Service bulletins for the 2018 GMC Terrain
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.
1345 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Turn signals are shown. Show all
| 17427 | 2021-04-30. Service bulletin. ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL; EXTERIOR LIGHTING:TURN SIGNAL; ELECTRICAL SYSTEM:SOFTWARE. Condition Certain 2018 model year GMC Terrain vehicles equipped with a trailer package (RPO V92) may have a trailer turn signal and brake lamp that is inoperative on a connected trailer due to an incorrect calibration. Correction Dealers are to reprogram the body control module. |
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| 18NA032 | 2018-05-21. Service bulletin. ELECTRICAL SYSTEM; EXTERIOR LIGHTING:TURN SIGNAL:SWITCH. This technical bulletin provides a procedure to replace the turn signal switch with the correct one due to the wrong one being installed at the plant. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.