This code indicates the engine control module has detected a lower than expected voltage condition in the circuit for the Diesel Exhaust Fluid (DEF) injector on bank 2, unit 2. This specific injector is part of the Selective Catalytic Reduction (SCR) system used to reduce nitrogen oxide emissions in diesel engines. The issue is typically electrical, involving the injector itself or the wiring harness connecting it to the control module.
Internal electrical shorts within the injector heater or valve are the most common cause of low voltage codes. Replacement is usually required to resolve the internal failure.
Wires near exhaust components often degrade due to heat exposure or chafing against engine parts. Insulation melting can expose conductors to ground causing low voltage.
Exposure to road salts and DEF fluid spills can cause terminal corrosion leading to poor contact. This increases resistance and drops circuit voltage.
Hardened fluid around the injector tip can stress internal components and cause electrical faults. Leakage from the seal often contributes to connector corrosion.
Insulation failure within the main harness can cause the circuit voltage to drop below thresholds. Vibration over time often leads to wire fatigue and breaks.
Internal driver failure within the PCM is possible but statistically rare compared to component failure. This should only be considered after all external circuits are verified.
It is highly unlikely. Control module failure is rare for this code; the injector or wiring is the cause in the vast majority of cases.
Short-term driving is possible, but the vehicle may enter reduced power mode and will fail emissions inspections.
No, this code indicates an electrical circuit fault, not a low fluid level condition.
Cleaning is generally not effective for internal electrical failures; replacement is the standard repair procedure.