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.
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Only bulletins with component: Hybrid and electric drive are shown. Show all
| 21NA228 | 2022-06-21. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM:CHARGING:MODULE:ONBOARD (OBCM). This bulletin provides a procedure to program the BCM to correct the customers concern of RKE idle Time-out. |
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| PIP5833C | 2022-03-14. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION MOTOR:CONTROLLER:SOFTWARE; UNKNOWN OR OTHER. This Preliminary information communicates to technicians to update the program in the reductant controller |
| PIE0644A | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to their vehicle having sudden loss of propulsion. |
| PIE0644 | 2021-08-09. Service bulletin. ELECTRICAL SYSTEM:PROPULSION SYSTEM. This engineering informational bulletin is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to their vehicle having sudden loss of propulsion. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.