Rypkr937
Well-Known Member
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I had another thread about a misfire but it got taken over with other peoples issues. I've also further narrowed mine down so to seemingly be caused by the AC.
Background. Stock 2015 gt. AC compressor clutch seized and took it to dealer. They replaced the whole compressor. Shortly after <100 miles I got a CEL. Autozone scanner said p0300 and 6 other specific cylinder misfires logged. Never flashed. Hoped it was bad gas. Sure enough cleared after next fill up. Came back on shortly there after (maybe within the next 100 miles) and also flashed. AC was running during these occurrences.
Bought a cheap OBD2 scanner to read the codes and it showed p0300 again. Cleared it and started researching. In the meantime since its been cool, and me being suspicious it still had something to do with the AC compreasor replacement I chose to not use the AC the last month.
In 300 miles the code never came back and the OBD2 scanner never showed a pending code. I was ready to try the AC again. Sure enough within 5 miles of the AC being on the OBD2 scanner showed a pending p0300 code. I turned off the AC and didn't let it set because I need an inspection and can't have a code. Sure enough, about 25 miles later with no AC the pending code went away as well.
Here's the other suspicious thing its doing. When its idling if I have the climate set to "auto" with the AC NOT ON. The AC compreasor cycles CONSTANTLY. It engages and disengaged the compreasor probably every 15-20 seconds. I'm not sure the compressor should be engaging at all in auto if i don't have the "AC" button on, should it? And even if it should, it definitely shouldn't be short cycling.
AC blew cold yesterday when I ran it FWIW.
Could this be as simple as the PCM needing reprogrammed after the compessor replacement last month?
Any smart people on here have ideas of what to investigate given these specific symptoms?
Background. Stock 2015 gt. AC compressor clutch seized and took it to dealer. They replaced the whole compressor. Shortly after <100 miles I got a CEL. Autozone scanner said p0300 and 6 other specific cylinder misfires logged. Never flashed. Hoped it was bad gas. Sure enough cleared after next fill up. Came back on shortly there after (maybe within the next 100 miles) and also flashed. AC was running during these occurrences.
Bought a cheap OBD2 scanner to read the codes and it showed p0300 again. Cleared it and started researching. In the meantime since its been cool, and me being suspicious it still had something to do with the AC compreasor replacement I chose to not use the AC the last month.
In 300 miles the code never came back and the OBD2 scanner never showed a pending code. I was ready to try the AC again. Sure enough within 5 miles of the AC being on the OBD2 scanner showed a pending p0300 code. I turned off the AC and didn't let it set because I need an inspection and can't have a code. Sure enough, about 25 miles later with no AC the pending code went away as well.
Here's the other suspicious thing its doing. When its idling if I have the climate set to "auto" with the AC NOT ON. The AC compreasor cycles CONSTANTLY. It engages and disengaged the compreasor probably every 15-20 seconds. I'm not sure the compressor should be engaging at all in auto if i don't have the "AC" button on, should it? And even if it should, it definitely shouldn't be short cycling.
AC blew cold yesterday when I ran it FWIW.
Could this be as simple as the PCM needing reprogrammed after the compessor replacement last month?
Any smart people on here have ideas of what to investigate given these specific symptoms?
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