Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
There's an issue with the manifold or barometric pressure readings.
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 computer is getting wrong readings from the pressure sensors that help it manage fuel and air intake, affecting overall performance.
What the computer is actually seeing
The engine control module (ECM) expects a certain range for manifold pressure (MAP) and barometric pressure (BARO) signals, typically between 0 to 5 volts for MAP, and it monitors this data closely during operation.
What a healthy reading looks like
MAP sensors typically output between 0.5V (vacuum) and 4.5V (full load), while BARO should be around 1.0V at sea level; a significant deviation indicates a problem.
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.
- 1Check for vacuum leaks around the intake manifold and ensure all hoses are intact. Decision: If leaks are found, repair and retest.
- 2Inspect the wiring and connectors to the MAP and BARO sensors for damage or corrosion. Decision: If damaged, repair or replace and retest.
- 3Using a scan tool, check the MAP and BARO sensor readings at idle. Decision: If readings are outside the expected range (0.5V to 4.5V for MAP; 1.0V for BARO), proceed to the next step.
- 4Test the MAP sensor by applying known pressures using a hand-held vacuum pump. Decision: If the sensor does not respond correctly, replace it and retest.
- 5If the MAP sensor checks out, consider the BARO sensor. Check its data at key-on engine-off (KOEO) and compare with expected values. Decision: If the reading is off, replace the BARO sensor.
Common causes
- Faulty MAP sensor
- Damaged wiring or connectors
- Vacuum leaks
- Faulty barometric pressure sensor
- Issues with the ECM software
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable but may cause reduced engine performance and fuel efficiency; fix soon.
Will this code come back after clearing it?
If the underlying issue isn't fixed, it likely will return.
Does this code always mean a bad sensor?
Not always; check wiring and vacuum leaks first before replacing parts.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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