The P2051 trouble code indicates that the reductant injection valve circuit for bank 2, unit 1 is experiencing a low voltage condition.
P2051 Reductant Injection Valve Circuit Low Bank 2 Unit 1
Code symptoms P2051.
1. Malfunction indicator lamp (MIL) or Check Engine Light (CEL) illuminated.
2. Changes in exhaust emissions.
3. Reduction in fuel efficiency.
4. Decrease in engine performance.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2051.
1. Faulty reductant injection valve.
2. Low voltage supply to the reductant injection valve circuit.
3. Corrosion or damage to the connectors in the reductant injection valve circuit.
4. Faulty powertrain control module (PCM).
Code Solutions P2051.
1. Inspect the reductant injection valve and replace if faulty.
2. Check the voltage supply to the reductant injection valve circuit. Repair any issues with low voltage supply.
3. Inspect the connectors in the reductant injection valve circuit for corrosion or damage. Clean or replace connectors as necessary.
4. Perform a PCM reset or reflash to clear the code. If the issue persists, consider replacing the PCM.