Engine Exhaust Temperature Circuit High
The engine control module has detected a high voltage in the exhaust temperature circuit.
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What it means (plain English)
The exhaust temperature sensor is sending too high a voltage signal, indicating it's likely malfunctioning or there's a wiring issue.
What the computer is actually seeing
The engine control module (ECM) receives a voltage reading from the exhaust temperature sensor that exceeds the normal range, typically above 4.8 volts.
What a healthy reading looks like
Normal operational voltage should be between 0.5 to 4.5 volts from the exhaust temperature sensor under ordinary conditions.
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 any visible damage or corrosion. Ensure all connections are secure.
- 22. Measure the voltage at the exhaust temperature sensor connector with the ignition on (engine off). Should be between 0.5-4.5 volts.
- 33. If voltage is above 4.8 volts, disconnect the sensor and check if voltage drops to zero. If it does, sensor is faulty. If not, check harness for short.
- 44. Test the exhaust temperature sensor by applying heat and monitoring the voltage output; it should increase gradually with temperature.
- 55. If all tests point to the sensor being okay, consider checking for ECM updates or malfunctions.
Common causes
- Faulty exhaust temperature sensor
- Damaged wiring or connectors
- Short circuit in the sensor circuit
- Corrosion at electrical connections
- ECM software issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe to drive, but you should resolve it soon to avoid potential overheating or damage to the engine.
Will the code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return after some driving.
Why does this code pair with other temperature codes?
Temperature sensors often share wiring or circuits, leading to multiple codes appearing due to a single fault.
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