Intake Manifold Pressure Sensor Voltage High
The manifold pressure sensor is sending a high voltage signal to the ECM.
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What it means (plain English)
The intake manifold pressure sensor measures how much air is in the engine's intake. If it sends a voltage higher than what is normal, it can confuse the engine control module about how efficient the engine is running.
What the computer is actually seeing
The engine control module (ECM) receives a voltage signal from the intake manifold pressure sensor that exceeds 4.5 volts when under normal operating conditions, indicating a potential sensor failure or electrical short.
What a healthy reading looks like
Normal voltage should range between 0.5 to 4.5 volts depending on the actual manifold pressure; a reading above 4.5 volts triggers this 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.
- 11. Inspect the wiring and connector at the intake manifold pressure sensor for damage, corrosion, or loose connections.
- 22. Measure the voltage at the sensor connector with the engine running; it should be between 0.5 to 4.5 volts. If it's above 4.5 volts, go to step 3. If it's within range, the sensor and wiring are likely okay.
- 33. Check the ground circuit of the sensor; ensure it has good continuity back to the ECM. If the ground is good, replace the intake manifold pressure sensor.
- 44. If voltage readings are high, inspect for short circuits in the sensor circuit. Check against a wiring diagram if necessary.
Common causes
- Faulty intake manifold pressure sensor
- Wiring issues or shorts in sensor circuit
- Poor connections at the sensor or ECM
- Corroded electrical connectors
- Vacuum leaks affecting manifold pressure readings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
It's best to fix this code promptly as it can impact engine performance and fuel efficiency.
Will this fault code come back after repair?
If the repair was done correctly and any underlying issues were fixed, this code should not return.
Why does this code pair with other codes?
Common issues such as a faulty sensor or wiring problems can trigger multiple related codes.
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