P26F4

Coolant Pump "C" Control Circuit/Open

P26F4 is a generic OBD-II powertrain diagnostic trouble code: Coolant Pump "C" Control Circuit/Open. 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
P26F4
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
Need P26F4 disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
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Detailed reference content for P26F4 is being prepared. What you see above — the code's group, system, and the software disable option below — is accurate and complete; the long-form explainer, common causes, symptoms, and diagnostic steps will appear here once they have been reviewed.

Vehicles where we've handled P26F4

Platforms in our catalogue with confirmed P26F4 coverage.

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

Related powertrain codes

Disabling P26F4 in software

RaceTune can permanently disable P26F4 — 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 P26F4 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 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.

Got P26F4 in your scan?

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

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