22-NA-015
Service Bulletin Details
Public Details for: 22-NA-015
This informational bulletin provides graphs to help identify possible issues that may cause shaking and shudders and what may be the cause of said issue.
Models from 2023
2023 CADILLAC ESCALADE |
2023 CADILLAC ESCALADE ESV |
2023 CHEVROLET SILVERADO 1500 |
2023 CHEVROLET SUBURBAN |
2023 CHEVROLET TAHOE |
2023 GMC SIERRA 1500 |
2023 GMC YUKON |
2023 GMC YUKON XL |
Models from 2022
Models from 2021
Models from 2020
2020 CHEVROLET SILVERADO 1500 |
2020 GMC SIERRA 1500 |
Bulletin No.: Service Bulletin Date: 22-NA-015 February, 2023 INFORMATION Subject: Diagnostic Tips on GDS Graphing after Road-Test, for Shake and/or Shudder During Steady and/or Light Throttle Acceleration Between 25 and 50 MPH (40 and 80 KM/H) at Steady Speed, and Decel at approximately 15 MPH (24 KM/H). Brand: Model: Cadillac to Escalade Models 2021 2023 Silverado 1500 2020 2021 2022 2022 Silverado 1500 LTD (RPO J21, VIN Digit 5 = W / Y) Chevrolet Silverado 1500 New (RPO J22, VIN Digit 5 = A / D) Silverado 1500 Suburban Tahoe Sierra 1500 Sierra 1500 Limited (RPO J21, VIN Digit 5 = 8 / 9) GMC Model Year: from Sierra 1500 New (RPO J22, VIN Digit 5 = H / U) VIN: from to Engine: Transmission: L84, L87 MQB, MQC, MHS, MHO, MHT, MI2 2023 2021 2023 2020 2021 2022 2022 Sierra 1500 2023 Yukon Models 2021 2023 Involved Region or Country North America, Australia, New Zealand, Europe, Uzbekistan, Middle East, Israel, Argentina (Mercosur), Brazil (Mercosur), Bolivia (West), Chile (West), Colombia (West), Ecuador (West), Paraguay (West), Peru (West), Uruguay (West) Condition Some customers may comment of a shudder, shake, vibration from approximately 25 – 50 mph (40-80 km/h) while under steady to lightly accelerating throttle. Cause This condition may be caused by various transmission and engine concerns. See the Diagnostic Tips below. – Check for Transmission and Engine related DTC’s. Resolve any DTC’s before and reevaluate the vehicle before proceeding. Correction Diagnostic Tips Test Drive The customers vehicle should be test driven in an effort to duplicate the condition. Details of vehicle speed, driving conditions and throttle input may need to be discussed with the customer. Some normal shudder, shake, vibration or growl can be expected in low speed, light throttle applications as the vehicle may be going in and out for Dynamic Fuel Management (DFM). DFM can be turned off for a test drive by shifting the transmission into Manual Range “L9”. Driving a like vehicle under the same conditions may help determine if the vehicle is operating like other vehicles and should be considered characteristic of design. Copyright 2023 General Motors LLC. All Rights Reserved. Page 2 February, 2023 Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. Bulletin No.: 22-NA-015 Diagnostic Tip Engine Related Shudder – 22– NA–080 Camshaft Actuator Diagnostic Tips Engine Performance ⇒ Diagnostic Tip Related Shudder: 21–NA-207 5975002 5975000 1. Engine Speed 2. Engine Torque 3. Vibration Felt after Engine Refuel, Should be in Reduced Firing Fraction 4. Pedal 5. Transmission Input Shaft Speed (ISS) Diagnostic Tip Closed Throttle Shudder – TSB 21-NA-207: 2021 Silverado Sierra 5.3 (L84) 10 Speed (MQB) only. The condition is only present at 0% throttle during a coast event at approximately 15 mph (24 km/h). Note the engine RPM and torque oscillations at engine refuel points. 1. Torque 2. Engine Speed 3. Transmission ISS 4. Pedal Record a GDS session log and monitor engine speed, transmission input speed and engine torque. If engine torque is larger than +- 25 Nm while no gear shift is active, and throttle is relatively constant the issue most likely lies within the engine. Observe the large variation in engine torque while engine speed and Transmission ISS follow each other more closely. Although this feels like shudder to the customer it is most likely an engine related concern. Bulletin No.: 22-NA-015 February, 2023 Diagnostic Tips TCC Solenoid – Valve Body Page 3 3. Transmission ISS 4. TCC Pressure • Shudder condition is present in Drive “D” but NOT present in Manual “L9” • Throttle would typically be less than 10% and engine torque less than 100 Nm • TCC slip speed will be 0 or near 0 • TCC pressure command will remain at 100 kPa The valve body should be replaced. Diagnostic Tip TCC Shudder – Torque Converter Note: This data should only be collected when driving the vehicle in manual 9th gear so dynamic fuel management is disabled. 5975003 1. 2. 3. • Torque Engine Speed Transmission ISS The shudder condition is present both in Drive “D” or Manual “L9”. • Typically occurs at less than 15,000 miles (24,000 km) • Transmission ISS follows engine speed • Relatively consistent engine torque. <+- 25 Nm Engine torque remains relatively flat while engine speed rises and falls. The valve body should be replaced. Diagnostic Tip TCC Solenoid (Drift) – Valve Body 5975007 Note: A slight vibration that can only be felt when dynamic fuel management is active should be deemed normal characteristic and engine and transmission components should not be replaced. 1. 2. 3. 4. • • • Torque Engine Speed Transmission ISS Pedal TCC pressure control is steady TCC slip is elevated Engine RPM will increase at the shudder point while Transmission ISS remains steady • Engine torque remains relatively steady during the shudder event • Throttle angle remains steady during the shudder event 5975005 1. Torque 2. Engine Speed Page 4 February, 2023 Bulletin No.: 22-NA-015 The torque converter should be replaced. Note: Warranty claim reviews indicate that when the torque converter is replaced for shudder that vehicle often returns for additional engine or transmission repairs. In most cases the torque converter is not the cause of the shudder. Diagnostic Tip Engine Related Shudder - Fuel Injectors 6124137 1. 2. 3. 4. • • • Torque Engine Speed Transmission ISS TPS Engine RPM is erratic Throttle is fairly steady/constant Magnitude of RPM and TPS signal is relatively small • Engine RPM will not be in sinewave pattern. The issue is possibly related to one or more fuel injector. Version 3 Modified Released January 27, 2022 Revised March 21, 2022 - Revised Subject, Added Additional Countries, Change Turbine Speed to Transmission Input Shaft Speed. Revised July 21, 2022 - Added Two Notes to the Diagnostic Tip TCC Shudder – Torque Converter section and Removed PIP5794 and Added 22–NA-080, added Important Statement and Added Fuel Injection section. Revised January 26, 2023 - Added 2023 to Model Year and Added M12, MHO and MHT to Transmission RPO section. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION