P20B1Reductant heater coolant control valve - open circuit
Generic (OBD-II) interpretation in the TuningBot DTC database.
P · PowertrainEmissionsOBD2
What P20B1 means
P20B1
Reductant heater coolant control valve - open circuit
Generic · emissions
Data confidence78%
The control module detected an interruption (open circuit) in the Reductant heater coolant control valve 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 coolant control valve
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.
0B1
Specific fault index within the subsystem.
Frequently asked questions about P20B1
What does P20B1 mean?
Reductant heater coolant control valve - open circuit. The control module detected an interruption (open circuit) in the Reductant heater coolant control valve circuit, so the expected electrical continuity was not present.
Is P20B1 generic or manufacturer-specific?
P20B1 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P20B1 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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