DTC P0401: EGR System
- Inspect air cleaner for damage, dirt, or debris. If air cleaner is okay, go to next step. Service air cleaner as necessary.
- Connect and operate scan tester, following manufacturer's instructions. Test-drive vehicle with no electrical load, with A/T in D4 position. Accelerate gradually from 50 MPH for at least 8 seconds. Retrieve codes. If DTC P0401 appears, go to next step. If DTC P0401 does not appear, failure was intermittent, but does not exist at this time.
- Clean intake manifold EGR port with carburetor cleaner. Clean passage inside EGR valve with carburetor cleaner, or replace EGR valve as necessary.