Summary of Service Update 18348
This service update is for 2019 Cadillac XT4 vehicles that may experience a stuck shifter in park with DTC P189D. The vehicle’s speed must be below 6 mph (10 km/h) to go into Neutral and below 3 mph (5 km/h) to go into Park.
The correction involves reprogramming the engine control module (ECM) with updated software and calibration. No parts are required for this repair.
Important Notes
Dealers must check the Investigate Vehicle History screen in the GM Global Warranty Management system to confirm vehicle involvement before performing any inspections or repairs.
Stable battery voltage is critical during programming, and care must be taken to avoid interruptions.
This service update is only applicable to vehicles still under warranty.
Manual:
Download: Service Update 18348 Shifter Stuck in Park with DTC P189D for 2019 Cadillac XT4
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