PCM 442 Code?
Thread Starter
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 361
From: Midland TX
PCM 442 Code?
I was idling at a red light tonight and got my first Check Engine Light. Pulled over, opened the hood and engine was still there. So I ran codes and it showed PCM - 442 H C. I cleared the code and it has not returned yet throughout 3 restarts so far.
Any idea what is getting ready to blow up?
Any idea what is getting ready to blow up?
Drifting
Joined: May 2010
Posts: 1,482
Likes: 2
From: Pearland, TX
Thread Starter
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 361
From: Midland TX
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
Before your try/replace anything else, pull the driver's side fuel rail cover and follow your evap line until you find a small green cap. Make sure that cap is screwed on tightly. I've seen that cap come loose over time on two different C5's and that will give you a small evap leak...
Also, make sure you tighten your gas cap until it clicks several times after filling up.
Also, make sure you tighten your gas cap until it clicks several times after filling up.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Very common code---P0442 ia a "small" evap leak----99% of the time it'sjust the gas cap--either it was not put on squarely---OR it has started to leak internally---The "H" on your code means History--which means it's an old code----clear it and check the cap instalation---If it re-apears get a new cap---BUT don't get a cheapie fram or O-rielly one--get a GM cap as the aftermarkets are generally a "one size fits all" and don't seal well either---
Thread Starter
Le Mans Master
Joined: May 2006
Posts: 6,774
Likes: 361
From: Midland TX
Will do.
Burning Brakes
Joined: Feb 2005
Posts: 838
Likes: 0
From: Illinois/Ca
I've had that code happen twice since I purchased my car.
First time - gas cap has to be replaced.
About 3 yrs and 1600 miles later had it happen a 2nd time -
"vent solenoid" had to be replaced this time. Around $200 at my local dealer.
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