P245D

Exhaust Gas Recirculation Cooler Bypass Valve Stuck Open

P245D is a generic OBD-II powertrain diagnostic trouble code: Exhaust Gas Recirculation Cooler Bypass Valve Stuck 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
P245D
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
Need P245D disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P245D means

P245D is a rationality fault set when the ECM commands the EGR cooler bypass valve to close but the monitored temperature or flow response indicates the valve has remained open. Unlike the circuit codes, this is a mechanical or functional fault rather than a pure electrical one, though electrical causes can also prevent proper valve actuation.

When the bypass is stuck open, exhaust gas bypasses the EGR cooler and enters the intake at higher temperatures. This reduces the density benefit of cooled EGR and can increase NOx emissions and combustion temperatures. The ECM detects the anomaly by comparing commanded position against expected thermal response or by a dedicated position sensor signal.

Common root causes include carbon deposits that jam the valve flap in the open position, a failed return spring, or a solenoid that does not generate enough force to move the valve. Cleaning the bypass valve passage and actuator mechanism is often the first corrective step before resorting to replacement.

Common causes

Most-frequently reported root causes when P245D is logged.

  • 1
    Carbon deposit buildup jamming the bypass valve flap in the open position.
  • 2
    Broken or weak return spring inside the bypass valve assembly.
  • 3
    Failed solenoid actuator unable to generate sufficient force to close the valve.
  • 4
    Vacuum line leak preventing adequate actuation force on vacuum-operated designs.
  • 5
    Damaged valve stem or pivot binding the mechanism.
  • 6
    EGR cooler bypass passage blocked with soot, preventing valve seating.
  • 7
    Wiring fault causing intermittent actuation.

Symptoms drivers notice

MIL illuminated.
Higher-than-normal EGR gas temperatures entering the intake.
Possible increase in NOx emissions.
Slight reduction in engine response under conditions requiring cooled EGR.
Potential for increased intake temperature-related knock on petrol engines.

How to diagnose P245D

A typical diagnostic flow when this code is present.

  1. 1
    Read all DTCs and check for companion EGR temperature or flow codes.
  2. 2
    Inspect the bypass valve actuator for physical damage and check for free movement.
  3. 3
    Check for carbon deposits in the bypass passage and clean if necessary.
  4. 4
    Verify the actuator receives correct command signal voltage or vacuum when closed position is commanded.
  5. 5
    Test solenoid operation by applying voltage or vacuum directly and observing valve movement.
  6. 6
    Inspect vacuum lines for leaks or cracks on vacuum-actuated systems.
  7. 7
    Replace the bypass valve assembly if the mechanism is mechanically seized or spring-broken.

Vehicles where we've handled P245D

Platforms in our catalogue with confirmed P245D coverage.

VW TOURAN 20D
BMW 320D
2016

Related powertrain codes

Frequently asked questions

Will cleaning fix P245D?

If the valve is stuck open due to carbon deposits, cleaning the valve and passage can resolve the fault, but the repair should be verified with a drive cycle.

Can P245D damage the EGR cooler?

Persistent operation with un-cooled exhaust gas bypassing the cooler does not directly damage the cooler but can raise intake temperatures and affect engine efficiency over time.

Is P245D the same as an EGR flow fault?

No; P245D is specific to the bypass valve position, not the overall EGR flow rate. Separate codes cover EGR flow faults.

How urgent is P245D?

It is not an immediate safety concern, but it should be addressed within a normal service interval to maintain emissions compliance and cooler EGR temperatures.

Disabling P245D in software

RaceTune can permanently disable P245D — 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 P245D 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 EDC17C74 verified 1 software version
  • Bosch EDC17CP09 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 P245D 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