Turbine Inlet Temperature Out of Range
Turbine inlet temperature is outside of the normal range.
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What it means (plain English)
The temperature of the air or gases entering the turbine is too high or too low, which can affect performance and efficiency.
What the computer is actually seeing
The engine control module (ECM) monitors the turbine inlet temperature sensor's signal to ensure it falls within a normal operating range. If the signal is too high (usually over 300°F) or too low (below 32°F) for a defined period, the ECM triggers this fault code.
What a healthy reading looks like
Normal turbine inlet temperatures are generally between 100°F and 250°F (38°C to 121°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. Start with a visual inspection of the wiring and connectors for the turbine inlet temperature sensor. Look for damage, corrosion, or loose connections. If found, repair or replace as needed. DECISION: If all connections are good, proceed to step 2.
- 22. Use a scan tool to check the current reading of the turbine inlet temperature sensor. If the value is not within the expected range (100°F to 250°F), go to step 3. DECISION: If the reading is normal, consider a faulty ECM or wiring issue not visually detectable.
- 33. Perform a temperature check at the turbine inlet using a non-contact thermometer. Compare this with the sensor reading. DECISION: If the sensor reading matches or is close enough (±10°F), replace the sensor. If not, inspect for obstructions or service the turbo system.
Common causes
- Faulty turbine inlet temperature sensor
- Wiring issues or damaged connectors
- Exhaust leaks affecting readings
- Cooling system issues causing abnormal temperature
- Turbocharger malfunction
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's not recommended to drive long distances as it can lead to turbocharger damage if temperatures are not managed.
What will happen if I ignore this code?
Ignoring it can cause decreased performance and may result in more serious issues like turbo failure.
Why does this code pair with others like SPN 1482?
These codes often indicate related issues, such as other temperature sensors or components monitoring the turbo system.
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