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)
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What P00E1 means

DTC P00E1 is set when the engine control module detects a high voltage or out-of-range high signal from the Charge Air Cooler (CAC) Coolant Temperature Sensor A. This sensor is used on forced-induction engines equipped with a liquid-cooled charge air cooler, where it monitors the temperature of the coolant flowing through the intercooler. The sensor is a thermistor whose signal voltage typically rises as temperature drops, so a persistently high reading generally corresponds to an open circuit or a very cold or disconnected sensor state.

A circuit high fault is stored when the ECM reads a signal voltage above the calibrated maximum. The most common causes are an open in the signal or ground wire, a disconnected connector, or an internally failed sensor whose output has drifted or stuck high. Because the reading contributes to charge-air temperature compensation, an implausibly high value can bias the ECM's cooling estimate and, in some calibrations, trigger reduced boost or protective strategies.

Diagnosis begins with live data to see the reported temperature and confirm it is implausible relative to actual conditions. The technician should then check the sensor ground and signal continuity, since an open ground commonly drives the signal high. Inspecting the connector for corrosion or backed-out pins and testing the sensor resistance against specification helps isolate the sensor from the wiring before any part is replaced.

Common causes

Most-frequently reported root causes when P00E1 is logged.

  • 1
    Open circuit in the charge air cooler coolant temperature sensor A signal or ground wire.
  • 2
    Disconnected or poorly seated sensor connector.
  • 3
    Internally failed sensor with output stuck high.
  • 4
    Corroded or backed-out connector pins interrupting the ground path.
  • 5
    Signal wire open due to harness damage or rodent chew.
  • 6
    High resistance in the sensor ground biasing the signal high.
  • 7
    Rarely, an ECM input fault after external causes are excluded.

Symptoms drivers notice

Malfunction indicator lamp illuminated with P00E1 stored.
Scan tool shows charge air cooler coolant temperature reading implausibly high or maxed out.
Possible reduced boost or conservative fuelling in some calibrations.
Minor loss of performance under load in certain vehicles.
Often no strong drivability symptom besides the warning lamp.

How to diagnose P00E1

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and freeze frame data before clearing.
  2. 2
    Observe the charge air cooler coolant temperature in live data and compare against ambient and coolant readings.
  3. 3
    Inspect the sensor connector for corrosion, spread terminals, or a loose fit.
  4. 4
    Check the sensor ground circuit for high resistance or an open.
  5. 5
    Verify signal wire continuity from the sensor connector to the ECM.
  6. 6
    Measure sensor resistance and compare with the temperature-versus-resistance specification.
  7. 7
    Replace the sensor only after wiring, ground, and connector tests are satisfactory.

Related powertrain codes

Frequently asked questions

What subsystem does P00E1 cover?

It covers the charge air cooler coolant temperature sensor on water-cooled intercooler systems, not turbocharger boost control.

Why does an open circuit set a circuit high code?

With this thermistor type, losing the signal or ground lets the ECM read maximum voltage, which it interprets as an out-of-range high condition.

What is the difference between P00E1 and P00E0?

P00E1 is a circuit high fault, typically an open or disconnected sensor, while P00E0 is a circuit low fault, typically a short to ground.

Can I just replace the sensor to fix P00E1?

Not blindly. Open grounds and broken signal wires produce identical readings, so the wiring and connector should be verified first.

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.

ECU families we can disable P00E1 on

We hold the DaVinci A2L disable definitions for these families, so the exact P00E1 path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.

  • Bosch EDC17C66 verified
  • Bosch EDC17CP57 verified
  • Bosch MG1CP002 verified

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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