P203D

DTC P203D, sometimes indicated as P203D00 is an OBD diagnostic trouble code indicating a manufacturer-specific fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the air/fuel mixture causing reductant level sensor circuit high.

The reductant level sensor circuit high code is set when the reductant level sensor signal voltage is above a predetermined threshold. This code is usually caused by a faulty reductant level sensor or wiring problem.
The most common solution is to replace the reductant level sensor. However, if the wiring is found to be at fault, then the wiring should be repaired or replaced.

• P203D: Reductant Level Sensor Circuit High
• P203D: Reductant level sensor – circuit high
• P203D 00: Reductant level sensor - circuit high

These codes are commonly diagnosed with error code P203D.

• P215C [1] Output Shaft Speed - Wheel Speed Correlation
• P203C [1] Reductant Level Sensor Circuit Low
• P203B [1] Reductant Level Sensor Circuit Range/Performance