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the p1682 for pontiac is an ignition problem https://www.700r4transmissionhq.com/pontiac-g6/ as to the u0101 that can be related this code can pop up with a low voltage problem to tcm failure https://repairpal.com/obd-ii-code-u0101-lost-communication-with-tcm
Common causes for U0101
Code U0101 is typically caused by one of the following:
A dead battery
A faulty TCM
A problem with the TCM circuit
A problem with the CAN bus
I'd disconnect the battery to 'reset' the system. Disconnect only the Negative Battery terminal for 30 minutes.
NOTE YOU"LL LOSE YOUR radio presets and any other 'memorized' settings in the car. ALSO your keyless remote may no longer function. READ the Owner's Manual to confirm.
P0700 Transmission Control System Malfunction P0730 Incorrect Gear Ratio P0620 Generator Control Circuit Malfunction P1130 Not found P0340 Camshaft Position Sensor Circuit Malfunction
P0620 - Generator Control Circuit Malfunctionhttp://engine-codes.com/p0620.htmlForum CodePossible causes- Failed Generator/Belt - Battery charge - PCM controlled generator - PCM failure - Open or short generator circuit When is the code detected?The PCM has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. The voltage regulator also contains fault detection circuitry. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. This also causes the PCM to set the DTC.
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