P0795
Pressure Control Solenoid C.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 7
- AreaTransmission
- 95
- FaultThe specific fault in that area
What it means
P0795 is the generic code for a fault in the Pressure Control Solenoid 'C' circuit in the automatic transmission. The transmission control unit commands the solenoid to regulate hydraulic line or clutch pressure and sees a result that does not match, such as an open or short circuit, or pressure that does not follow the command. Which clutch or function solenoid 'C' controls depends on the make, model and gearbox, so check the manufacturer data for your vehicle.
Symptoms
- Harsh, delayed or flared gear changes
- Transmission stuck in one gear (limp mode)
- Gearbox warning light or malfunction indicator lamp on
- Slipping or loss of drive in some gears
- Poor fuel economy or higher engine revs than normal
- Gearbox not shifting up or down as expected
Possible causes
- Faulty pressure control solenoid C (electrical failure or sticking)likely
- Damaged wiring, chafed loom or corroded connector between the solenoid and the transmission control unitlikely
- Low, degraded or contaminated transmission fluid, or a blocked filter, affecting pressure controllikely
- Debris or worn valve body passages causing the solenoid to stick or pressure to be wrongpossible
- Internal transmission wear, such as worn clutch packs or seals, leading to pressure that does not match the commandpossible
- Faulty transmission control unit or an outdated calibration known to affect this function for the modelrare
- Low system voltage or poor earth affecting solenoid operationrare
How to diagnose
- Read all stored and pending codes and the freeze frame data, noting any other transmission or voltage codes and the conditions when it set
- Check the transmission fluid level and condition (where a dipstick is fitted, or per the manufacturer's procedure), looking for burnt smell, dark colour or metal debris
- Inspect the wiring and connector at the gearbox and control unit for chafing, fluid ingress, corrosion and bent or loose pins
- Check battery condition and charging voltage, and the relevant earths, as low voltage can upset solenoid control
- Measure the solenoid resistance and compare it with the manufacturer's specification, and check the circuit for shorts to earth or voltage and for open circuits
- Use live data or an active test to command the solenoid and compare commanded and actual pressure or gear ratio, where the vehicle supports it
- Check for technical service bulletins or calibration updates for the model and gearbox
- If the electrical side is sound, check line pressure and inspect the valve body and filter as the manufacturer's procedure directs
How to fix
- Repair or replace damaged wiring and clean or replace corroded connectors
- Replace the faulty pressure control solenoid, or the solenoid pack or valve body where it is not supplied separately
- Correct the fluid level and renew the fluid and filter using the specified type if it is degraded or contaminated
- Clean or overhaul the valve body to clear debris and replace worn parts
- Repair or overhaul the transmission if internal wear is causing the pressure fault
- Update the control unit calibration or replace the unit only where diagnosis shows an outdated calibration or a faulty unit is the cause
Can I keep driving?
The car may be driveable, but expect harsh shifts or limp mode, and continued use with slipping or low pressure can damage the gearbox. Get it diagnosed soon, and stop driving if the gearbox slips badly or drive is lost.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.