CEL code P050D
Thread Starter
Instructor
Joined: Mar 2016
Posts: 121
Likes: 30
From: Ridgefield CT
CEL code P050D
I have a CEL P050D code pop up on the car over the past couple of weeks and checking with Onstar they tell me that the code shows "Ignore unknown DTC".
I took the car to the dealer over the weekend to have them check it out and they told me that the history showed a "Rough idle" code and that it may need to have the heads off to clean up excessive coking. They reset the code but it came up again this morning.
The car has around 9500 miles since May 2016 and I had the BMS air filter and a Corsa X-pipe added about 2000 miles ago.
The dealer says that the de-coke would be covered under warranty, but I was curious if anyone else had seen this.
I took the car to the dealer over the weekend to have them check it out and they told me that the history showed a "Rough idle" code and that it may need to have the heads off to clean up excessive coking. They reset the code but it came up again this morning.
The car has around 9500 miles since May 2016 and I had the BMS air filter and a Corsa X-pipe added about 2000 miles ago.
The dealer says that the de-coke would be covered under warranty, but I was curious if anyone else had seen this.
Melting Slicks
Joined: Feb 2006
Posts: 3,271
Likes: 182
From: Manassas VA
Melting Slicks
Joined: Aug 2016
Posts: 2,448
Likes: 160
From: JARRELL TEXAS
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
You have gotten a couple of good avenues of investigation from the forum and let me add one more... Stay the HELL away from the dealer who wants to pull the heads because of coking and take it to a dealer with a competent service department.
Melting Slicks
Joined: Oct 2007
Posts: 2,398
Likes: 858
I have a CEL P050D code pop up on the car over the past couple of weeks and checking with Onstar they tell me that the code shows "Ignore unknown DTC".
I took the car to the dealer over the weekend to have them check it out and they told me that the history showed a "Rough idle" code and that it may need to have the heads off to clean up excessive coking. They reset the code but it came up again this morning.
The car has around 9500 miles since May 2016 and I had the BMS air filter and a Corsa X-pipe added about 2000 miles ago.
The dealer says that the de-coke would be covered under warranty, but I was curious if anyone else had seen this.
I took the car to the dealer over the weekend to have them check it out and they told me that the history showed a "Rough idle" code and that it may need to have the heads off to clean up excessive coking. They reset the code but it came up again this morning.
The car has around 9500 miles since May 2016 and I had the BMS air filter and a Corsa X-pipe added about 2000 miles ago.
The dealer says that the de-coke would be covered under warranty, but I was curious if anyone else had seen this.
Under no circumstances should you allow them to remove those heads for this issue unless you have a P0 300 code as well.
Absolutely no way your heads are coked in 9500 miles using Mobil 1 as the factory fill unless you are burning huge amounts of oil. It would take much more than 1 quart per 3000 miles to even bring this into question. An amount of oil consumption that would be blatantly obvious.
This code can come from a fouled plug that could have cleared itself (or still be fouled) or may be breaking down slightly when the car is really hot. Or fuel with to high a water content.
Recommend getting GM corporate reps involved before allowing those heads to come off the car!!!!
Last edited by dar02081961; Aug 4, 2017 at 03:49 PM.
Thread Starter
Instructor
Joined: Mar 2016
Posts: 121
Likes: 30
From: Ridgefield CT
Thanks to all for the advice and guidance. Spoke to the dealer and showed them the service bulletin and they identified injector #4 was faulty. Replaced and the car seems fine now.
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