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TuningBot DTC Database · v4.37.15

P248B Reductant Heater A Sense Circuit High

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

P · PowertrainEmissionsOBD2

What P248B means

P248B
Reductant Heater A Sense Circuit High Generic · emissions Data confidence 65%

The control module detected that the signal in the Reductant Heater A Sense 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

  • Reductant quality or level fault
  • Dosing valve or supply module fault
  • NOx sensor fault
  • Frozen or crystallized reductant lines
  • Wiring or connector fault

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

Related codes
P248AP248CP248D
P24 range
P2400P2401P2402P2403P2404P2405P2406P2407P2408P2409P240AP240BP240CP240DP240EP240FP2410P2411

How to read P248B

P

Powertrain: engine, transmission and driveline systems.

2

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

48B

Specific fault index within the subsystem.

Frequently asked questions about P248B

What does P248B mean?

Reductant Heater A Sense Circuit High. The control module detected that the signal in the Reductant Heater A Sense circuit stayed above the expected operating range.

Is P248B generic or manufacturer-specific?

P248B is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P248B 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.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: SCR / AdBlue System

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

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