Possible causes

– Shorted or open circuit within Transmission Control Module (TCM)
– Faulty Transmission Control Module (TCM)

Tech notes

Since the P0700 is just and informative code, check the TCM for more codes to resolve the problem.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Driveability problems
– Transmission shifting problems

P0700 GMC Description

The transaxle Control Module (TCM) monitors the malfunction of sensors and actuators relating to transaxle control. When the TCM detects a malfunction with the control, a signal is send to the Engine Control Module (ECM) to trigger the Engine Light or Service Engine Soon light. The ECM stores the P0700 code and it means the TCM detected a malfunction with the transaxle controls.

GMC Technical Service Bulletins for P0700 code