Service bulletins for the 2021 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.
1649 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Brakes are shown. Show all
| PIE0615A | 2021-06-07. Service bulletin. POWER TRAIN; SERVICE BRAKES. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards on a tick and/or ping type noise heard from the Propeller Shaft during acceleration and/or braking. |
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| 21NA089 | 2021-05-24. Service bulletin. SERVICE BRAKES, AIR:DISC:CALIPER. This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris. |
| PIT5674B | 2021-05-17. Service bulletin. BACK OVER PREVENTION; SERVICE BRAKES; LANE DEPARTURE. This Preliminary information communicates that after installation of GM Accessory Performance Brake Pads it may be noticed the EBCM has set DTC(s) C116C 05 and/or C116B 05. There will be NO warning lights or messages displayed on the IPC/DIC. The GM Accessory Performance Brake Pads do not utilize the brake pad wear sensor. None. These DTC(s) do not cause any warning lights or messages to be displayed in the IPC/DIC. Per the GM Accessory Performance Brake installation instructions, the brake pad sensor connector should be capped with the supplied cap and the brake pad life system disabled in the DIC. |
| N202324120 | 2021-04-26. Service bulletin. SERVICE BRAKES. Customer Satisfaction Program. On certain vehicles may experience brake function issues over time based on feedback received from the supplier concerning the condition of certain eBoost brake unit assemblies. Dealers are to replace the eBoost brake unit assembly. |
| PIP5787A | 2021-04-19. Service bulletin. BACK OVER PREVENTION; SERVICE BRAKES. This Preliminary information communicates Some customers may comment that the SES lamp is illuminated or was Illuminated and turned off. During inspection Technician may notice DTC, P0106 (Manifold Absolute Pressure Sensor Performance), P0108 (Manifold Absolute Pressure Sensor Circuit High) and/or P00C7 (Intake Air Pressure Measurement System Sensor and Multiple Sensors Correlation) codes active or stored in history. This condition may be caused by a faulty Manifold Absolute Pressure (MAP) sensor. |
| PIP5787 | 2021-04-19. Service bulletin. SERVICE BRAKES; BACK OVER PREVENTION. This Preliminary information communicates Some customers may comment that the SES lamp is illuminated or was Illuminated and turned off. During inspection Technician may notice DTC, P0106 (Manifold Absolute Pressure Sensor Performance), P0108 (Manifold Absolute Pressure Sensor Circuit High) and/or P00C7 (Intake Air Pressure Measurement System Sensor and Multiple Sensors Correlation) codes active or stored in history. This condition may be caused by a faulty Manifold Absolute Pressure (MAP) sensor. |
| PIE0593A | 2021-03-08. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; EQUIPMENT; SERVICE BRAKES. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards the trailer brake being inoperative and/or check trailer brakes message on drivers information center (DIC). |
| 20NA020 | 2021-03-01. Service bulletin. SERVICE BRAKES. This technical bulleti provides a procedure to replace the front and rear brake pads if the brakes are squealing. |
| N202320510 | 2021-02-16. Service bulletin. LANE DEPARTURE; FUEL SYSTEM, GASOLINE; SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM; AIR BAGS; ENGINE AND ENGINE COOLING; POWER TRAIN. Customer Satisfaction Program. Certain vehicles, equipped with a gas engine, may have a condition in which the printed circuit board inside of the water pump may have been manufactured incorrectly potentially causing a water pump failure. The vehicle coolant system temperature is monitored and will display multiple warnings to the customer as coolant temperatures rise. At a set coolant temperature, the MIL will illuminate, DTC P2B85 will set in the engine control module (ECM), the oil pressure gauge will indicate high oil pressure and reduced torque with notification to the driver of reduced power will occur. If the customer continues to drive after this warning and the coolant temperature continues to rise, a chime will occur, the AC will be disabled and an additional message instructing the driver to idle will illuminate. If the customer continues to drive the vehicle after all previous warnings and the coolant temperature continues to rise a message the engine will shut down could occur, and the engine will be shut down. Dealers are to replace the water pump. |
| 19NA136 | 2021-02-01. Service bulletin. PARKING BRAKE; EQUIPMENT; POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE). 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. |
| PIE0596 | 2020-12-07. Service bulletin. SERVICE BRAKES. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to the ABS or the traction control message illuminated in the Drivers Information Center (DIC). |
| PIP5753 | 2020-10-19. Service bulletin. WHEELS; PARKING BRAKE. PIP5753 created to advise the technician to inspect for loose bolts on the turbocharger if there is a performance issue and code set. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.