Reductant Injection Valve Circuit High Bank 1 Unit 2
Code P2055 indicates the reductant injection valve circuit is reading higher voltage than expected on Bank 1. This typically affects SCR (Selective Catalytic Reduction) systems used in diesel engines to reduce emissions. If not addressed, catalyst damage may occur and emissions compliance will be affected.
What You Might Notice
- Diminished engine performance
- Excessive black smoke from exhaust
- Reduced fuel efficiency
- Check engine light illumination
- Possible limp mode activation
Most Common Causes
- 1
Faulty reductant injection valve
The valve itself may be stuck open or have internal electrical failure causing high circuit voltage.
- 2
Wiring issues or short to power
Open circuits, corroded connections, or inadvertent shorts in the valve circuit harness can cause voltage reading errors.
- 3
Defective valve control module or driver
The electronic control module or valve driver may be malfunctioning and unable to properly regulate valve voltage.
- 4
SCR system sensor failure
Related NOx or reductant sensors may be providing incorrect feedback, triggering the high voltage code.
How to Diagnose It
- 1
Check Faulty reductant injection valve — The valve itself may be stuck open or have internal electrical failure causing high circuit voltage.
- 2
Check Wiring issues or short to power — Open circuits, corroded connections, or inadvertent shorts in the valve circuit harness can cause voltage reading errors.
- 3
Check Defective valve control module or driver — The electronic control module or valve driver may be malfunctioning and unable to properly regulate valve voltage.
- 4
Check SCR system sensor failure — Related NOx or reductant sensors may be providing incorrect feedback, triggering the high voltage code.
How to Fix It
- 1
Inspect and repair wiring harness
Check the reductant injection valve circuit wiring for corrosion, damaged insulation, loose connectors, or shorts to power. Repair or replace damaged sections.
- 2
Replace reductant injection valve
If wiring tests normal, the valve assembly is likely faulty and must be replaced with an OEM or quality aftermarket unit.
- 3
Test and reprogram control module
Have the engine control module tested and reprogrammed if necessary. Some cases require module reflashing or replacement.
- 4
Verify SCR system sensors
Test NOx sensors and reductant level sensors in the SCR system. Replace any sensors providing incorrect voltage readings.
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