Engine Exhaust Temperature Sensor 1 Circuit High
The Engine Exhaust Temperature Sensor 1 is reporting a high voltage condition.
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 sensor measuring how hot the exhaust is has sent a signal that is higher than normal, indicating a potential malfunction or bad connection.
What the computer is actually seeing
The ECM expects the Engine Exhaust Temperature Sensor to output a signal between 0.5 to 4.5 volts. If it sees a voltage higher than 4.5 volts, it sets this SPN.
What a healthy reading looks like
0.5V to 4.5V from the sensor; anything above 4.5V indicates 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.
- 1Check the exhaust temperature sensor wiring for damage or corrosion.
- 2Measure the voltage at the sensor connector while the engine is running. Is it above 4.5 volts?
- 3Inspect the sensor for physical damage or evidence of exhaust leaks near the sensor. Is it damaged?
- 4If the wiring and sensor are good, use a scan tool to check for other codes related to the exhaust system.
Common causes
- Faulty Engine Exhaust Temperature Sensor
- Wiring harness short to voltage
- Bad ECM (Engine Control Module)
- Corroded connectors or terminals
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
You can drive the vehicle, but monitor for any performance issues or check engine light behavior.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it will likely return.
Why does this code show up with other exhaust-related codes?
Exhaust temperature sensors are critical in emissions control; issues here can trigger multiple codes if there’s a systemic problem.
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