Every time your transmission changes gears, a series of shift solenoids are activated and deactivated by the ECU/TCM. These little electromechanical devices are responsible for channeling pressurized transmission fluid to move the correct parts around so the next gear change can take place. If the shift solenoid labeled “A” is not performing according to the preprogrammed parameters saved in the ECU, a P0972 DTC will be triggered.
How Serious is the Code?
The P0972 diagnostic trouble code is extremely serious, even though the symptoms may not seem very bad at first. Transmission solenoid problems can eventually keep the transmission from shifting, which could leave you stranded.
Symptoms of a P0972 include:
- Harsh shifts
- Transmission may not shift into gear
- The transmission fluid level is too low
- Transmission fluid is too dirty
- Damaged/broken wires
- Broken/corroded connectors
- Shift solenoid failure
How to Diagnose the Code?
The first step to diagnosing a P0972 OBDII trouble code is to first check the level and condition of the transmission fluid. It’s too dirty or low, the shift solenoids will not be able to function properly. Next, the wiring and connectors along the transmission wiring harness will need to be inspected for signs of damage and corrosion. If everything has checked out up to this point, then the shift solenoids will need to be tested.
What Repairs Will Fix P0972?
- Service the transmission
- Replace or repair damage wiring/connectors
- Replace shift solenoid
- P0973 – Shift Solenoid “A” Control Circuit Low
- P0974 – Shift Solenoid “A” Control Circuit High