Hours: 07–23 daily

TuningBot DTC Database · v4.37.14

P20BC Reductant heater control A - circuit high

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainEmissionsOBD2

What P20BC means

P20BC
Reductant heater control A - circuit high Generic · emissions Data confidence 85%

The control module detected that the signal in the Reductant heater control A circuit stayed above the expected operating range.

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

Related and nearby codes

How to read P20BC

P

Powertrain: engine, transmission and driveline systems.

2

Generic SAE-standard code: same meaning on every make.

0BC

Specific fault index within the subsystem.

Frequently asked questions about P20BC

What does P20BC mean?

Reductant heater control A - circuit high. The control module detected that the signal in the Reductant heater control A circuit stayed above the expected operating range.

Is P20BC generic or manufacturer-specific?

P20BC is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P20BC at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database