P08C2
Pressure Control Solenoid L Control Circuit High.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 8
- AreaTransmission
- C2
- FaultThe specific fault in that area
What it means
P08C2 is the generic code for a high signal on the control circuit of pressure control solenoid 'L' in the automatic transmission. The transmission control unit commands the solenoid and monitors its driver circuit. It set the code because the circuit voltage or state was higher than expected, which points to a short to voltage, a driver fault or a wiring problem. Which function solenoid 'L' controls (clutch, line pressure or similar) depends on the model and gearbox, so check the manufacturer data.
Symptoms
- Gearbox warning light or malfunction indicator lamp on
- Gearbox in limp mode, stuck in one gear
- Harsh, delayed or flared gear changes
- Slipping or loss of drive in some gears
- Reduced performance or poor fuel economy
- Transmission may not shift into certain gears
Possible causes
- Wiring fault in the solenoid control circuit, such as chafed insulation or a short to voltagelikely
- Corroded, damaged or contaminated connector at the solenoid, internal harness or transmission control unitlikely
- Faulty pressure control solenoid L with an internal electrical faultlikely
- Internal transmission wiring loom damaged or fluid-soakedpossible
- Faulty transmission control unit driver circuit or control module faultpossible
- Low or degraded transmission fluid, or contamination, affecting the solenoid and its readingspossible
- Outdated control unit software, where the manufacturer lists it as a known cause for the modelrare
How to diagnose
- Read all stored and pending codes and note any other transmission or network codes, then review the freeze frame data for conditions when it set.
- Check the transmission fluid level, condition and smell, following the procedure for the specific gearbox, as some are sealed or need a set temperature.
- Inspect the external wiring and connectors between the transmission and control unit for chafing, heat damage, corrosion, water ingress and bent or pushed-back pins.
- Look up the wiring diagram for the model to identify solenoid L, its pins and expected resistance, supply and control signals.
- Measure solenoid resistance at the transmission connector and compare it with the manufacturer specification.
- With the connector disconnected, check the control wire for a short to voltage and for continuity back to the control unit.
- Check the control unit supply, earth and battery voltage, and look at the solenoid command and feedback using live data if available.
- Inspect the internal loom and solenoid connection by dropping the pan or accessing the valve body where the model requires it, after the cheaper checks.
How to fix
- Repair or replace damaged wiring, and clean or replace corroded or damaged connectors.
- Replace the pressure control solenoid L if its resistance or operation is out of specification.
- Replace the internal transmission wiring loom if it is damaged or leaking fluid into the connector.
- Correct the transmission fluid level or change the fluid and filter if contaminated, using the specified fluid.
- Repair or replace the transmission control unit if the driver fault is confirmed, and update the software if the manufacturer lists it as a known cause.
Can I keep driving?
The car can usually be driven carefully a short distance, but limp mode and poor shifting can strain the gearbox, so have it checked soon. Stop driving if the gearbox slips badly, will not select gears or the car becomes unsafe to drive.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.