DTC Troubleshooting: P0451
DTC P0451: EVAP Leak Check Module Pressure Sensor Range/Performance
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P24BA or P24BB is stored at the same time as DTC P0451, troubleshoot DTC P24BA or P24BB first, then recheck for DTC P0451.

DTC Description
Confirmed DTC
Pending DTC
P0451 EVAP Leak Check Module Pressure Sensor Range/Performance
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine, and let it idle for 1 minute.

?4.
Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0451 EVAP Leak Check Module Pressure Sensor Range/Performance
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Replace the EVAP leak check module.?
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the EVAP leak check module and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?