EGR Coolant Temperature Sensor - High
The EGR coolant temperature sensor is reading a temperature that is too high.
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What it means (plain English)
The engine control module (ECM) monitors the EGR coolant temperature sensor, which measures how hot the coolant is. If it sees a temperature reading above its acceptable limit, it throws this fault code.
What the computer is actually seeing
The ECM receives a voltage signal from the EGR coolant temperature sensor, which should be between 0.5V to 4.5V based on temperature ranges. If it sees a voltage reading that corresponds to a temperature above 220°F (104°C), it triggers the code.
What a healthy reading looks like
Expected voltage range at normal operation is generally 0.5V to 4.5V with a corresponding temperature between 32°F and 220°F (0°C to 104°C).
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 EGR coolant temperature sensor connector for any damage or corrosion. Repair or clean as necessary. Decision Point: Is the connector good? If no, fix the connector; if yes, move to step 2.
- 22. With the engine running, use a scanner to check the EGR coolant temperature reading. It should be within 32°F to 220°F (0°C to 104°C). Decision Point: Is the reading accurate? If no, replace the EGR coolant temperature sensor; if yes, move to step 3.
- 33. Inspect wiring between the sensor and ECM for shorts or opens. Use a multimeter to measure resistance and continuity. Decision Point: Is the wiring intact? If no, repair the wiring; if yes, move to step 4.
- 44. Check for coolant leaks around the EGR system and ensure fluid levels are normal. Decision Point: Is there a leak? If yes, repair the leak; if no, consider an ECM issue or further testing. Check manufacturer service bulletins for any known issues.
Common causes
- Faulty EGR coolant temperature sensor
- Wiring issues (short or open circuit)
- Faulty ECM
- Coolant leaks affecting temperature readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It is not recommended to drive long distances with this code; monitor engine temperatures as it can lead to overheating.
Will this fault come back after resetting?
It can reappear if the underlying issue is not resolved.
Why does this code appear with SPN 936?
Both codes are related to the EGR system and may indicate similar issues with the coolant temperature sensor or system malfunction.
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