Whenever your transmission shifts gears, a series of shift solenoids are activated and deactivated by the ECU/TCM. These small electromechanical devices are responsible for directing pressurized transmission fluid to move the correct parts so the next gear shift can occur. If the shift solenoid labeled “A” does not operate according to the preprogrammed parameters stored in the ECU, a DTC P0972 will be triggered.
How severe is the code?
Diagnostic code P0972 is extremely severe, even if the symptoms do not seem very serious at first. Transmission solenoid issues can eventually prevent the transmission from shifting, which could leave you stranded.
Symptoms
Symptoms of a P0972 include:
- Harsh shifting
- Transmission cannot shift into gear
Causes
- 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 in diagnosing an OBDII fault code P0972 is to first check the level and condition of the transmission fluid. If it is too dirty or too low, the shift solenoids will not be able to function properly. Next, the wiring and connectors along the transmission wiring harness need to be inspected for signs of damage and corrosion. If everything has been checked up to this point, the shift solenoids will need to be tested.
What repairs will fix P0972?
- Service the transmission
- Replace or repair damaged wires/connectors
- Replace the shift solenoid