P204D

DTC P204D, sometimes indicated as P204D00 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 pressure sensor circuit high.

The reductant pressure sensor measures the pressure of the diesel exhaust fluid in the exhaust system. If the pressure is too high, the DTC code will be set and the Check Engine Light will come on.
There are several things that can cause the reductant pressure sensor to malfunction and set the P204D code. These include a leak in the exhaust system, a plugged exhaust filter, a defective reductant pressure sensor, or a defective diesel exhaust fluid pump.
If the P204D code is set, the best thing to do is to have the vehicle towed to a mechanic and have the problem diagnosed and repaired.

• P204D: Pressure Sensor Circuit High
• P204D: Reductant Pressure Sensor Circuit High
• P204D: Reductant pressure sensor – circuit high
• P204D 00: Reductant pressure sensor - circuit high