20NA209
Service Bulletin Details
Public Details for: 20NA209
Models from 2020
2020 CHEVROLET SILVERADO 2500 |
2020 GMC SIERRA 2500 |
Models from 2019
2019 CHEVROLET SILVERADO 2500 |
2019 GMC SIERRA 2500 |
Bulletin No.: Service Bulletin Date: 20-NA-209 October, 2020 TECHNICAL Subject: Service 4WD Message Illuminated on Driver Information Center (DIC), DTCs C118D, C119B and/or C119C Set Brand: Model: Chevrolet GMC Model Year: from to Silverado 2500HD/ 3500HD 2019 2020 Sierra 2500HD/ 3500HD 2019 2020 Involved Region or Country VIN: from Engine: Transmission: All All to North America, Israel, Saudi Arabia, Chile Additional Options (RPOs) Condition Some customers may comment on seeing a Service 4WD message illuminated in the DIC, Technicians may find DTCs C118D, C119B and/or C119C Set. Cause The cause of the condition may be water intrusion and corrosion within the front differential actuator connector and the electrical harness connector terminals. Correction 5660054 Scan for DTCs and verify if C118D, C119B, and / or C119C are present. If any of the listed DTCs are present, inspect the front drive axle actuator electrical connector for signs of moisture, corrosion at the pins, or damage to the actuator housing. Note: Examples of damage to the actuator housing and the harness connector seal, are shown at the start of the Service Procedure below. Also inspect the electrical wire harness connector for any damage to the internal seal or signs of moisture and corrosion. If any of the listed conditions such as moisture, corrosion, or damage are present on either component, replace BOTH the front drive axle actuator and the electrical wiring harness that connects to the actuator. Copyright 2020 General Motors LLC. All Rights Reserved. Page 2 October, 2020 Bulletin No.: 20-NA-209 Service Procedure 5660055 Electrical Harness Connector Seal Damage 5660056 Front Drive Axle Actuator Housing Damage Bulletin No.: 20-NA-209 October, 2020 Page 3 5233270 Page 4 October, 2020 Bulletin No.: 20-NA-209 1. Remove the left front tire and wheel assembly, and the left front wheelhouse liner (3). Refer to Front Wheelhouse Liner Replacement, in SI. 5334967 2. Remove the underbody skid shield and the front drive axle actuator (1). Refer to Front Drive Axle Actuator Replacement, in SI. 5660058 Bulletin No.: 20-NA-209 October, 2020 Page 5 3. Working from the lowest point upward, remove the front drive axle actuator harness assembly. Note the harness routing and original location of the retainers and disconnect the retainer adjacent to the shock mount last. 5660059 Note: There are seven retainers that secure the harness to the vehicle. 4. Connect the retainer adjacent to the shock mount first, then route and install the new front drive axle actuator harness. Page 6 October, 2020 Bulletin No.: 20-NA-209 5334967 5. Install the new front drive axle actuator (1) and reinstall the underbody skid shield. Refer to Front Drive Axle Actuator Replacement, in SI. Bulletin No.: 20-NA-209 October, 2020 Page 7 5233270 6. Reinstall the left front wheelhouse liner (3) and the left front tire and wheel assembly. Refer to Front Wheelhouse Liner Replacement, in SI. 7. Remove the support and lower the vehicle. Parts Information Causal Part Description Part Number Qty X ACTUATOR ASM-FRT DRV AXLE 84756932 1 X HARNESS ASM-TRFER CASE SEL SHFT CONT SW W 84801336 1 Warranty Information For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle History (IVH) for coverage information. Labor Operation Description Labor Time 3087168* Front Drive Axle Actuator and Electrical Harness Replacement 1.3 hr. *This is a unique Labor Operation for Bulletin use only. Version 1 Modified Released October 23, 2020 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