P00E2

Turbocharger/Supercharger Boost Control C Circuit High

P00E2 is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control C Circuit High. 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
P00E2
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
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What P00E2 means

DTC P00E2 is the complement to P00E1, set when the ECM detects that the control or feedback signal for Turbocharger/Supercharger Boost Control circuit C has risen above the calibrated maximum threshold. A circuit high condition typically indicates a short to voltage in the signal wiring, an open ground path for the sensor, or a failed sensor or actuator whose output is stuck at the high end of its range.

On solenoid-controlled wastegate systems, a circuit high on the solenoid side can indicate the driver circuit is shorted to battery voltage or the return path is open. On pressure or position sensor feedback circuits, circuit high means the sensor is producing a voltage above the maximum expected value, which can occur when the signal wire contacts a voltage source, the sensor ground is open, or the sensor itself has failed in a high-output mode.

Diagnosis requires a wiring diagram to identify the specific C-circuit component and signal type. Voltage measurements at the component connector with the component disconnected help isolate whether the high voltage originates from the wiring or the component. Always verify ground circuit integrity before condemning a sensor for a high-output fault.

Common causes

Most-frequently reported root causes when P00E2 is logged.

  • 1
    Short to voltage on the C-circuit signal or feedback wire.
  • 2
    Open ground circuit to the C-circuit boost pressure or position sensor.
  • 3
    Failed C-circuit sensor with output stuck at the upper limit.
  • 4
    Damaged wiring harness contacting a voltage source on the C-circuit signal wire.
  • 5
    Corroded or loose sensor ground connection.
  • 6
    Failed ECM pull-up resistor holding the C-circuit signal line high.
  • 7
    Incorrect or incompatible sensor installed on the C circuit with a mismatched output range.

Symptoms drivers notice

MIL illuminated with possible limp mode or boost limiting strategy active.
Live data may show C-circuit sensor at or above maximum scale.
Boost control on the C circuit may be erratic or absent.
Other boost or turbo codes may coexist if the fault affects shared circuits.

How to diagnose P00E2

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and use a wiring diagram to identify the C-circuit component and signal type involved in the high condition.
  2. 2
    With the component connector disconnected, measure voltage on the signal wire; if voltage is still present and high, the wire is shorted to a voltage source in the harness.
  3. 3
    Check the sensor ground circuit resistance to chassis ground; an open ground can bias sensor output high.
  4. 4
    Inspect the C-circuit harness for damaged insulation or areas where the signal wire could contact a power source.
  5. 5
    Test the C-circuit sensor output voltage across its expected input range to determine if it is internally failed high.
  6. 6
    Verify ECM connector pin integrity and absence of moisture or corrosion at the ECM connector for the C-circuit signal pin.
  7. 7
    Replace the sensor or repair wiring only after the root cause of the high-voltage condition is confirmed.

Related powertrain codes

Frequently asked questions

Can a disconnected sensor cause P00E2?

On systems with a pull-up resistor on the signal line, disconnecting the sensor can allow the signal line to float high, potentially setting P00E2. Always check for sensor disconnection as a possible cause.

Is P00E2 the opposite of P00E1?

Yes. P00E1 is circuit low (short to ground or open supply) and P00E2 is circuit high (short to voltage or open ground). They require opposite electrical diagnostic approaches.

Can P00E2 cause over-boost?

Depending on the control strategy, a circuit high on the C-circuit feedback could cause the ECM to incorrectly interpret boost as too low and command higher output, potentially leading to over-boost. The ECM may enter limp mode as a safeguard.

Does P00E2 require replacing the ECM?

Rarely. An ECM fault is the least likely cause. External wiring and component faults account for the vast majority of circuit high conditions.

Disabling P00E2 in software

RaceTune can permanently disable P00E2 — 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.

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