Exhaust Gas Temperature Sensor Circuit Low Voltage
The exhaust gas temperature sensor is reading a low voltage signal, indicating a possible issue.
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What it means (plain English)
The exhaust gas temperature sensor measures how hot the exhaust gases are. If it sees a voltage below 0.5 volts consistently, it triggers this code, signaling the PCM that there's a problem.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the exhaust gas temperature sensor typically between 0.5 to 4.5 volts while the engine is running. A reading below 0.5 volts for over 5 seconds will trigger this fault code.
What a healthy reading looks like
Expected voltage range from the exhaust gas temperature sensor is 0.5 to 4.5 volts.
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 exhaust gas temperature sensor connection. Ensure it is secure and free from corrosion or damage. Decision: If damaged, repair or replace.
- 22. Measure the voltage at the exhaust gas temperature sensor connector with the engine running. Expected voltage: 0.5 to 4.5 volts. Decision: If below 0.5 volts, continue to step 3; if normal, the sensor may be bad and should be replaced.
- 33. Inspect the wiring between the sensor and ECM for any signs of damage or corrosion. Continuity testing will help confirm integrity. Decision: If wiring issue is found, repair it; if wiring is good, replace the exhaust gas temperature sensor.
Common causes
- Poor wiring or connector issues
- Faulty exhaust gas temperature sensor
- Oil or soot buildup causing sensor failure
- Open circuit or short to ground in the sensor circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but could affect emissions and performance; fix it soon to avoid further damage.
Will this code come back after clearing it?
It can return if the underlying issue isn't fixed. Check connections and wiring.
Why does this relate to other sensor circuits?
Exhaust temperature affects overall engine management and can trigger multiple related codes if malfunctioning.
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