Exhaust Valve Control Solenoid Circuit Range/Performance Bank 2
The P0029 code indicates that the Engine Control Module (ECM) has detected a malfunction in the exhaust valve control solenoid circuit for Bank 2. 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 'Range/Performance' aspect means the solenoid's electrical circuit is functioning but not within expected parameters, often due to a stuck solenoid, wiring issues, or low oil pressure. Bank 2 refers to the side of the engine opposite cylinder #1.
1. Most Common Causes
- Low engine oil level or degraded oil
- Faulty or sludge-clogged exhaust valve control solenoid
- Electrical issues in the circuit (short, open, or high resistance)
- Corroded or bent pins in the solenoid electrical connector
- Clogged VVT solenoid screen filter
- Damaged or mechanically stuck exhaust camshaft actuator (phaser)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine hesitation
- Reduced fuel economy
- Poor engine performance or lack of power
- Possible engine stalling
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and note freeze frame data.
Step 2: Inspect engine oil level and condition; change if necessary.
Step 3: Visually check wiring and connectors for Bank 2 exhaust solenoid for damage or corrosion.
Step 4: Test solenoid resistance with a multimeter; compare to manufacturer specs.
Step 5: Perform a solenoid actuation test using a scan tool to verify operation.
Step 6: If solenoid and wiring are okay, check for oil flow issues or ECM faults.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause poor performance and potential engine damage. You should 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 is $50-$150, and labor is 1-2 hours.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.