P0027: Exhaust Valve Control Solenoid Circuit Range/Performance Bank 1
The P0027 code indicates that the Engine Control Module (ECM) has detected a malfunction in the exhaust valve control solenoid circuit for Bank 1. This solenoid is part of the variable valve timing (VVT) system, which adjusts the timing of the exhaust valves to optimize engine performance, fuel economy, and emissions. The code is set when the ECM detects that the solenoid's electrical circuit is out of the expected range or the solenoid is not performing as commanded. This can be due to electrical issues, mechanical binding, or oil flow problems.
01. Most Common Causes
- Faulty exhaust valve control solenoid
- Wiring or connector issues in the solenoid circuit
- Low engine oil level or dirty oil
- Oil flow blockage to the VVT system
- ECM software or hardware failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and power
- Poor fuel economy
- Rough idle or engine hesitation
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Inspect the exhaust valve control solenoid connector and wiring for damage, corrosion, or loose connections.
Step 3: Check engine oil level and condition; change if dirty or low.
Step 4: Test the solenoid resistance with a multimeter and compare to manufacturer specs.
Step 5: Perform a bidirectional test with a scan tool to command the solenoid and verify operation.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances with this code as it can cause reduced performance and potential engine damage. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The solenoid itself costs $50-$150, and labor adds $100-$250 depending on vehicle and shop rates.