Intake Manifold Pressure Sensor Voltage Above Normal
The intake manifold pressure sensor is reporting a voltage that is higher than expected.
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What it means (plain English)
The intake manifold pressure sensor measures the pressure in the intake manifold. If it reports a voltage over what the computer expects (usually over 4.5 volts), it can signal a problem either in the sensor, the wiring, or the manifold pressure itself.
What the computer is actually seeing
The ECM sees a high voltage from the intake manifold pressure sensor, indicating pressure readings that exceed expected parameters, usually above 4.5 volts.
What a healthy reading looks like
Normal voltage from this sensor is typically 1-4.5 volts corresponding to intake pressure. Anything above 4.5 volts triggers this fault code.
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 intake manifold pressure sensor wiring for shorts or damage.
- 2Check the connector for corrosion or loose contacts.
- 3Verify the sensor's output voltage with a multimeter; it should range from 1-4.5 volts at sea level under normal operating conditions.
- 4If the voltage is above 4.5 volts, the sensor is likely faulty—replace it and re-test.
- 5If wiring and connection are good but issues persist, inspect for possible boost pressure anomalies or air leaks. Confirm all other related sensor readings.
Common causes
- Wiring issues (short to voltage)
- Faulty intake manifold pressure sensor
- Excessive boost pressure from a turbo
- Faulty ECM reading
- Air leaks in the intake upstream of the sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best not to drive the vehicle for long, as it may affect engine performance and could lead to further damage.
Will this code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why does this code pair with SPN 3191?
SPN 3191 indicates a low voltage condition, and both codes can indicate sensor or wiring problems.
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