P041C

Gas Recirculation Temperature Sensor B Circuit Low

P041C is a generic OBD-II powertrain diagnostic trouble code: Gas Recirculation Temperature Sensor B Circuit Low. 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
P041C
Group
Powertrain
System
EGR
Severity
Warning (MIL on)
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What P041C means

P041C indicates that the PCM/ECM has detected a signal from EGR sensor A that is present and within basic electrical limits but does not correlate with expected values during an operational test. Unlike an open or short circuit fault, a range/performance code means the sensor is responding but its output disagrees with the commanded EGR position or calculated flow.

EGR sensor A may be a differential pressure sensor measuring flow across an EGR cooler, a position sensor on the EGR valve, or a temperature sensor depending on the system design. The PCM evaluates the sensor reading against modeled values; when deviation exceeds calibrated thresholds, P041C is set and EGR operation may be suspended.

Diagnosis should start with live data review of the EGR sensor A signal versus commanded EGR duty cycle. Carbon buildup restricting EGR passages, a sticking valve, or a contaminated sensor element are frequent causes before suspecting wiring or the sensor itself.

Common causes

Most-frequently reported root causes when P041C is logged.

  • 1
    Carbon deposits blocking the EGR valve or passage, preventing accurate flow.
  • 2
    Sticking or mechanically seized EGR valve not reaching commanded position.
  • 3
    Contaminated or failed EGR differential pressure or position sensor.
  • 4
    Vacuum leak in EGR actuator supply affecting valve travel.
  • 5
    Damaged or corroded wiring between the PCM and EGR sensor A.
  • 6
    Faulty PCM calibration or software requiring an update.
  • 7
    EGR cooler restriction reducing measurable flow.

Symptoms drivers notice

MIL illuminated with P041C stored.
Increased NOx emissions from reduced EGR function.
Rough idle or hesitation during light-load conditions.
Possible slight reduction in fuel economy.
No driveability symptoms in mild cases if EGR is only partially affected.

How to diagnose P041C

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and review freeze-frame data to understand conditions when the fault set.
  2. 2
    View live data for EGR sensor A signal and commanded EGR duty cycle during a drive cycle.
  3. 3
    Inspect the EGR valve for carbon buildup and verify it moves freely through its full range.
  4. 4
    Check EGR passages and cooler for restrictions that would reduce measurable flow.
  5. 5
    Inspect sensor A wiring and connector for corrosion, damage, or loose pins.
  6. 6
    Test sensor A supply voltage and ground at the connector.
  7. 7
    Replace EGR sensor A if mechanically and electrically sound conditions do not restore proper signal correlation.

Vehicles where we've handled P041C

Platforms in our catalogue with confirmed P041C coverage.

BMW 320D
2016

Related powertrain codes

Frequently asked questions

Does P041C affect emissions test results?

Yes. Reduced EGR function increases NOx emissions and the vehicle is likely to fail an emissions inspection.

Can cleaning the EGR valve fix P041C?

Yes, if carbon buildup is preventing the valve from reaching commanded positions, cleaning often resolves the performance deviation.

Is EGR sensor A the same as the EGR valve position sensor?

It depends on the system; some designs use a differential pressure sensor for flow measurement while others use a position sensor on the valve actuator.

Will the engine be damaged if I ignore P041C?

Engine damage is unlikely short-term, but elevated NOx and possible carbon accumulation can harm the EGR system over time.

Disabling P041C in software

RaceTune can permanently disable P041C — 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 P041C 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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