Intake Manifold Temperature Circuit
Issues with the intake manifold temperature sensor or circuit.
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What it means (plain English)
The intake manifold temperature sensor measures the temperature of the air in the manifold. If it’s too high or too low, it sends a signal to the engine control module (ECM), which can affect performance.
What the computer is actually seeing
The ECM monitors the voltage from the intake manifold temperature sensor. Normally, this should be about 0.5 to 4.5 volts corresponding to manifold air temperatures from -40°C to 125°C (-40°F to 257°F).
What a healthy reading looks like
Sensor voltage should range between 0.5V (at -40°C) to 4.5V (at 125°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.
- 1Check the wiring and connectors for damage or corrosion at the intake manifold temperature sensor.
- 2Measure the voltage at the sensor connector with the ignition on but engine off. Should be 0.5V to 4.5V depending on air temperature.
- 3If the voltage is out of range, replace the sensor. If in range, check the wiring harness for shorts or broken wires.
- 4Inspect the ECM for faults or updates if the sensor and wiring are functioning properly.
Common causes
- Faulty intake manifold temperature sensor
- Damaged wiring or connectors
- Corroded terminals
- Short circuit to ground or power
- Faulty ECM
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive my vehicle with this code?
Yes, but performance may be affected. It's advisable to address it soon.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved, it will likely return.
Why does this code pair with other SPNs?
This code can be linked to other sensors that monitor temperature and air flow, as they work together for optimal engine performance.
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