Question about 2008 Chevrolet Impala

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Code large air leak (emmission light stays on)

Code - large air leak (emmission light stays on) Bought new gas cap - didn't make a difference. any suggestions?

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You need the code
Then you find the problem in the EVAP System
An EVAP Smoke Machine, would have you making the repair in about 3 minutes.
So unless you can find a loose hose,broken fitting Etc,you need professional help.
Then the job is completed with a scanner to test system, I doubt your spending 8 thousand for that piece of test equip.
Now you know why cars cost a lot to fix.

Posted on May 12, 2010

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Hi, I have a scanner cause engine light is on, shows vacuum leak large. tried new gas cap, cleaned filler tube where gas cap contacts, replaced a plastic tube from valve cover to air filter hose. tried to...


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I have a 2003 dodge ram 1500 with a V-8 4.7 engine and my check engine light came on with a P0456 code and I have been told that it could be the gas cap, I have checked it and it seems fine but should I...


The leak in your evap system is very small at .020. It is more than likely a small split in a hose somewhere. The cap is probably ok, we rarely find a bad one. If it is a small split in a hose it will only get larger over time. Here is the factory info on the code. We have found that alot of these leaks are from a small hose on the evap canister under the vehicle, but with out looking at your vehicle it is hard to say. If the leak goes away or is no longer large enough to be detected, your light will go out after a few days. These leaks are emmissions related and will not effect the integrity of the vehicle. I would have it checked and corrected if the light stays on at your convienience.

Symptom List:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0442-EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
When Monitored and Set Condition:
P0442-EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: If there is a leak larger than 0.0409 and smaller than 0.0809 in the
evaporative system.
P0455-EVAP LEAK MONITOR LARGE LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0809 in the evaporative system.
P0456-EVAP LEAK MONITOR SMALL (.020) LEAK DETECTED
When Monitored: Immediately after a cold start, with battery/ambient temperature
between 40° F and 90° F and coolant temperature within 10° F of battery/ambient.
Set Condition: There is a leak larger than 0.0209 and smaller than 0.0409 in the
evaporative system.
POSSIBLE CAUSES
LEAK AT GAS CAP
VEHICLE HISTORY AND SERVICE BULLETIN INVESTIGATION
VISUAL AND PHYSICAL INSPECTION
VERIFY EVAPORATIVE EMISSION SYSTEM LEAK
EVAP PURGE SOLENOID OPERATION
INTERMITTENT LDP MONITOR FAILURE
EVAPORATIVE EMISSION LEAK DETECTION
GAS CAP
LDP COMPONENT LEAK

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Engine light stays on. Code P0455 shows up. Had bought a new gas cap as the old one was worn out.


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Dashboard


I'm not a mechanic but I've had this problem with a dodge truck and a Saturn. I bought a new gas cap and the problem stopped. It takes awhile after you install the new cap for the emmission control system to clear. Something about air gas mix. I don't know about the Trac problem.

Aug 24, 2008 | 2002 Oldsmobile Alero

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