Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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+ circuitorGround
  - 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.