Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

This procedure is required when the following component has been repaired, replaced, removed, or serviced:

Control Valve Body
K71 Transmission Control Module
T12 Automatic Transmission Assembly
Q77 Transmission Control Solenoid Valve

Ignition - On / Vehicle - In Service Mode
Verify DTC P27A7, P27A8, P27A9, P27AA, P27AB, P27AC, P27AD, P27AE is not set.
- If any of the DTCs are set
  Refer to: Solenoid Valve Characterization Reprogramming
- Go to next step: If no DTC is set
All OK.