Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part in the engine that helps control how the exhaust valves open and close. It's like a switch that isn't working right, which can affect how the car runs.
The P25D4 code indicates a low voltage condition in the circuit controlling the exhaust camshaft actuator's park lock on bank 2.
The exhaust camshaft actuator is responsible for adjusting the position of the camshaft to optimize engine performance. The park lock control circuit ensures the actuator is in the correct position when the engine is off. A low circuit condition means the voltage is below the expected level, which can affect the actuator's operation.
• Check Engine Light illuminated
• Reduced engine performance
• Unusual engine noises
• Faulty exhaust camshaft actuator
• Wiring issues or poor connections in the circuit
• Failed control module
Camshaft: A shaft in the engine that controls the opening and closing of the valves.
Actuator: A device that moves or controls a mechanism or system.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the exhaust camshaft actuator for proper operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty exhaust camshaft actuator.
• Reprogram or replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regular maintenance and inspections
• Ensure proper electrical connections
• Use quality replacement parts
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving the vehicle if performance issues are severe.
Repairs may be covered under the powertrain warranty if applicable.
This code has been associated with issues in vehicles with advanced variable valve timing systems.
Moderate – It should be addressed soon to prevent further engine performance issues.
Driving with a malfunctioning camshaft actuator can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in park with ignition on
The exhaust camshaft actuator is located on the cylinder head, typically near the timing chain or belt.
Q: Can I drive with a P25D4 code?
A: It's not recommended to drive for extended periods as it can lead to engine performance issues.
Q: How can I prevent this code from appearing?
A: Regular maintenance and ensuring all electrical connections are secure can help prevent this code.
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