing magnetic encoder; an external magnet can damage the encoder. BEFORE CLEANING 2596037 1. Sample Debris 1. Based on the specific EBCM module Wheel Speed Sensor DTC code; inspect the appropriate corner magnetic encoder ring for possible debris. • C0035 Left Front Corner • C0040 Right Front Corner • C0045 Left Rear Corner • C0050 Right Rear Corner 2. If debris is found, perform the following cleaning recommendations. Important: To properly clean the magnetic encoder ring, some applications may require removal of the bearing/hub assembly. Refer to the specific Wheel Bearing and Hub Replacement procedure in SI. 2.1. Gently using a dry nylon soft bristle brush, remove the foreign debris off the magnetic encoder ring. If debris was removed, proceed to step 3. 2.2. If debris still remains, wash the encoder ring using a mild soap detergent and wipe dry. AFTER CLEANING Page 4 August, 2011 Bulletin No.: PIC5428C 2596035 3. Connect a scan tool to the vehicle. Turn ON the ignition. Clear the DTCs. 4. Perform vehicle diagnostic repair verification procedure for DTC: C0035-C0050. Refer to SI. For vehicles repaired under warranty, use: Camaro, CTS (RWD) 0.4 hr SRX, Cruze, Volt 0.7 hr Inspect and Clean Debris From H9757 Front Wheel Speed Sensor Encoder CTS (AWD), Acadia, Enclave, Outlook, Traverse, Ring (One Side) Equinox, Terrain 1.0 hrs LaCrosse, Regal 0.9 hr Acadia (FWD), Enclave (FWD), Outlook (FWD), Traverse (FWD), SRX (FWD), LaCrosse (FWD), Regal (FWD), Equinox (FWD), Terrain (FWD) 0.4 hr Camaro, CTS, Equinox (AWD), Terrain (AWD) 0.9 hr Inspect and Clean Debris From Rear SRX (AWD) 1.1 hrs H9758 Wheel Speed Sensor Encoder Ring LaCrosse (AWD), Regal (AWD) 2.1 hrs (One Side) Acadia (AWD), Enclave (AWD), Outlook (AWD), Traverse (AWD) 1.0 hrs Volt 0.8 hr Cruze 0.6 hr *This is a unique labor operation number for PI use only. This will not be published in the Labor Time Guide. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. SB-10038468-7688 File In Section: Service Bulletin Bulletin No.: PIC5428B Date: May, 2011 PRELIMINARY INFORMATION Subject: EBCM Wheel Speed Sensor Diagnostic Aid for ABS Message - Service Traction Message - Service Stabilitrak Message Models: 2008-2011 Buick Enclave 2008-2011 Cadillac CTS/CTS-V 2010-2011 Cadillac CTS Wagon 2011 Cadillac CTS/CTS-V Coupe 2010-2011 Cadillac SRX 2009-2011 Chevrolet Traverse 2010-2011 Chevrolet Equinox 2011 Chevrolet Cruze, Volt 2007-2011 GMC Acadia 2010-2011 GMC Terrain 2007-2010 Saturn Outlook 2010-2011 Buick LaCrosse 2011 Buick Regal 2010-2011 Chevrolet Camaro 2011 Chevrolet Camaro Convertible With any of the following DTCs or Symtom codes C0035 C0040 C0045 C0050 with symptom bytes 18 5A 0F. This PI was superseded to update recommended/instructions and to include Warranty labor times. Please discard PIC5428A. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition/Concern: A customer may comment the ABS, Service Traction Control System, and/or Service Stabilitrak telltale lights are on. During initial scan for EBCM module diagnostic codes you may find one or more of the following DTC’s C0035C0050 with specifically symptom bytes 18, 5A, 0F. This condition may be caused by single or multiple pieces of ferrous metallic debris stuck to the wheel speed sensor magnetic encoder ring. This magnetic encoder ring is now part of the inboard bearing hub assembly. Background Information: Copyright 2011 General Motors. All Rights Reserved. Page 2 May, 2011 Bulletin No.: PIC5428B 2596034 1. Wheel Speed Sensor Magnetic Encoder Ring New Bearing Design.North and South Poles are shown 2596032 1. Magnetic Encoder Ring Some new model vehicles today have begun to use a different type of wheel speed sensor encoder ring or tone wheel. Instead of a traditional mechanical type tooth tone wheel, the wheel speed sensor tone wheel is now made of a magnetized nitrile rubber ring, typically brown in color. This magnetic encoder consists of multiple North and South pole pairs surrounding the outer circumference. When this magnetic encoder ring rotates and passes by the wheel speed sensor head; it generates a sign wave in the wheel speed sensor. The wheel speed sensor converts an analog signal to a digital square wave, and typical digital signal values switch between 7mA (Low) and 14mA (High) DC current. Recommendation/Instructions: Inspect and clean debris from the Encoder Ring. Inspection and Cleaning Procedure: Bulletin No.: PIC5428B May, 2011 Page 3 Below inspection and cleaning procedure is supporting information to the SI wheel speed sensor diagnostic mechanical fault table. In most cases the DTCs C0035-C0050 with symptom bytes 18, 5A, 0F can be repaired by removing and/or cleaning any accumulated debris on the magnetic encoder ring; which is located on the inboard side of the bearing hub. Important: Most repairs can be performed without any replacement of the bearing hub assembly or wheel speed sensor. Caution: Take care not to damage the bearing outer seal when brushing and/or cleaning the magnetic encoder debris. Do not use any type of magnetic tool to remove the debris from the bearing magnetic encoder; an external magnet can damage the encoder. BEFORE CLEANING 2596037 1. Sample Debris 1. Based on the specific EBCM module Wheel Speed Sensor DTC code; inspect the appropriate corner magnetic encoder ring for possible debris. − C0035 Left Front Corner − C0040 Right Front Corner − C0045 Left Rear Corner − C0050 Right Rear Corner 2. If debris is found, perform the following cleaning recommendations. Important: To properly clean the magnetic encoder ring, some applications may require removal of the bearing/hub assembly. Refer to the specific Wheel Bearing and Hub Replacement procedure in SI. 2.1. Gently using a dry nylon soft bristle brush, remove the foreign debris off the magnetic encoder ring. If debris was removed, proceed to step 3. 2.2. If debris still remains, wash the encoder ring using a mild soap detergent and wipe dry. AFTER CLEANING Page 4 May, 2011 Bulletin No.: PIC5428B 2596035 3. Connect a scan tool to the vehicle. Turn ON the ignition. Clear the DTCs. 4. Perform vehicle diagnostic repair verification procedure for DTC: C0035-C0050. Refer to SI. For vehicles repaired under warranty, use: Camaro, CTS (RWD) SRX, Cruze, Volt Inspect and Clean Debris From H9757 Front Wheel Speed Sensor Encoder CTS (AWD), Acadia, Enclave, Outlook, Traverse, Ring (One Side) Equinox, Terrain LaCrosse, Regal Acadia (FWD), Enclave (FWD), Outlook (FWD), Traverse (FWD), SRX (FWD), LaCrosse (FWD), Regal (FWD), Equinox (FWD), Terrain (FWD) Camaro, CTS, Equinox (AWD), Terrain (AWD) Inspect and Clean Debris From Rear SRX (AWD) H9758 Wheel Speed Sensor Encoder Ring LaCrosse (AWD), Regal (AWD) (One Side) Acadia (AWD), Enclave (AWD), Outlook (AWD), Traverse (AWD) Volt Cruze *This is a unique labor operation number for PI use only. This will not be published in the Labor Time 0.4 hr 0.7 hr 1.0 hrs 0.9 hr 0.4 0.9 1.1 2.1 hr hr hrs hrs 1.0 hrs 0.8 hr 0.6 hr Guide. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.