P20C1

Reductant Heater "C" Control Circuit/Open

DTC P20C1, sometimes indicated as P20C100 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 heater "c" control circuit/open.

This code means that the reductant heater "C" control circuit is open. This could be caused by a bad circuit board, a broken wire, or a bad connector.
To fix this code, you need to find and fix the problem that is causing the circuit to open.

  • P20C1: Reductant Heater C Control Circuit/Open
  • P20C1: Reductant Heater "C" Control Circuit/Open
  • P20C1: Reductant heater control C – open circuit
  • P20C1 00: Reductant heater control C - open circuit

DTC Trouble Code Search
Bulletins

Bulletins are notices put out by manufacturers in conjunction with the NHTSA to notify the public of manufacturing issues or changes.

  • 167-B1806-2 - ENGINE AND ENGINE COOLING
    HINO: Sb-18-013 coe heated def line dtc's P20BD, P20B9, or P20C1
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