Circuit/System Verification
- If DTC P0641 or P0651 is also set, correct DTC P0641 or P0651 first.
- Inspect for the following conditions:
- Disconnected, damaged, or incorrectly routed vacuum hoses
- Manifold absolute pressure (MAP) sensor disconnected from the vacuum source
- Restrictions in the MAP sensor vacuum source
- Intake manifold vacuum leaks
- Check for a properly functioning oxygen sensor. Refer to Scan Tool Data List