P00CE

Turbocharger/Supercharger Bypass Valve A Position Sensor Circuit

P00CE is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Bypass Valve A Position Sensor Circuit. 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
P00CE
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on)
Need P00CE disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P00CE means

P00CE is set when the ECM detects a general circuit fault in the position sensor for Turbocharger/Supercharger Bypass Valve A. Not all bypass valves are equipped with a dedicated position sensor; this code applies to systems where a sensor (typically a Hall-effect or potentiometer type) provides direct feedback on valve position, allowing the ECM to operate the bypass valve in a closed-loop manner.

A general circuit fault (as opposed to low, high, or range/performance sub-codes) typically indicates the signal is implausible, erratic, or the sensor circuit has failed in a way that does not fall cleanly into a high or low category. Causes include sensor failure, wiring issues affecting the signal voltage or reference supply, or connector faults. The ECM may fall back to open-loop control of the bypass valve if the sensor is unavailable.

Diagnosis should begin with a scan tool check of the bypass valve position sensor parameter data to determine whether the signal is absent, fixed, or erratic. Following this, the sensor supply voltage, ground, and signal wire should each be verified before the sensor is replaced. ECM-side faults are uncommon but possible if wiring checks are conclusive.

Common causes

Most-frequently reported root causes when P00CE is logged.

  • 1
    Failed bypass valve position sensor.
  • 2
    Damaged or corroded wiring on the sensor signal, supply, or ground circuit.
  • 3
    Short circuit or open circuit in the sensor harness.
  • 4
    Loose or corroded connector at the position sensor.
  • 5
    Loss of sensor reference voltage supply from the ECM.
  • 6
    Contamination of the sensor element by oil or debris.

Symptoms drivers notice

MIL illuminated.
Possible reduction in boost control precision.
Scan tool shows missing, fixed, or erratic bypass valve position data.
Possible compressor surge if the ECM falls back to a suboptimal open-loop strategy.
Other boost management codes may be present concurrently.

How to diagnose P00CE

A typical diagnostic flow when this code is present.

  1. 1
    Record all DTCs and check live data for the bypass valve A position sensor reading.
  2. 2
    With ignition on, verify sensor reference supply voltage at the sensor connector.
  3. 3
    Check sensor ground circuit continuity from the connector to the ECM.
  4. 4
    Inspect the signal wire for damage, chafing, or pinching.
  5. 5
    Measure sensor output voltage at varying commanded positions if possible; compare to manufacturer specification.
  6. 6
    If supply, ground, and wiring are confirmed good and the sensor output remains implausible, replace the position sensor.
  7. 7
    Clear codes and verify with a test drive that the position signal is now within expected range under all operating conditions.

Related powertrain codes

Frequently asked questions

Do all bypass valves have a position sensor?

No. Many bypass valves are controlled open-loop and have no position feedback sensor. P00CE only applies to vehicles equipped with a sensor on Bypass Valve A.

Will P00CE prevent the valve from being controlled at all?

The ECM will typically continue to command the solenoid but may reduce closed-loop precision or limit certain boost management strategies until the sensor fault is resolved.

Can oil contamination affect the position sensor?

Yes. If the intake system has oil carry-over from a PCV fault, the sensor can become fouled, causing erratic or failed readings.

Is P00CE more difficult to diagnose than a simple electrical code?

It can be, because the circuit fault is non-specific. Methodical testing of supply, ground, and signal is required to isolate whether the sensor or wiring is at fault.

Disabling P00CE in software

RaceTune can permanently disable P00CE — 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.

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 P00CE 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