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post #1 of 8 (permalink) Old 02-04-2018, 06:29 PM Thread Starter
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Crank shaft position

Hey guys and primarily coby7 Iíve been a long time reader on the forums and have 2 08 ls cobalts my car the Manuel has been having some codes and issues with rpms quitting, jerking and sometimes stalling. I have read it could be a few thing like grounding tcm which I can do tomorrow I also replaced fuse 25 I have 3 error codes showing as I have replaced my ckp and doing a relearn at dealer in morning... some guy was saying something like I need to Marry the parts but I never have heard of that... help!
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post #2 of 8 (permalink) Old 02-04-2018, 06:33 PM Thread Starter
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Also I did just see the fuse 25 today which was extremely dark in color and havenít noticed jerking yet but no Rpms
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post #3 of 8 (permalink) Old 02-05-2018, 03:12 AM
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Those codes relate to sensors all fed by the same voltage. You may have a frayed wire in the harness going to these. Maybe the protective loom has deteriorated.

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post #4 of 8 (permalink) Old 02-05-2018, 04:02 AM Thread Starter
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Ok that sounds right the plastic cover around the wires is falling away would you get the relearn this morning itís 90 usd
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post #5 of 8 (permalink) Old 02-05-2018, 05:29 AM
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Relearn might not work if wire problem still exist. If the car starts and runs, I'd wait until you have no codes after clearing them. Plus your car will re-learn the crank position sensor over time if the engine goes through rpm range.

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post #6 of 8 (permalink) Old 02-05-2018, 05:56 AM Thread Starter
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Ok thank you for the advice Iím going to ground my tcm cause itís canít hurt and check all my wiring out
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post #7 of 8 (permalink) Old 02-05-2018, 06:50 AM Thread Starter
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I bought a volt meter is there anything I should check ?
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post #8 of 8 (permalink) Old 02-05-2018, 09:16 AM Thread Starter
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This is my car running like I hate this air bag just happened I think itís where I took front airbag button out to install radio ...
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