Intake Manifold Pressure - Circuit Range/Performance Problem
Problem with the intake manifold pressure sensor or circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The intake manifold pressure sensor measures how much air is in the engine's intake. If it sees readings that are too high or low compared to what it expects, there's a problem with the sensor or the air intake system.
What the computer is actually seeing
The engine control module (ECM) expects the manifold pressure to fluctuate based on engine load and RPM. It typically looks for readings between 30-100 kPa (kilopascals) under normal conditions. If readings are out of this range for a preset duration, it triggers a fault.
What a healthy reading looks like
Normal pressure values should be between 30-100 kPa under varying engine loads; less than 25 kPa or more than 120 kPa can trigger 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 to the intake manifold pressure sensor for damage or corrosion. If found, repair or replace as needed. Decision: If wiring is good, proceed to step 2.
- 22. Check the manifold pressure sensor’s output. Use a multimeter to measure voltage; it should vary with engine RPM (typically 0.5V - 4.5V). Decision: If voltage is out of range, replace the sensor, if in range, proceed to step 3.
- 33. Perform a smoke test on the intake system to check for vacuum leaks. Decision: If leaks are found, repair them, then retest. If no leaks, proceed to step 4.
- 44. Monitor the engine with a scan tool for real-time data. Check if the readings match the expected values. Decision: If not, consider replacing the ECM.
Common causes
- Faulty intake manifold pressure sensor
- Wiring harness issues
- Vacuum leaks in the intake system
- Obstructed intake passages
- ECM software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s drivable, but fix it soon to avoid reduced performance.
Will this code come back after clearing?
Yes, if the underlying issue isn't resolved.
Why does it pair with other codes like SPN 1150?
These codes often indicate related issues in the intake system.
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