The P2039 trouble code indicates a low voltage condition in the reductant injection air pressure sensor “A” circuit.
P2039 Reductant Injection Air Pressure Sensor “A” Circuit Low
Code symptoms P2039.
1. Malfunction indicator lamp (MIL) or Check Engine Light (CEL) illuminated.
2. Decreased engine performance.
3. Reduced fuel efficiency.
4. Increased emissions.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P2039.
1. Faulty reductant injection air pressure sensor “A”.
2. Wiring or connector issues in the sensor circuit.
3. Vacuum leaks in the intake system.
4. Exhaust system leaks.
Code Solutions P2039.
1. Inspect the reductant injection air pressure sensor “A” and replace if faulty.
2. Check the wiring and connectors in the sensor circuit for damage, corrosion, or loose connections. Repair or replace as necessary.
3. Inspect the intake system for vacuum leaks and repair as needed.
4. Inspect the exhaust system for leaks and repair as needed.