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 faulty valve or wiring.
01. 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)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance
- Increased NOx emissions
- Possible DEF system warning messages
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the reductant injection valve and its wiring for damage, corrosion, or loose connections.
Step 3: Test the valve's resistance with a multimeter; compare to manufacturer specs.
Step 4: Check for voltage at the valve connector with key on; if voltage is present when it shouldn't be, trace short to power.
Step 5: If wiring and valve are okay, test the PCM output circuit; replace PCM if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the SCR system may be disabled, leading to increased emissions and potential engine derate. Have it diagnosed promptly.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts and labor, depending on the cause. A valve replacement may cost more if needed.