Exhaust Gas Temperature Sensor 1 - Circuit High
This code indicates that the exhaust gas temperature sensor circuit is reporting a high signal.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The exhaust gas temperature sensor measures how hot the gases are coming out of the engine. If the sensor or its wiring sends a signal that's higher than expected, it triggers this code.
What the computer is actually seeing
The engine control module (ECM) sees a voltage from the exhaust gas temperature (EGT) sensor that exceeds the specified range, typically over 4.9 volts for a 5V reference system.
What a healthy reading looks like
A properly functioning EGT sensor should output a voltage between 0.5V (cold) to 2.5V (high temperature).
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 wiring for visible damage. Decision point: If damage is found, repair or replace as needed. If no visible damage, proceed to step 2.
- 22. Check the connector at the EGT sensor for corrosion or looseness. Decision point: If the connector is bad, repair or replace it. If it looks good, proceed to step 3.
- 33. Using a multimeter, measure the voltage at the EGT sensor connector. Expected range is 0.5V to 2.5V. Decision point: If voltage is above 4.9V, replace the sensor. If within range, check for short circuits in the wiring.
- 44. Inspect the wiring harness leading to the ECM for any signs of wear or damage that could cause a short. Decision point: Repair any identified issues and retest the circuit.
Common causes
- Faulty exhaust gas temperature sensor
- Damaged wiring or connectors leading to the sensor
- Short circuit in the EGT sensor circuit
- Corroded or loose connectors
- Engine problems affecting exhaust temperature
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's generally safe to drive, but expect potential performance issues and increased emissions. Get it checked soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will likely return.
Why does this code appear alongside others?
Faulty components can trigger multiple codes related to the exhaust system and temperature readings.
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