GMC Envoy: Powertrain

Affects GMC Envoy · 2002 — about 5K vehicles.

The hazard

Certain (4 wheel-drive) Trailblazer and GMC Envoy vehicle. The calibration of the active transfer case control module may cause insufficient high speed gear engagement. If the gear is not engaged, the vehicle can roll when the transmission is in "park" and a crash could result without warning. Correction: dealers are to reprogram the active transfer case control module (ATCM) calibration to increase gear engagement.

What to do

Contact your dealer; the remedy details were not included in the filing.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational