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TuningBot DTC Database · v4.37.15

P2C7A SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2

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

P · PowertrainEmissionsOBD2

What P2C7A means

P2C7A
SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2 Generic · emissions Data confidence 65%

The control module calculated that SCR NOx Catalyst efficiency dropped below the calibrated threshold for this application.

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

P2C range
P2C00P2C01P2C02P2C03P2C04P2C05P2C06P2C07P2C08P2C09P2C0AP2C0BP2C0CP2C0DP2C0EP2C0FP2C10P2C11

How to read P2C7A

P

Powertrain: engine, transmission and driveline systems.

2

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

C7A

Specific fault index within the subsystem.

Frequently asked questions about P2C7A

What does P2C7A mean?

SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2. The control module calculated that SCR NOx Catalyst efficiency dropped below the calibrated threshold for this application.

Is P2C7A generic or manufacturer-specific?

P2C7A is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P2C7A 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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