Reductant Injection Air Pump Control Circuit High
P2061 indicates the reductant injection air pump control circuit is receiving a voltage signal higher than expected. This typically affects selective catalytic reduction (SCR) systems used in diesel and some gasoline engines to reduce emissions. If not addressed, catalyst damage and increased emissions can result.
What You Might Notice
- Reduced fuel efficiency
- Excessive black smoke from exhaust
- Diminished engine performance
- Check Engine Light illuminated
- Other SCR-related codes present
Most Common Causes
- 1
Defective reductant air pressure sensor
The sensor monitoring reductant injection air pressure may be faulty, sending incorrect voltage signals to the PCM. This causes the control circuit to register abnormally high voltage readings.
- 2
Wiring or connector issues
Damaged, corroded, or loose connections in the reductant injection air pump circuit can cause resistance changes and high voltage readings at the control module.
- 3
Faulty reductant injection air pump
The pump itself may be malfunctioning or drawing excessive current, creating higher than normal voltage in the control circuit.
- 4
PCM or control module failure
The engine control module may have an internal fault preventing proper regulation of the pump control circuit voltage.
How to Diagnose It
- 1
Check Defective reductant air pressure sensor — The sensor monitoring reductant injection air pressure may be faulty, sending incorrect voltage signals to the PCM. This causes the control circuit to register abnormally high voltage readings.
- 2
Check Wiring or connector issues — Damaged, corroded, or loose connections in the reductant injection air pump circuit can cause resistance changes and high voltage readings at the control module.
- 3
Check Faulty reductant injection air pump — The pump itself may be malfunctioning or drawing excessive current, creating higher than normal voltage in the control circuit.
- 4
Check PCM or control module failure — The engine control module may have an internal fault preventing proper regulation of the pump control circuit voltage.
How to Fix It
- 1
Test and replace reductant air pressure sensor
Use a multimeter to check the sensor output voltage and compare against manufacturer specifications. If out of range, replace the sensor and retest to see if code clears.
- 2
Inspect and repair wiring and connectors
Visually inspect the pump control circuit wiring harness and connectors for damage, corrosion, or loose connections. Clean corroded terminals and repair or replace damaged wiring as needed.
- 3
Test and replace reductant injection air pump
Verify pump operation and current draw using diagnostic equipment. If the pump draws excessive current or fails to operate, replace it with a new unit.
- 4
Clear code and perform system retest
After repairs, clear the diagnostic trouble code using a scanner and perform a test drive to verify the code does not return. If it persists, seek professional diagnostic assistance to rule out PCM failure.
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