View Full Version : I got a CEL Code PO456. Any suggestions?


BigWillieStyle
03-22-2008, 06:03 AM
I am looking for some suggestions from anyone who has received the CEL code before.

:banghead: I went and had the code read and here is what the print out said...

Definition: EVAP small leak detected.

Explanation: The ECM has detedted a large leak in the EVAP system during a system monitor test.

Problem Causes:

1. Defective, loose or missing fuel cap.

2. EVAP canister broke, hose cracked or not connected.

3. Purge or vent solenoid defective.

4. Vacuum leak at engine.

:banghead:

Again any suggestions, ideas or help would be greatly appreciated!! Thanks All!!

StealthTL
03-22-2008, 06:25 AM
You left your gas cap loose for two fill-ups.

Crank it till it clicks.

Dont worry, you are probably on an old version of the flash software for the computer - newer versions decrease the sensitivity for this alarm.


S

BigWillieStyle
03-22-2008, 04:34 PM
I didn't think it was my gas cap, because I hadn't gotten a fuel fill up in about a week. Also, the gas cap was the first thing I checked and it was tight.

Do you think I may need to get the gas cap replaced? Or do you think I should get the comp a new flash?

Thanks Guys!

VOODOO8
03-23-2008, 10:09 AM
I didn't think it was my gas cap, because I hadn't gotten a fuel fill up in about a week. Also, the gas cap was the first thing I checked and it was tight.

Do you think I may need to get the gas cap replaced? Or do you think I should get the comp a new flash?

Thanks Guys!

In the absence of any other type of guidance, starting a diagnostic loop with the cheapest thing that might need to get fixed and working your way up from there is usually a sound procedure to follow.:)

expo1
03-23-2008, 10:14 AM
Get a new gas cap, Stant part #10838. Fixes this issue almost all the time.