Intake Manifold Temperature Too High
The intake manifold temperature is higher than expected during engine operation.
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What it means (plain English)
The engine's computer is detecting that the air temperature coming into the engine is too high, which can negatively affect performance and efficiency.
What the computer is actually seeing
The engine control module (ECM) monitors the intake manifold temperature via a sensor. If the temperature exceeds a preset threshold, often around 80°C to 120°C (176°F to 248°F), it triggers this fault code.
What a healthy reading looks like
Intake manifold temperature should typically stay below 90°C (194°F) under normal 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 wiring and connector for the intake manifold temperature sensor. Look for damage, corrosion, or loose connections. If faults are present, repair them.
- 22. Use a scan tool to check the intake manifold temperature reading. Compare the reading with actual measured temperatures using a digital thermometer. If they don’t match, replace the sensor.
- 33. Check for any possible sources of excessive heat nearby, like a malfunctioning turbo or poor under-hood airflow. Fix any identified heat sources.
- 44. If problems persist, check the engine tuning or modifications for any issues that might be causing abnormal temperature readings.
Common causes
- Faulty intake manifold temperature sensor
- Wiring or connector issues to the temperature sensor
- Heat-soak from nearby components or turbocharger
- High under-hood temperatures due to poor ventilation
- Improper engine tuning or modifications
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I drive with this code active?
Yes, but be aware that performance may be degraded, and it could lead to engine damage over time.
Will this code come back after clearing it?
If the underlying issue isn’t resolved, yes, it will likely return.
Why does this code sometimes pair with SPN 2687?
Both codes relate to intake temperature issues, indicating different operational thresholds or sensor faults.
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