Reductant Injection Valve Circuit High Bank 2 Unit 2
The P2058 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the reductant injection valve circuit for Bank 2, Unit 2. This valve is part of the selective catalytic reduction (SCR) system, which injects diesel exhaust fluid (DEF) into the exhaust stream to reduce NOx emissions. A high circuit voltage typically points to a short to power, open circuit, or a faulty valve or wiring.
1. Most Common Causes
- Faulty reductant injection valve
- Short to power in the valve circuit
- Open or damaged wiring/connectors
- Corroded or loose electrical connections
- Failed PCM (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance or power
- Increased exhaust emissions
- Possible DEF system warning message on dashboard
3. Step-by-Step Diagnosis
Step 1: Connect a scan tool and verify the code P2058. Check for other related codes.
Step 2: Visually inspect the reductant injection valve and its wiring harness for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test the valve's resistance and check for shorts to power or ground.
Step 4: If wiring and valve appear okay, test the circuit at the PCM connector to isolate the issue.
Step 5: Replace the valve or repair wiring as needed, then clear the code and test drive.
4. 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 lead to reduced engine performance and increased emissions. The vehicle may enter limp mode to protect the SCR system.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor. The reductant injection valve itself costs $50-$150, and labor adds $100-$250 depending on the shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.