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 DTC P0602, P0630, P160A, P160D, P160E, P161C, P264F is not set.
- If the DTC is set
1. Perform all necessary programming and setup procedures for the control module: K20 Engine Control Module
2. Verify the DTC does not set.
  - If the DTC sets - Replace the component: K20 Engine Control Module
  - Go to next step: If the DTC does not set
3. All OK.
- Go to next step: If the DTC is not set
Verify DTC P0605, P0607, P060A, P060B, P0610, P061C, P064D, P064E, P134C, P163A, P163B, P2610, P27B5 is not set.
- If the DTC is set
  Replace the component: K20 Engine Control Module
- Go to next step: If the DTC is not set
Verify DTC P0685 - P0690, P1682, P16A7, P16AF, P16B3, P16BC, P16BD, P16BF is not set.
- If the DTC is set
  Refer to: Diagnostic Trouble Code (DTC) List - Vehicle
- Go to next step: If the DTC is not set
Verify DTC P0601, P0603, P0604, P0606, P062B, P062F, P16F3, P262B is not set.
- If the DTC is set
1. Ignition - On / Vehicle - In Service Mode
2. Verify the scan tool parameter: Battery Voltage = The value should not spike or drop out.
  Perform the action while monitoring the parameter:
  - Wiggle the harness and connector: K20 Engine Control Module
  - Wiggle the harness and connector: X50A Fuse Block - Underhood
  - If the value spikes or drops out - Repair as necessary - B+ circuit or Ground
  - If the value does not spike or drop out - Replace the component: K20 Engine Control Module
- Go to next step: If the DTC is not set
All OK.