Shift Solenoid A Malfunction
What it means
The transmission control module (TCM) has detected a fault in shift solenoid A, one of the solenoids that direct fluid to the clutches to select a gear. The transmission usually enters limp mode and stays in a fixed gear, and which gears are affected depends on each manufacturer's design.
Related lights
Dashboard lights that may come on with this code.
Symptoms5
- Transmission stuck in one gear, often a middle gear, with weak take-off.
- No shift into some gears, or shifts at unusual times.
- Harsh or delayed shifts.
- High engine speed on the highway because upper gears are not reached.
- Check engine light on.
Possible causes6
- Corroded or oil-soaked transmission connector.
- Broken or chafed wire in the shift solenoid A circuit.
- Failed shift solenoid coil.
- Low or dirty transmission fluid hindering solenoid movement.
- Damaged internal harness.
- Transmission computer fault (less common).
How to diagnose5
- Read all codes and look for a more specific code such as P0751 or P0753 that defines the fault type.
- Check service information to learn which gears solenoid A controls in your transmission.
- Check fluid level and condition.
- Measure solenoid resistance and compare it with the manufacturer specification, and inspect the connector and wiring.
- Command the solenoid with the scan tool if possible, and listen for its click or watch the circuit status.
How to fix6
- Top up the fluid, or change it and the filter if it is dirty.
- Clean the connector and repair damaged wiring.
- Replace shift solenoid A, or the solenoid pack if the solenoid is part of one.
- Repair the internal harness or valve body if they are damaged.
- Reprogram or replace the computer after the causes above are ruled out.
- Clear the codes, then road test through all gears and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
In the Saudi market: SAR 100–2,500 (≈ USD 27–667)
Our prices come from the Saudi market, converted at a fixed rate (SAR 3.75 per USD). Prices in your country may differ a lot, so we show the cost level.
The cost is low when fluid, a wire or a connector is the cause, and rises when the solenoid is part of a pack replaced as a unit 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
Which gears does solenoid A control?
It differs between manufacturers and transmission types; the letters A, B and C are internal labels, so check the service information for your vehicle.
Why is the transmission stuck in one gear?
That is a deliberate protection mode. When a shift solenoid fault is found, the computer holds a safe gear so you can reach a workshop without damaging the clutches.
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