Pontiac G8 in Limp Mode DTC Codes - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 6 (permalink) Old 02-27-2019, 09:55 AM Thread Starter
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Exclamation Pontiac G8 in Limp Mode DTC Codes

Not sure if anyone has seen or experienced this issue, but for the third time now I gotten a mass number of DTC codes (below) that put the car in limp mode.

U0121 ABS
U0101 CM and the EBCM is not working?
P0700 The PCM detected a malfunction in the transmission control system
P2544 Input signal malfunction (TCM and PCM)
P0856 Traction Ctrl
P0073 Power Control Module (PCM)

I may try and look at the TCM and its connector, I do not think the ECU has failed because the car still starts and runs fine but triggers a mass number of DTC codes...

I pulled out all of the fuses and reseated them, cleared the DTC codes then they came back after driving about 10 miles down the road or so its a weird intermittent problem.

Any help or suggestions is appreciated.

I have 62k on the car.

Thanks,
Gary

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post #2 of 6 (permalink) Old 02-27-2019, 10:12 AM
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Is a device plugged in the obd2 (on-board) diagnostic port? If not, might be a loose connection somewhere.
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post #3 of 6 (permalink) Old 02-27-2019, 10:19 AM
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Check your battery terminals. Also, verify that your alternator is charging

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post #4 of 6 (permalink) Old 02-27-2019, 10:25 AM
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Might be unrelated, but worth checking as well. https://www.g8board.com/forums/4-tec...eck-yours.html

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post #5 of 6 (permalink) Old 02-27-2019, 12:31 PM Thread Starter
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Thanks! So the battery terminals were cleaned, and the alternator is good. I checked ground wires from the trunk battery connector into the engine compartment and also verified the fuses were making clean connections, cleared the DTC no P codes now but they will return...

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post #6 of 6 (permalink) Old 02-27-2019, 12:34 PM Thread Starter
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I just read that thread you sent me thanks! I have not looked under the car, the fellow mentioned his issue was the Bolt which secured the Ground Cable to the chassis... I will check that now.

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