Service bulletins for the 2020 GMC Sierra
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
1990 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
| 99-04-20-002O | 2024-07-30. Service bulletin. POWER TRAIN. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation. |
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| 24-NA-124 | 2024-07-26. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This technical bulletin provides repair information to correct a customer concern of Malfunction Indicator Lamp Illuminated, Stall, or No Start with DTC P2534, U3023, P0700, P129D, P10DB (w/ L5P Diesel), P103B, P17E0. |
| 19-NA-129 | 2024-07-24. Service bulletin. SUSPENSION. This technical bulletin provides repair information to correct a customer concern of a squeak and/or clunking noise coming from the rear of the vehicle. |
| 16-NA-019 | 2024-07-23. Service bulletin. POWER TRAIN. This service bulletin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flares. |
| 21-NA-089 | 2024-07-22. Service bulletin. SERVICE BRAKES. This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris. |
| 23-NA-002 | 2024-07-22. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This technical bulletin provides repair information to correct a customer concern of Charge Air Cooler (CAC) Icing, Check Engine Lamp Illuminated, Possible P0299, P2227, and/or P0300 DTCs Set. |
| 20-NA-022 | 2024-07-20. Service bulletin. SUSPENSION. This technical bulletin provides a procedure to re-torque the leaf spring u bolts to correct a condition of Clunking Noise from Rear of Vehicle (Re-torque Leaf Spring Bolts). |
| 24-NA-123 | 2024-07-18. Service bulletin. ENGINE. This service bulletin advises the technician that the purge pump part number has changed and limited supply. |
| 16-NA-383 | 2024-07-16. Service bulletin. ENGINE; FUEL/PROPULSION SYSTEM. This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up. |
| 04-06-04-051I | 2024-07-16. Service bulletin. FUEL/PROPULSION SYSTEM. This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive. |
| 22-NA-070 | 2024-07-12. Service bulletin. UNKNOWN OR OTHER. This service bulletin provides information for replacement parts traceability (RPT) process to aid in tracking part replacements. |
| 22-NA-018 | 2024-07-12. Service bulletin. UNKNOWN OR OTHER. This service bulletin provides information for the Global Warranty Management (GWM) Warranty Parts Center (WPC) Part Photo Return Process (U.S. Dealers Only). |
| 18-NA-099 | 2024-07-12. Service bulletin. UNKNOWN OR OTHER. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim. |
| 19-NA-218 | 2024-06-28. Service bulletin. ENGINE. This service bulletin provides a service procedure to correct a condition of a Ticking Noise from the Engine. |
| 18-NA-125 | 2024-06-28. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This service bulletin provides information for engine oil life monitor operation calculation. |
| 24-NA-098 | 2024-06-25. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E4403, M4404, M4413, M6954, M6955, E4414, E4423, E4491, E4492, or E6961 and resolution information. |
| 21-NA-068 | 2024-06-22. Service bulletin. UNKNOWN OR OTHER; ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information requirements applicable to key fob replacement under the New Vehicle Limited Warranty or under a Replacement Parts Warranty on 2017-2022 and newer model year vehicles with RPO ATH and AVJ. |
| 20-NA-016 | 2024-06-22. Service bulletin. UNKNOWN OR OTHER. This Warranty Administration bulletin provides information on customer vehicles concern results in a manufacturer repurchase from the customer, GM depends on the dealership to host and administer the repurchase closing and intake of the returning vehicle. |
| 23-NA-032 | 2024-06-18. Service bulletin. ENGINE; ELECTRICAL SYSTEM. The informational bulletin advises the tech to use the glow plug bore cleaner to reduce the chance of soot building up on the glow plug causing a premature failure. |
| 21-NA-238 | 2024-06-18. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure to inspect the front pump of the transmission for a possible leak. |
| 19-NA-129 | 2024-06-18. Service bulletin. SUSPENSION. This technical bulletin provides repair information to correct a customer concern of a squeak and/or clunking noise coming from the rear of the vehicle. |
| 23-NA-142 | 2024-06-18. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure for the techs to replace the forward check ball and separator plate if found the cause of the customers concern of No Forward Gear When Shifting from Park to Drive and/or Reverse to Drive. |
| 10-03-10-001G | 2024-06-18. Service bulletin. WHEELS; SUSPENSION. This informational bulletin provides information on Wheel Balancer Mounting Instructions. |
| 23-NA-064 | 2024-06-10. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Battery stand time of the vehicle during transit and or long period of stand time at the dealerships. |
| 19-NA-136 | 2024-06-08. Service bulletin. POWER TRAIN. This service bulletin provides a diagnostic procedure to aid in correcting a customer concern of a Howling, Whining/Whirring Noise, Shudder/Vibration and/or Grinding Noise While in 4HI, 4HI Auto and/or During Parking Lot Maneuvers in Auto Mode. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.