Invalid Engine Exhaust Temperature Sensor 2 Data
Engine Exhaust Temperature Sensor 2 is providing incorrect readings.
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What it means (plain English)
The computer is seeing a temperature from the exhaust sensor that doesn't make sense; either it's too low or too high compared to what it knows is normal.
What the computer is actually seeing
The ECM expects exhaust temperatures ranging from 300°F to 1200°F (150°C to 650°C) under normal operating conditions. If Sensor 2 shows readings outside of this range or fluctuates rapidly, a fault code is stored.
What a healthy reading looks like
During normal operation, the ECM expects Sensor 2 to report between 300°F (150°C) to 1200°F (650°C) based on engine load and operation.
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 harness and connectors for Engine Exhaust Temperature Sensor 2 for damage or corrosion (look for exposed wires, fraying, or disconnections).
- 2Check for proper operation of the Engine Exhaust Temperature Sensor 2 using a multimeter (should show resistance changes with temperature).
- 3Using a scan tool, monitor the readings from Engine Exhaust Temperature Sensor 2 live while the engine is running; make sure it matches expected exhaust temperature ranges.
- 4Inspect the exhaust system for leaks, especially near Sensor 2, which could alter the readings.
Common causes
- Wiring issue to the sensor (broken wire, short-to-ground)
- Faulty Engine Exhaust Temperature Sensor 2
- Poor connection at the sensor or ECM
- Exhaust system leaks affecting sensor readings
- Overheating issues causing erroneous readings
Typical repair cost
$$-$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
Yes, it's drivable but fix it soon to prevent exhaust system damage.
Will this code come back after clearing?
It might, if the underlying issue isn't fixed.
Why does this code pair with others like SPN 3863?
They often relate to the same exhaust temperature sensor issues or wiring problems.
Working a real vehicle right now?
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