Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P20C1 means
P20C1
Reductant heater control C - open circuit
Generic · emissions
Data confidence78%
The control module detected an interruption (open circuit) in the Reductant heater control C circuit, so the expected electrical continuity was not present.
Symptoms
MIL or SCR/AdBlue warning illuminated
Possible start-count-down or torque limitation on some applications
Possible causes
Wiring
reductant heater
ECM
Recommended checks
Read NOx sensor values and dosing system status
Check reductant level and quality data
Inspect dosing valve, lines and heater operation
Check wiring and connectors of the SCR components
Check for OEM technical bulletins and software updates
Powertrain: engine, transmission and driveline systems.
2
Generic SAE-standard code: same meaning on every make.
0C1
Specific fault index within the subsystem.
Frequently asked questions about P20C1
What does P20C1 mean?
Reductant heater control C - open circuit. The control module detected an interruption (open circuit) in the Reductant heater control C circuit, so the expected electrical continuity was not present.
Is P20C1 generic or manufacturer-specific?
P20C1 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P20C1 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
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