Incorrect Actuation of DTCS P0442, P0455 and P0456

Incorrect Actuation Of DTCs P0442, P0455 And P0456

Fault symptom
DTCs P0442, P0455 or P0456 indicated

Criteria
The DTCs indicate that the evap canister purge valve (321) is defective. Many of these valves are being replaced despite being fault free.

Procedure
To establish whether the DTCs have been actuated incorrectly, follow the instructions below.
1. Make sure the filler cap is intact and fitted tightly. The DTCs can be generated if the filler cap is loose.
2. If the system has been leak tested and there are no leaks present, do not change the evap canister purge valve.
3. Clear the DTCs and inform the customer how important it is to fit the filler cap tightly after refuelling.