Exhaust Gas Recirculation (EGR) Cooler Temperature Sensor 1 Low Voltage
EGR cooler temperature sensor reading is too low.
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What it means (plain English)
The EGR cooler temperature sensor is supposed to measure how hot or cold the exhaust gases are after passing through the cooler. If it's showing a very low reading, the sensor might be faulty or there's a wiring issue causing it to read incorrectly.
What the computer is actually seeing
The engine control module (ECM) sees the EGR cooler temperature sensor voltage drop below 0.2 volts, indicating an abnormal condition or sensor failure.
What a healthy reading looks like
EGR cooler temperature should be between 160°F to 212°F (71°C to 100°C) under normal operating conditions, which corresponds to a sensor voltage of approximately 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 the wiring and connector for the EGR cooler temperature sensor for signs of damage or corrosion. Repair or replace as necessary. Decision point: Was any damage found? If yes, repair it and retest.
- 2Check the EGR cooler temperature sensor resistance using a multimeter. It should provide a resistance value that aligns with the expected temperature. Decision point: Is the resistance value within specification? If no, replace the sensor.
- 3Ensure there are no coolant leaks around the EGR cooler that could affect temperature readings. Check coolant level and inspect for leaks. Decision point: Are coolant levels normal? If no, address the coolant issue and retest.
Common causes
- Faulty EGR cooler temperature sensor
- Damaged wiring or connector
- Coolant leaks causing low temperature
- ECM software glitches
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to address this issue soon, but you may still drive the vehicle; however, expect possible performance issues.
Will the code come back after clearing it?
Yes, if the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with SPN 5363?
SPN 5363 relates to the EGR cooler itself, and both codes can appear if there's an issue with the EGR system.
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