Intake Manifold Temperature Sensor 1 Voltage Too High
The voltage from the intake manifold temperature sensor is above the expected range.
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What it means (plain English)
The computer checks the intake manifold temperature using a sensor. If the voltage signal from that sensor goes over 4.5 volts, the computer thinks something's wrong and trips this code.
What the computer is actually seeing
The Engine Control Module (ECM) sees the input voltage from the manifold temperature sensor exceeds 4.5 volts—this is too high for normal operation.
What a healthy reading looks like
Normal voltage should range from 0.5 to 4.5 volts depending on the temperature, which typically should be around 100 to 200 degrees Fahrenheit during 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.
- 11. Inspect wiring and connectors for damage or corrosion. Fix any issues found. Decision Point: If wiring/connectors are fine, proceed to step 2.
- 22. Check the intake manifold temperature sensor voltage with a multimeter. Expected readings are between 0.5V and 4.5V. Decision Point: If voltage is out of this range, replace the sensor. If within this range, proceed to step 3.
- 33. Inspect for any intake manifold leaks that could affect temperature readings. Use smoke testing if necessary. Decision Point: If leaks are found and fixed, clear codes and test drive. If no leaks, continue to step 4.
- 44. Check the ECM for faults or updates, as a malfunctioning ECM may misinterpret sensor readings.
Common causes
- Faulty intake manifold temperature sensor
- Wiring issues (short circuit or open circuit)
- Corroded or loose connectors
- Intake air leaks
- ECM malfunction
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally safe as long as the engine runs properly, but reduce load and monitor performance.
Will this code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return.
Why does this code sometimes pair with other codes?
Multiple codes can indicate related issues, such as temperature sensors linked to wiring or manifold problems.
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