P00E1

Turbocharger/Supercharger Boost Control C Circuit Low

P00E1 is a generic OBD-II powertrain diagnostic trouble code: Turbocharger/Supercharger Boost Control C Circuit Low. 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
P00E1
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
Need P00E1 disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P00E1 means

DTC P00E1 indicates that the control signal or feedback signal for Turbocharger/Supercharger Boost Control circuit C has been detected in a low state beyond the expected operating range. A circuit low fault typically means the ECM measured a voltage on the circuit that is below the calibrated minimum threshold, which can occur due to a short to ground in the control or signal wiring, a failed sensor pulling the line low, or an open in the supply voltage path.

On systems that use a solenoid to control wastegate pressure, a circuit low on the control side can mean the solenoid driver is shorted or the wiring has a low-resistance path to ground. On systems where the ECM monitors a position or pressure sensor for the C circuit, circuit low on the feedback side indicates the sensor output voltage has dropped below the valid range, which can be caused by a sensor failure, wiring fault, or connector issue.

Technicians should use a wiring diagram to determine whether P00E1 relates to the C-circuit control solenoid or a sensor feedback signal, then perform targeted voltage and resistance measurements at the component connector before replacing parts. Verify the supply voltage and ground integrity of the circuit before condemning the sensor or solenoid.

Common causes

Most-frequently reported root causes when P00E1 is logged.

  • 1
    Short to ground in the C-circuit boost control solenoid wiring.
  • 2
    Open circuit in the supply voltage line to the C-circuit sensor or solenoid.
  • 3
    Failed C-circuit boost pressure or position sensor with output stuck low.
  • 4
    Damaged or corroded connector causing a low-resistance path to chassis ground.
  • 5
    Failed ECM output driver for the C-circuit solenoid.
  • 6
    Chafed wiring harness grounding the C-circuit signal wire against chassis or engine components.
  • 7
    Incorrect aftermarket component with incompatible signal range installed on the C circuit.

Symptoms drivers notice

MIL illuminated; possible boost reduction or limp mode.
Boost on the C circuit may be uncontrolled or absent.
Live data may show C-circuit sensor reading at or below minimum value.
Possible additional boost system symptoms such as poor acceleration.

How to diagnose P00E1

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and use a wiring diagram to identify which specific wire or sensor is associated with the C-circuit low condition.
  2. 2
    Measure supply voltage at the C-circuit solenoid or sensor connector with the ignition on.
  3. 3
    Check for a short to ground on the C-circuit signal wire by measuring resistance to chassis ground with the component disconnected.
  4. 4
    Inspect the C-circuit connector and harness for damaged insulation, corrosion, or pinched wires.
  5. 5
    Test the C-circuit solenoid coil resistance and compare to specification.
  6. 6
    If the fault points to a sensor, verify its output voltage across its full operating range before replacing.
  7. 7
    Check ECM driver output only if all external wiring and components test satisfactorily.

Related powertrain codes

Frequently asked questions

What does circuit low mean compared to circuit open?

Circuit low means the measured voltage is below the minimum valid range, typically caused by a short to ground. Circuit open means no voltage path exists, typically caused by a broken wire or open connector. Both can produce similar symptoms but require different repair approaches.

Can a failed ECM cause P00E1?

Yes, but an ECM driver fault is relatively uncommon. Always rule out external wiring and component faults first.

Will disconnecting the C-circuit solenoid clear P00E1?

Disconnecting the solenoid changes the circuit state and may shift the fault to a circuit open code. Use this technique to differentiate between a shorted solenoid and a shorted wire, not as a fix.

Is P00E1 a fire risk?

A sustained short to ground can cause wiring to overheat. Inspect the harness for heat damage and repair any short-to-ground condition promptly.

Disabling P00E1 in software

RaceTune can permanently disable P00E1 — 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 P00E1 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