P260F

Reductant Pump Control Circuit High

P260F is a generic OBD-II powertrain diagnostic trouble code: Reductant Pump Control Circuit 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
P260F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
Need P260F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P260F means

P260F is set when the control module detects that the voltage or current on the DEF (reductant) pump control circuit is higher than expected. The DEF pump is driven by a control module output that regulates pump speed or duty cycle to maintain the correct DEF pressure. A high control circuit condition typically indicates a short to battery voltage in the pump control wiring, an open in the low-side return path, or a driver circuit fault within the control module.

When the pump control circuit is stuck high, the module may be unable to regulate pump speed correctly, leading to over-pressurisation or erratic DEF delivery. Alternatively, if the circuit fault prevents the module from reading pump feedback correctly, it may log P260F as a monitored output that is not responding as expected. In either case, correct DEF dosing is compromised.

The MIL will illuminate and, depending on calibration, the system may enter a limp or de-rate mode if the dosing system cannot be confirmed operational. Diagnosis starts with checking the pump control circuit for a short to voltage before testing the pump motor itself or replacing the control module. Related pressure and flow codes should be reviewed together.

Common causes

Most-frequently reported root causes when P260F is logged.

  • 1
    Short to battery voltage in the DEF pump control circuit wiring.
  • 2
    Open in the pump control circuit low-side (ground) return path.
  • 3
    Failed DEF pump with internal winding short affecting the control driver.
  • 4
    Faulty control module output driver for the pump circuit.
  • 5
    Damaged wiring harness causing control wire to contact a positive voltage source.
  • 6
    Incorrect pump installed with mismatched electrical characteristics.
  • 7
    Corrosion in the pump connector creating unintended voltage paths.

Symptoms drivers notice

MIL illuminated.
DEF system or SCR fault warning on the instrument cluster.
Incorrect DEF pressure (over-pressure or erratic pressure) during dosing.
Engine torque de-rate if dosing cannot be confirmed.
Possible additional DEF pressure or flow codes stored.

How to diagnose P260F

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all stored DTCs with a scan tool and note any DEF pressure or pump-related companion codes.
  2. 2
    Disconnect the DEF pump connector and check for battery voltage on the control circuit with the ignition on.
  3. 3
    Inspect pump wiring for chafing or contact with voltage sources.
  4. 4
    Measure resistance between the pump control wire and battery positive to identify a short.
  5. 5
    Command the pump on via scan tool actuator test and monitor control circuit voltage and pump operation.
  6. 6
    Check the pump connector and terminals for corrosion or moisture intrusion.
  7. 7
    Replace the DEF pump if circuit wiring tests good and the fault is internal to the pump.

Vehicles where we've handled P260F

Platforms in our catalogue with confirmed P260F coverage.

BMW 320D
2016

Related powertrain codes

Frequently asked questions

Can P260F damage the DEF pump?

A sustained high-voltage condition on the control circuit can stress the pump motor or driver circuit. Timely diagnosis prevents secondary component damage.

Will disconnecting the pump confirm the fault location?

Yes. If the high-circuit voltage disappears when the pump is disconnected, the fault is likely internal to the pump. If voltage remains, the wiring or module is the source.

Is P260F the same as a pump relay fault?

Not necessarily. Some systems use a dedicated driver circuit rather than a relay. Check the system architecture in the service manual before assuming a relay is involved.

How does P260F differ from P260E?

P260E typically describes a low control circuit condition while P260F describes a high condition. Both affect pump controllability but from opposite directions.

Disabling P260F in software

RaceTune can permanently disable P260F — 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 P260F 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

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.

Got P260F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file