P0747: Pressure Control Solenoid A Stuck On
What to do
Expect a hard jolt at every gear change, worst when driving gently. Not usually harmful to the transmission itself, but it should be diagnosed rather than lived with — and if the gearbox is also stuck in one gear, this harshness may be the protective mode rather than a fault of its own.
What this code means
The pressure control solenoid is holding pressure at a fixed high value rather than modulating it down for light-load shifts. The result is a transmission that shifts violently — a bang or a jolt through the vehicle at every change, most obvious when driving gently, because that is when pressure should have been backed off most.
The fault does not usually damage clutches, since excessive pressure applies them harder rather than letting them slip. What it can damage is everything else in the driveline that absorbs the shock, and it is unpleasant enough to be worth fixing promptly on those grounds alone.
Worth noting: high line pressure is also what many transmissions deliberately command when they enter their protective mode. So harsh shifting alongside a limp-mode code may be the protection working as designed rather than this solenoid failing, and the other stored codes should be read before this one is acted on.
Likely causes
Start here
- Faulty pressure control solenoid · moderate
- Debris in the transmission fluid · moderate
- Stuck valve in the valve body · specialist
Less common
- Wiring shorted to ground · moderate
- Fault causing limp mode elsewhere in the transmission · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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