P2EBD: Crankcase Temperature Sensor Circuit High

What it means

The ECM detects a circuit high fault on the crankcase temperature sensor circuit. Reading cannot be used reliably for control.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The crankcase temperature sensor sends a signal to the ECM that varies with temperature. P2EBD sets when the ECM sees the signal circuit remain at an abnormally high electrical level, which can result from a signal wire shorted to voltage, an open circuit or a failed sensor; it does not simply mean the crankcase is too hot.

Common causes

Most likely first.

1. Signal circuit shorted to voltage
2. Open circuit
3. Sensor fault

Symptoms

• Check-engine light
• Rough running or reduced engine performance

How to diagnose it

1. Check freeze-frame and live data to see whether the crankcase temperature reading is implausibly high or fixed at an extreme value.
2. Inspect the sensor connector and harness for disconnected plugs, broken wires, corrosion or damage that could leave the signal circuit open or shorted to voltage.
3. Using the wiring diagram, check the signal circuit for a short to voltage and verify its continuity and terminal contact.
4. Check sensor reference and ground connections and compare circuit readings with the manufacturer’s specification.
5. If the circuit is intact, test the crankcase temperature sensor and replace it only if it fails the manufacturer’s procedure.

Common fixes

• Reconnect a disconnected crankcase temperature sensor plug.
• Repair a signal wire shorted to voltage or an open wire, and restore secure terminal contact.
• Repair a failed sensor ground or reference connection.
• Replace the crankcase temperature sensor if circuit checks pass and the sensor fails testing.

Can I keep driving?

If the engine runs normally, drive gently and arrange diagnosis soon; stop if rough running or reduced power makes the vehicle difficult to control. An unreliable crankcase temperature input can affect engine management and emissions.