Shift Solenoid D Malfunction
What it means
The transmission control module (TCM) has detected a fault in shift solenoid D. This solenoid is found in multi-speed transmissions and its role varies by manufacturer; a fault can cause lost gears or limp mode.
Symptoms4
- Some gears missing, often the upper gears or some middle shifts depending on design.
- Transmission held in one gear in limp mode.
- Harsh or delayed shifts.
- Check engine light on.
Possible causes6
- Low or dirty transmission fluid.
- Corroded or oil-soaked transmission connector.
- Broken or chafed wire in the solenoid D circuit.
- Failed or sticking shift solenoid D.
- Damaged internal harness or valve body.
- Transmission computer fault (less common).
How to diagnose5
- Read all codes and check for a specific code such as P0766 or P0768.
- Check fluid level and condition.
- Check service information to learn which gears solenoid D takes part in for your transmission.
- Measure solenoid D resistance and compare it with the manufacturer specification, and inspect the connector and wiring.
- Watch commanded and actual gear on a scan tool to find the affected shift.
How to fix6
- Top up the fluid, or change it and the filter.
- Clean the connector and repair damaged wiring.
- Replace shift solenoid D or the solenoid pack if it is proven faulty.
- Repair the internal harness or valve body when needed.
- Reprogram or replace the computer after the above is ruled out.
- Clear the codes, then road test through all gears.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low when fluid, a connector or a wire is the cause, and rises if a complete solenoid pack or a valve body is needed.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
Why doesn't every car have this code?
Older transmissions or those with fewer gears use fewer solenoids, while solenoid D is usually found in transmissions with more gears.
Is this code always expensive?
Not necessarily. Many cases come down to a connector, a wire or the fluid; the high cost applies when a solenoid pack or valve body must be replaced.
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What was wrong? (optional)
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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