Engine Speed Sensor Circuit Voltage High
Indicates a high voltage issue in the engine speed sensor circuit.
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What it means (plain English)
The engine speed sensor detects how fast the engine is running. If this sensor sends a voltage of more than about 5 volts to the computer, it triggers the code.
What the computer is actually seeing
The ECM sees a voltage reading above the expected 0.5 to 4.5 volts from the engine speed sensor.
What a healthy reading looks like
Typical sensor voltage should range from 0.5 to 4.5 volts depending on the engine speed; above 4.5 volts is a problem.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the wiring and connectors for the engine speed sensor. Look for physical damage or corrosion.
- 22. Measure the voltage at the sensor connector with the engine running. If it's above 4.5 volts, proceed to the next step.
- 33. Disconnect the engine speed sensor and check the harness for a short to voltage. Use a multimeter to check for continuity or shorts to power.
- 44. If there are no shorts, replace the engine speed sensor and recheck the voltage.
- 55. If the problem persists, test the ECM wiring and grounding integrity. If faulty, repair or replace as needed.
Common causes
- Shorted wiring in the engine speed sensor circuit
- Faulty engine speed sensor
- Poor connection at the sensor or ECM connector
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but fix it soon as it can affect engine performance.
Will this come back after I clear it?
If the underlying issue isn't resolved, yes, it can return.
Why does this code appear with other engine codes?
Multiple codes can indicate related issues, like wiring problems affecting several sensors.
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