P0027 – Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 1)
The P0027 diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected an abnormal operating range or performance in the exhaust valve control solenoid circuit on Bank 1. This fault is typically related to the Variable Valve Timing (VVT) system and may be caused by electrical, hydraulic, or mechanical problems.
Symptoms of P0027
- Check Engine Light illuminated.
- Reduced engine power.
- Poor acceleration.
- Rough or unstable idle.
- Increased fuel consumption.
- Engine hesitation.
- Possible engine stalling in severe cases.
Common Causes
- Faulty exhaust VVT oil control solenoid.
- Dirty, low, or incorrect engine oil.
- Blocked oil passages affecting VVT operation.
- Damaged wiring or poor electrical connections.
- Faulty camshaft position sensor.
- Worn timing chain or incorrect valve timing.
- Internal ECM failure (rare).
How to Diagnose P0027
- Check the engine oil level, condition, and viscosity.
- Scan for additional diagnostic trouble codes.
- Inspect the exhaust valve control solenoid and its connector.
- Measure the solenoid resistance according to manufacturer specifications.
- Monitor VVT operation using a scan tool.
- Inspect the timing chain and valve timing if necessary.
- Check the wiring harness for shorts or open circuits.
Possible Repairs
- Replace the engine oil and oil filter.
- Replace the faulty exhaust VVT oil control solenoid.
- Repair damaged wiring or electrical connectors.
- Clean blocked oil passages.
- Replace a faulty camshaft position sensor.
- Repair or replace worn timing chain components.
Can You Drive With Code P0027?
Although the vehicle may continue to run, driving with code P0027 is not recommended. Ignoring the issue can reduce engine performance, increase emissions and fuel consumption, and eventually lead to more expensive engine repairs.
Estimated Repair Cost
- Oil and filter change: $30–$100
- VVT oil control solenoid replacement: $100–$350
- Camshaft position sensor replacement: $50–$250
- Timing chain replacement: $600–$2,500
Related Trouble Codes
- P0026 – Intake Valve Control Solenoid Circuit Range/Performance (Bank 1)
- P0028 – Intake Valve Control Solenoid Circuit Range/Performance (Bank 2)
- P0029 – Exhaust Valve Control Solenoid Circuit Range/Performance (Bank 2)
- P0013 – Exhaust Camshaft Actuator Circuit (Bank 1)
- P0014 – Exhaust Camshaft Timing Over-Advanced (Bank 1)