LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Car throwing random dtc codes

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Old Jul 4, 2020 | 05:18 PM
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ss27gogeta's Avatar
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Default Car throwing random dtc codes

Car is a 95 ta im useing scan 94-95 to scan for dtc's and have noticed when I watch the dtc screen a random code will appear for like half a second. then disappear then a minute or so later it will do it again but a different code. is this a sign my pcm is on its way out or is this normal. the only codes I have left that stay are the egr air pump and ac codes becouse they have been deleted.
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Old Jul 5, 2020 | 01:06 AM
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Originally Posted by ss27gogeta
Car is a 95 ta im useing scan 94-95 to scan for dtc's and have noticed when I watch the dtc screen a random code will appear for like half a second. then disappear then a minute or so later it will do it again but a different code. is this a sign my pcm is on its way out or is this normal. the only codes I have left that stay are the egr air pump and ac codes becouse they have been deleted.
I would try a different scanner first.. then check all of your grounds and connections, including the PCM. Make sure both PCM harnesses are screwed in tight.
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Old Jul 5, 2020 | 09:39 AM
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If PCM has not been tuned, I would have it reflashed turning off deleted equipment. PCM defaults for the different codes can problematic, it's best just make them go away.
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Old Jul 6, 2020 | 01:28 PM
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Originally Posted by Tyler Dietzenbach
I would try a different scanner first.. then check all of your grounds and connections, including the PCM. Make sure both PCM harnesses are screwed in tight.
1995 LT1 PCMs dont have screw type connectors unlike the later LS1 PCMs. His should just be the click type that have the "clips" that attach to the socket housing. Like a typical pigtail/sensor connection just to clear up any future confusion for LT guys.

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