P041D

Gas Recirculation Temperature Sensor B Circuit High

P041D is a generic OBD-II powertrain diagnostic trouble code: Gas Recirculation Temperature Sensor B Circuit High. It is logged by the engine control unit when the egr monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P041D
Group
Powertrain
System
EGR
Severity
Warning (MIL on)
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What P041D means

P041D is set when the PCM/ECM measures a voltage on the EGR sensor A signal circuit that is below the minimum threshold defined for that sensor type. A low circuit condition typically indicates a short to ground on the signal wire, an open in the sensor supply or reference voltage line, or a failed sensor with an internally shorted element.

Because the PCM cannot determine actual EGR flow or valve position from an invalid low signal, it may default to a fixed EGR duty cycle or disable EGR entirely to protect emissions and engine operation. The EGR system being disabled raises combustion temperatures and NOx output.

Diagnosis should begin with electrical measurements at the sensor connector. Distinguishing between a sensor failure and a wiring fault is critical before replacing parts. Unplugging the sensor and observing whether the signal voltage rises toward the reference level helps isolate the fault to the sensor versus the harness.

Common causes

Most-frequently reported root causes when P041D is logged.

  • 1
    Short to ground on the EGR sensor A signal wire.
  • 2
    Open circuit in the sensor reference voltage or supply line.
  • 3
    Failed EGR sensor A with an internally shorted signal element.
  • 4
    Corroded or water-intruded sensor connector pulling signal low.
  • 5
    Damaged wiring harness shorting the signal wire against chassis ground.
  • 6
    Faulty PCM input circuit for EGR sensor A.

Symptoms drivers notice

MIL illuminated with P041D stored.
EGR system disabled or operating at a fixed default.
Increased NOx emissions.
Possible rough idle depending on how the PCM defaults EGR duty cycle.
No significant power loss in most cases.

How to diagnose P041D

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and note any accompanying EGR or sensor supply codes.
  2. 2
    With the key on and engine off, measure voltage on the EGR sensor A signal wire at the connector.
  3. 3
    Disconnect the sensor and recheck signal wire voltage; if it rises to reference level, the sensor is faulty.
  4. 4
    If signal voltage remains low with sensor disconnected, trace the signal wire for a short to ground.
  5. 5
    Inspect the sensor reference voltage wire for an open circuit.
  6. 6
    Check the connector for corrosion, spread pins, or moisture intrusion.
  7. 7
    Replace the EGR sensor A if the wiring harness tests normal.

Vehicles where we've handled P041D

Platforms in our catalogue with confirmed P041D coverage.

BMW 320D
2016

Related powertrain codes

Frequently asked questions

What voltage should EGR sensor A signal show?

Typical signal ranges vary by sensor design (commonly 0.5 V to 4.5 V at extremes); consult the manufacturer specification for the exact idle and full-flow values.

Can moisture cause P041D?

Yes. Water intrusion into the sensor connector can create a low-resistance path to ground, pulling the signal voltage below threshold.

Is it safe to drive with the EGR disabled?

The vehicle will usually drive normally, but NOx emissions will be elevated and the fault should be repaired to pass emissions testing.

Could the PCM cause a false P041D?

A failed PCM input is possible but rare; fully test wiring and the sensor before suspecting the PCM.

Disabling P041D in software

RaceTune can permanently disable P041D — 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 P041D 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.

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