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.

Ignition - On / Vehicle - In Service Mode
Verify no other DTCs are set.
- If other DTCs are set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If no other DTCs are set
Ignition - Cycle Off and On
Verify a click can be heard or felt at the component when the scan tool control function was commanded: KR75 Engine Controls Ignition Relay
- If a click cannot be heard or felt
  Refer to: DTC P0685-P0687, P0689, P0690, P1682, P16A7, P16AF, or P16B3
- Go to next step: If a click can be heard or felt
Replace the component: K20 Engine Control Module
Verify the DTC does not set.
- If the DTC sets
  Refer to: Diagnostic Aids
- Go to next step: If no DTC is set
All OK.