Thermistor Fault - EGR Temperature Sensor
EGR temperature sensor is reporting a fault.
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What it means (plain English)
The EGR temperature sensor measures the temperature of exhaust gas recirculation. If it doesn't read correctly, the engine control module (ECM) can't manage exhaust flow properly, which can affect performance and emissions.
What the computer is actually seeing
The ECM reads voltage from the EGR temperature sensor, expecting to see a range of 0.5V to 4.5V based on temperature. If the reading is too high (over 4.5V) or too low (under 0.5V), a fault code will trigger.
What a healthy reading looks like
The EGR temperature should be between 150°F to 300°F during operation, corresponding to sensor voltage levels 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.
- 11. Inspect the EGR temperature sensor wiring and connectors for damage or corrosion. Decision: If wiring is damaged, repair or replace before further testing. If wiring is okay, proceed to step 2.
- 22. Measure the voltage output from the EGR temperature sensor with a multimeter while the engine is running at operating temperature. Decision: If voltage is outside the 0.5V to 4.5V range, replace the sensor. If within range, proceed to step 3.
- 33. Check for any stored trouble codes (DTCs) in the ECM other than SPN 1416. Decision: If other relevant codes are present, diagnose those first. If no other codes, proceed to step 4.
- 44. Use a scan tool to verify any current software updates for the ECM. Decision: If updates are available, install and retest. If no updates are available, check the ECM ground and power supply.
Common causes
- Faulty EGR temperature sensor
- Wiring issues or shorts in the EGR sensor circuit
- Connector corrosion or damage
- ECM software glitch
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderately safe to drive, but you could experience reduced engine performance and increased emissions.
Will this code come back after clearing?
If the underlying issue isn't resolved, the code will likely return.
Why does this code sometimes pair with SPN 1415?
SPN 1415 also relates to EGR temperature, indicating potential issues with the same sensor or circuit.
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