Engine Exhaust Gas Temperature Sensor Circuit High
The ECM detected a high signal from the exhaust gas temperature sensor.
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What it means (plain English)
The exhaust gas temperature sensor is seeing a voltage higher than 2.5 volts, which indicates the sensor or its wiring is likely faulty, or there's a problem with the exhaust system.
What the computer is actually seeing
The Electronic Control Module (ECM) monitors the voltage from the exhaust gas temperature sensor; normal operation should have a voltage typically between 0.5 to 2.5 volts during standard operating conditions. A reading above 2.5 volts triggers this code.
What a healthy reading looks like
Expected signal voltage under normal conditions is between 0.5V and 2.5V. A signal above 2.5V indicates an issue.
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. Inspect the exhaust gas temperature sensor and its wiring for damage or corrosion. Decision: If wiring is intact, proceed to step 2; if damaged, repair or replace the wiring.
- 22. Check the voltage at the exhaust gas temperature sensor connector while the engine is running. Expected: Voltage should be between 0.5V and 2.5V. Decision: If voltage is above 2.5V, replace the sensor; if within range, proceed to step 3.
- 33. Verify that the exhaust system is not leaking. Perform a visual inspection and listen for hissing or roaring sounds. Decision: If leaks are found, repair the exhaust system; if none, proceed to step 4.
- 44. Clear the fault codes and test drive the vehicle to see if the code returns. Decision: If the code returns, replace the exhaust gas temperature sensor.
Common causes
- Failed exhaust gas temperature sensor
- Shorted wiring or connectors in the sensor circuit
- Water intrusion or corrosion in the connector
- Exhaust leaks causing abnormal readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It’s drivable but you may experience increased emissions or reduced performance as the ECM may alter engine operation.
Will the code come back after clearing?
Yes, if the underlying issue remains unresolved, the code will likely return.
Why does this code sometimes pair with SPN 2262?
Both codes relate to exhaust gas temperature issues; a faulty sensor circuit can trigger multiple fault codes.
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