The P2059 trouble code indicates that there is an open circuit detected in the reductant injection air pump control circuit.
P2059 Reductant Injection Air Pump Control Circuit/Open
Code symptoms P2059.
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 P2059.
1. Faulty reductant injection air pump.
2. Open circuit in the reductant injection air pump control circuit.
3. Corrosion or damage to the connectors in the reductant injection air pump control circuit.
4. Faulty powertrain control module (PCM).
Code Solutions P2059.
1. Inspect the reductant injection air pump and replace if faulty.
2. Check for continuity in the reductant injection air pump control circuit using a multimeter. Repair or replace any damaged wiring.
3. Inspect the connectors in the reductant injection air pump control 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.