EGR Temperature Sensor 1 Circuit Low
The EGR temperature sensor is reporting a low voltage condition.
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What it means (plain English)
The computer monitors the temperature of the exhaust gas recirculation (EGR) system. When the sensor reads below a certain voltage (usually around 0.5 volts), it sets this code to indicate a problem.
What the computer is actually seeing
The engine control module expects a signal voltage from the EGR temperature sensor to range between 0.5V to 4.5V under normal conditions. A reading below 0.5V indicates a fault.
What a healthy reading looks like
Expected voltage from the EGR temperature sensor is between 0.5V to 4.5V.
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.
- 1Inspect wiring and connector integrity between the EGR temperature sensor and ECM. Look for frays or corrosion.
- 2Measure the voltage at the EGR temperature sensor connector with the key on, engine off. Voltage should be above 0.5V. If not, check wiring for shorts or breaks.
- 3If the wiring is good, test the EGR temperature sensor by replacing it with a known good unit (if available) or measuring resistance as per manufacturer specifications.
- 4Clear the code and perform a road test to see if it returns.
Common causes
- Faulty EGR temperature sensor
- Wiring issues (short to ground or open circuit)
- Faulty EGR valve
- Poor connectors or corroded terminals
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but you may notice reduced performance. It's best to fix this issue soon.
Will the code come back after clearing it?
It may return if the underlying issue is not resolved, especially if the sensor or wiring is faulty.
Why does this code pair with other EGR codes?
EGR-related codes often indicate issues with the EGR system, so they frequently appear together.
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