What it means
The control module detects a range or performance problem in the shift solenoid D control circuit.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Shift solenoid D is an electrically controlled valve that regulates transmission fluid flow for gear changes. The transmission control module sets P0981 when the D solenoid circuit's response or operation falls outside the expected range, even if the circuit is not simply open or shorted.
Common causes
Most likely first.
- Faulty shift solenoid D
- Open, shorted, or high-resistance wiring or connection
- Transmission control module fault
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
How to diagnose it
- Review freeze-frame and transmission live data for the D solenoid command and the shift conditions when P0981 appeared; check for related transmission codes.
- Inspect the D solenoid connector and wiring for loose or corroded terminals, chafing, or damage that could cause an intermittent or high-resistance connection.
- Check shift solenoid D coil resistance and operation using the manufacturer's test procedure and specifications.
- Test the D control circuit for opens, shorts, and excessive resistance between the transmission and control module.
- If the circuit and solenoid meet specification, verify module powers, grounds, connector terminals, and the D command before concluding the module is faulty.
Common fixes
- Repair a loose, corroded, or damaged connection in the D solenoid circuit.
- Repair wiring with an open, short, or excessive resistance.
- Replace shift solenoid D if it fails the manufacturer's electrical or operation test.
- Repair or replace the control module only after its circuit and outputs are confirmed faulty.
Can I keep driving?
A transmission that shifts harshly, slips, or enters limp mode should be driven only as needed to reach a safe place for service; avoid towing and heavy acceleration. Continued slipping or abnormal shifts can worsen transmission damage.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.