P0085: Exhaust Valve Control Solenoid Circuit Low (Bank 2)
The P0085 code indicates that the Engine Control Module (ECM) has detected a low voltage condition in the exhaust valve control solenoid circuit for Bank 2. This solenoid is part of the variable valve timing (VVT) system, which adjusts exhaust valve timing to optimize engine performance and emissions. A low circuit voltage suggests a short to ground, open circuit, or faulty solenoid, potentially causing drivability issues and increased emissions.
1. Most Common Causes
- Faulty exhaust valve control solenoid (Bank 2)
- Open or shorted wiring in the solenoid circuit
- Poor electrical connection at the solenoid or ECM
- Failed ECM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power and fuel economy
- Failed emissions test
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors for damage or corrosion.
Step 3: Test solenoid resistance with a multimeter (specs vary; typically 6-12 ohms).
Step 4: Check for voltage and ground at the solenoid connector with the engine running.
Step 5: If wiring and solenoid are good, test ECM output or replace ECM.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause engine performance issues and potential damage to the catalytic converter.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the cause and vehicle make.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.