Hello, I have a 2011 malibu that has some odd electrical ...

Hello, I have a 2011 malibu that has some odd electrical things going on. Misfires will start and the tac with stop working, As soon as the tac stops working the [engine](/topics-engine-chevy/) will stop missfiring. Could this be ...

Hello, I have a 2011 malibu that has some odd electrical things going on. Misfires will start and the tac with stop working, As soon as the tac stops working the [engine](/topics-engine-chevy/) will stop missfiring. Could this be due to wire loom on the harness that has rotted away and heat causing issues within the harness? Mechanic's Assistant: Have you checked the coolant level? Has there been any leaking from the hoses? No leaking that I have seen, and coolant level is good. Mechanic's Assistant: Are you fixing your Malibu yourself? What have you tried so far? Fixing myself. I replaced the wire loom that is in front of the motor. all of that was gone. Seems to of fixed most of the issues, but still felt a miss. Looks like the harness loom to the injectors wiring is also bad. Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? Cleaned the mass air flow sensor as well. the engine light came on but after putting the wiring loom on it went off on it's own.

Automotive Expert
Hi there I will do all I can to help, By the tac you mean the tachometer for the rpms? this is controlled by the crank position sensor most of the time. I would run a scan for any hidden or pending codes, sometimes an issue can be intermittent and will make the engine light go away but the code will be stored, this would give you a starting point for diagnostics.

the Tachometer for the rpm would stop working. There was a code for the crank postion sensor that came up today. along with multiple misfire code, p0300could this be a heat issue with the wiring harness?
Automotive Expert
not necessarily a heat issue but maybe a wiring issue. I will find a wiring diagram for you and a troubleshooting guid for the p0300 code. do you have access to a multimeter to do a continuity test on the circuit for the crank sensor?

I do have a multimeter
Automotive Expert
ok. what is the engine size of your vehicle?

Automotive Expert
flex fuel?

Automotive Expert
ok give me a few minutes.
Automotive Expert
Here is a diagram for the crank sensor circuit. i highlighted the wires coming from the crank sensor into the pcm, i will get a connector pinout on the pcm for you. check the wires for continuity first.
Automotive Expert
Here is the pinout for the pcm connector.

Ok, I will check out some issues in the morning. Thanks for the help.
Automotive Expert
No problem, don't hesitate to ask for help on this same chat. I should be online tomorrow morning.

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