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)
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What P00E2 means

DTC P00E2 is set when the engine control module detects an intermittent or erratic signal from the Charge Air Cooler (CAC) Coolant Temperature Sensor A. Unlike a steady circuit-low or circuit-high fault, this code indicates that the signal is jumping, dropping out, or fluctuating in a way that is inconsistent with a genuine temperature change. It is most commonly a wiring or connection problem rather than an internally failed sensor.

The charge air cooler coolant temperature sensor is a thermistor used on liquid-cooled intercooler systems to report the coolant temperature entering the charge air cooler. The ECM uses this to estimate charge-air cooling and adjust fuelling and boost strategies. When the signal behaves erratically, the ECM cannot trust the value, so it flags this fault. Loose terminals, chafed wiring, vibration-sensitive connections, and moisture in the connector are typical triggers, and the fault frequently comes and goes with engine movement or temperature cycling.

Because the fault is intermittent, diagnosis relies on capturing the glitch. Technicians should record live data while wiggle-testing the harness and connector, since the reading will spike or drop when the bad connection is disturbed. Inspecting for corrosion, spread pins, and coolant intrusion at the connector is essential. The sensor itself should only be replaced after the wiring and connections are confirmed stable, as a good sensor is often wrongly condemned in erratic-signal cases.

Common causes

Most-frequently reported root causes when P00E2 is logged.

  • 1
    Loose or corroded charge air cooler coolant temperature sensor connector.
  • 2
    Intermittent open or short in the signal wiring from vibration or chafing.
  • 3
    Spread or backed-out terminal pins losing contact under movement.
  • 4
    Moisture or coolant intrusion into the sensor connector.
  • 5
    Marginal internal sensor connection causing erratic output.
  • 6
    Poor ground or supply connection that drops out intermittently.
  • 7
    Rarely, an ECM input fault after wiring is ruled out.

Symptoms drivers notice

Malfunction indicator lamp illuminated, sometimes intermittently, with P00E2 stored.
Charge air cooler coolant temperature in live data jumps or drops erratically.
Fault may appear and clear on its own between drive cycles.
Occasional conservative fuelling or boost when the reading glitches.
Usually little or no consistent drivability complaint.

How to diagnose P00E2

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve all DTCs and note whether the code is current or intermittent.
  2. 2
    Monitor charge air cooler coolant temperature in live data during a road test or while running the engine.
  3. 3
    Perform a wiggle test on the connector and harness while watching for sudden spikes or dropouts.
  4. 4
    Inspect the connector for corrosion, spread pins, moisture, or coolant intrusion.
  5. 5
    Check signal, ground, and supply wires for intermittent continuity by flexing the harness.
  6. 6
    Repair or reseat any loose or damaged connections found.
  7. 7
    Replace the sensor only if the signal remains erratic with confirmed-good wiring.

Related powertrain codes

Frequently asked questions

What does an intermittent or erratic code like P00E2 mean?

It means the charge air cooler coolant temperature signal is fluctuating unpredictably, usually pointing to a loose or damaged connection rather than a steady sensor failure.

Why is P00E2 hard to diagnose?

The fault may not be present when you inspect the vehicle, so it often requires wiggle-testing the harness while watching live data to catch the glitch.

Is P00E2 related to turbocharger boost control?

No. It concerns the charge air cooler coolant temperature sensor on liquid-cooled intercooler systems, not a boost control actuator.

Should I replace the sensor first?

No. Because erratic signals are usually wiring related, the connector and harness should be checked and repaired before replacing the sensor.

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.

ECU families we can disable P00E2 on

We hold the DaVinci A2L disable definitions for these families, so the exact P00E2 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 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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