Exhaust Gas Temperature Sensor 1 - Circuit High
Exhaust Gas Temperature (EGT) Sensor 1 signal is too high.
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What it means (plain English)
The computer is receiving a voltage from EGT Sensor 1 that is higher than what it expects, indicating a possible short or sensor failure.
What the computer is actually seeing
The engine control module (ECM) sees a voltage reading from the EGT Sensor 1 that is above the normal operating range, often exceeding 2.5 volts.
What a healthy reading looks like
Normal range for EGT Sensor 1 is typically 0.5V to 2.5V; anything over 2.5V triggers the fault code.
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 wiring and connectors for damage or corrosion on the EGT Sensor 1 harness. Check for shorts or open circuits. If damaged, repair/replacement is needed.
- 22. Measure the voltage at the EGT Sensor 1 connector with the ignition on (engine off). If voltage is over 2.5V, the sensor may be faulty or there is a wiring issue. Proceed accordingly.
- 33. If the sensor reading is normal at the connector, check for an exhaust leak before the sensor. Repair any leaks found and clear fault code to retest.
- 44. If all checks pass and fault persists, replace the EGT Sensor 1 and clear the fault code.
Common causes
- Short circuit in the wiring harness
- Faulty Exhaust Gas Temperature sensor
- Corrosion or poor connection at the sensor connector
- Exhaust leaks affecting sensor readings
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's advisable to fix this soon, as it can affect exhaust emissions and performance.
Will the code come back after clearing it?
Yes, if the underlying issue is not fixed, the code is likely to return.
Why is this code paired with other SPN codes?
Other codes may indicate related issues in the exhaust system or temperature readings from additional sensors.
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