Engine Intake Manifold Pressure Sensor Fault
Indicates a fault in the engine intake manifold pressure sensor circuit.
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What it means (plain English)
The engine computer is having trouble reading the pressure in the intake manifold. This can lead to performance issues because the engine doesn't know how much air is coming in.
What the computer is actually seeing
The ECM expects to receive a continuous voltage signal from the intake manifold pressure sensor, typically a range around 0.5 to 4.5 volts depending on the engine load. If the signal drops below 0.1 volts or goes above 4.7 volts, or if the sensor fails to respond, it triggers this fault code.
What a healthy reading looks like
Normal operation shows the sensor voltage between 0.5V (idle) and 4.5V (full throttle).
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 to the intake manifold pressure sensor for damage or corrosion. Fix any issues found.
- 22. Check for a vacuum leak in the intake manifold. Use a smoke machine or spray soapy water to identify leaks.
- 33. Measure the voltage at the sensor connector with a multimeter while the engine is running. Confirm it’s within the expected voltage range (0.5V - 4.5V). If not, replace the sensor.
- 44. If the sensor voltage is normal, use a scan tool to command the ECM to read and display the pressure temporarily. If readings are incorrect or absent, test or replace the ECM.
Common causes
- Faulty intake manifold pressure sensor
- Wiring or connector issues
- Vacuum leaks
- ECM failure
- Blocked intake manifold passages
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, it's drivable but performance may be affected. Fix soon.
Will this code clear itself?
Not typically. You usually need to repair the issue and clear the code manually.
Why does this code sometimes pair with SPN 1894?
SPN 1894 indicates a similar circuit issue related to the sensors, often leading to multiple codes when there's a shared wiring problem.
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