P2C62

Reductant Pump Speed Too High

P2C62 is a generic OBD-II powertrain diagnostic trouble code: Reductant Pump Speed Too High. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2C62
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
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What P2C62 means

P2C62 is set when the ECM or SCR (Selective Catalytic Reduction) control module detects that the DEF (Diesel Exhaust Fluid) reductant pump is operating at a rotational speed that exceeds the commanded or expected calibration limit. The reductant pump delivers AdBlue/DEF from the tank to the dosing injector at a precisely controlled flow rate matched to exhaust NOx levels.

Excessive pump speed can result in over-dosing of reductant, which may cause ammonia slip past the SCR catalyst and lead to secondary catalyst contamination or a strong ammonia odor from the exhaust. The condition may be caused by a faulty pump, a stuck pressure regulator, or a wiring fault that causes the pump motor to receive an uncontrolled supply voltage.

Diagnosis requires reviewing live data for actual versus commanded pump speed, checking the pump power supply circuit for excessive voltage, and verifying the integrity of the pump motor and its drive signal. The reductant system should be inspected for blockages downstream that could cause pump speed feedback errors.

Common causes

Most-frequently reported root causes when P2C62 is logged.

  • 1
    Faulty reductant (DEF) pump motor operating out of specification.
  • 2
    Pump speed feedback sensor or circuit providing incorrect signal to the control module.
  • 3
    Excessive supply voltage to the pump motor due to a wiring fault.
  • 4
    Failed pump driver circuit within the SCR control module.
  • 5
    Downstream restriction causing the control module to misread pump load versus speed.
  • 6
    Contaminated DEF fluid causing abnormal pump behavior.
  • 7
    Software or calibration error in the SCR control module.

Symptoms drivers notice

MIL and possibly an AdBlue/SCR warning lamp illuminated.
Possible ammonia odor from the exhaust if over-dosing occurs.
AdBlue consumption higher than expected.
SCR system efficiency faults may accompany this code.
Potential entry into reduced power or inducement mode depending on manufacturer implementation.

How to diagnose P2C62

A typical diagnostic flow when this code is present.

  1. 1
    Read all active and pending DTCs and note any accompanying SCR or NOx efficiency codes.
  2. 2
    Review live data for commanded versus actual reductant pump speed.
  3. 3
    Check the pump motor supply voltage and ground integrity.
  4. 4
    Inspect the pump speed feedback circuit for shorts, opens, or signal interference.
  5. 5
    Verify DEF fluid quality and concentration with a refractometer.
  6. 6
    Inspect the reductant line and dosing injector for restrictions or blockages.
  7. 7
    Replace the reductant pump if electrical checks are within spec but speed remains uncontrolled.

Vehicles where we've handled P2C62

Platforms in our catalogue with confirmed P2C62 coverage.

BMW X5
2018–2019
BMW 530XD
2017
BMW 320D
2016
BMW 530XD 30D

Related powertrain codes

Frequently asked questions

Does P2C62 cause a loss of power?

Not immediately, but if the SCR system remains out of calibration, the vehicle may eventually enter an inducement or reduced power mode per emissions regulations.

Can bad DEF fluid cause this code?

Yes. Contaminated or incorrect concentration DEF can affect pump performance and trigger speed-related faults.

Is P2C62 a common fault?

It is less common than dosing or NOx efficiency codes and usually indicates a pump hardware or wiring issue.

Can I top up with fresh DEF to resolve this?

If the fault is caused by contaminated DEF, draining and refilling with quality fluid may help, but a wiring or pump fault will require proper repair.

Disabling P2C62 in software

RaceTune can permanently disable P2C62 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P2C62 disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch EDC17C50 verified 1 software version
  • Bosch EDC17C56 verified 1 software version
  • Bosch MD1CP002 verified 1 software version
  • Bosch MD1CS001 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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