Inlet Manifold Pressure Sensor
The inlet manifold pressure sensor is reporting an out-of-range value.
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 engine's intake manifold pressure sensor tells the computer how much air is entering the engine. If it reads too high or too low, the computer gets confused and doesn't know how to adjust the fuel and air intake for optimal performance.
What the computer is actually seeing
The Engine Control Module (ECM) sees the intake manifold pressure (MAP) sensor's voltage, which should fluctuate between 0.5V (idle pressure) to around 4.5V (boost pressure in turbo systems) depending on engine load.
What a healthy reading looks like
Normal MAP sensor voltage at idle should be around 0.5V to 1.0V, and at wide open throttle (WOT) around 4.0V to 4.5V.
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. Check the vehicle's vacuum lines for leaks; repair any leaks found. Decision: If leaks are present, fix and retest. If no leaks are found, proceed to step 2.
- 22. Inspect the MAP sensor wiring harness and connectors for corrosion or damage; repair or replace any faulty wiring/connectors. Decision: If wiring is damaged, fix and retest. If wiring is fine, move to step 3.
- 33. Use a scan tool to read the MAP sensor values while the engine is running; at idle, it should read between 0.5V to 1.0V. Decision: If readings are within range, proceed to check the ECM. If not, replace the MAP sensor and retest for proper operation.
- 44. If the MAP sensor is new but values are still out of range, check the ECM for proper functioning and software updates. Decision: If ECM appears to be faulty, consider a reprogram or replacement.
Common causes
- Faulty MAP sensor
- Vacuum leak in the intake manifold
- Wiring issues or corroded connectors
- ECM software issue
- Clogged intake or exhaust
- Issues with boost pressure (in turbo vehicles)
Typical repair cost
$$
Related codes
Frequently asked questions
Can I still drive the vehicle with this code?
Yes, but expect reduced engine performance and efficiency. Repair soon.
Will this code return after I clear it?
It may return if the underlying issue isn't fixed; repeat diagnostics if it does.
Why does this code sometimes pair with SPN 225?
SPN 225 is often related to the same sensor issue, indicating pressure fluctuates excessively.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →