Grounding Question - The Usual TCM Issues - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 1 (permalink) Old 05-25-2016, 07:14 PM Thread Starter
Join Date: Jun 2015
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Grounding Question - The Usual TCM Issues

I too have the common TCM issues that result in a wonky speedometer, awful shifting, ABS+traction control failure, and loss of power steering. It started about 2 years ago.

I grounded the TCM outer body to the frame, and replaced the TCM fuses both under the hood and in the BCM box. Voila, problem solved, until now.

Now I just get an intermittent check engine light with the same error codes as before. Disconnecting the 2 fuses and reconnecting them removes the code, but it will return within days. The usual failures don't occur; I just get a check engine light.

I took a multimeter and tested the resistance between the TCM body and the engine block (just left of the oil fill cap). My multimeter gives me:

At 20M ohm: a reading of 0.1
At 200k ohm a reading of 1.

So... 200,000ohm. That seems really high for a circuit that should ground out, right? I checked my makeshift ground, and it's clean (and reads out ~100ohms).

Any ideas?
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