1998 GMC Yukon P0440 EVAP Code

1998 GMC YUKON
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NATE R.
  • MEMBER
  • 1 POST
I am getting a trouble code p0440 and p0440pd, I look in the reference code book for the description but it just says evap emission control system malfunction. I am new to the mechanical realm, so I do not know what might be the problem or what in the evap system to check or repair?
Jun 26, 2006 at 10:18 AM
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MIKEYBDMAN
  • ✓Experienced Mechanic
  • 623 POSTS
In looking at the test procedure for your code, it looks like it could be any number of things in your EVAP system.
I would check your "Eng 1 Fuse 15" 20a fuse in the underhood fuse-relay center, and maybe check the connectors for the Evaporative Emission Cansiter Purge Vale, Evaporative Emission Canister vent, Vehicle Control Module, and EGR and map sensors, and hopefully it is just a loose plug.
Other than that, you are probably going to have to take it to a shop to get it diagnosed.
Jul 9, 2006 at 12:43 PM
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Suggested Repair

Check the Eng 1 Fuse 15 20A fuse in the underhood fuse-relay center and inspect the connectors for the EVAP canister purge valve, EVAP canister vent, vehicle control module, EGR sensor, and MAP sensor for a loose connection. If those checks do not find the fault, have a shop diagnose the EVAP system.

Conversation Summary

The owner of a 1998 GMC Yukon reports codes P0440 and P0440PD, described only as an EVAP emission control system malfunction, and asks what to check. The expert says several EVAP components could be involved, recommends checking the Eng 1 20A fuse and the connectors at the purge valve, canister vent, vehicle control module, EGR, and MAP sensors, and otherwise taking the vehicle to a shop for diagnosis.

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