EGS Voltage Above Normal, or Shorted to High Source
Engine Gas Temperature (EGT) sensor voltage is too high.
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What it means (plain English)
Inside the engine control module (ECM), the Engine Gas Temperature sensor is supposed to send a voltage signal between 0.5 to 2.5 volts. When the voltage exceeds 2.5 volts, it signals an issue.
What the computer is actually seeing
The ECM checks the voltage from the EGT sensor. If it reads above 2.5 volts, it triggers the fault code SPN 1806.
What a healthy reading looks like
Normal EGT sensor voltage should be between 0.5 to 2.5 volts based on operating conditions.
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 EGT sensor wiring for damage or shorts. If damaged, repair the wiring. Decision Point: Is the wiring intact? Yes - proceed. No - repair wiring.
- 22. Check the connector for the EGT sensor. Look for corrosion or loose connections and clean or reconnect as necessary. Decision Point: Is the connector secure and clean? Yes - proceed. No - repair connection.
- 33. Measure the voltage at the EGT sensor connector with the ignition on and engine off. Voltage should be between 0.5 to 2.5 volts. Decision Point: Are values normal? Yes - sensor may be faulty. No - replace EGT sensor.
Common causes
- Shorted wiring to the EGT sensor
- Faulty EGT sensor
- Poor connector connection or corrosion
- Excessive exhaust heat damaging the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to avoid driving until the issue is resolved, as it can affect engine performance and emissions.
Will this code come back after clearing?
It may come back if the underlying issue isn't fixed. A proper diagnosis and repair is necessary.
Why does this code sometimes pair with other codes?
It often pairs with other EGT-related codes, indicating similar sensor or circuit issues.
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