Intake Manifold Pressure (MAP) Sensor Voltage High
The engine control unit detects a MAP sensor voltage that is higher than normal.
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What it means (plain English)
The MAP sensor measures the pressure in the intake manifold and sends a voltage signal to the engine control unit. If the voltage is too high, it may indicate a problem with the sensor or its wiring.
What the computer is actually seeing
The ECM typically expects a MAP sensor voltage between 0.5 to 4.5 volts under normal operating conditions. A reading above 4.5 volts indicates a fault.
What a healthy reading looks like
Normal MAP sensor voltage should be around 1-2 volts at idle and increase to about 4.5 volts under full load.
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 for the MAP sensor for damage or corrosion. If found, repair or replace.
- 22. Check the sensor voltage at the connector with the key on and engine off. Expected should be around 0.5 to 4.5 volts. If above 4.5 volts, replace the MAP sensor.
- 33. With the engine running, check the MAP sensor voltage again as RPMs increase. It should vary proportionally. If it remains constant or goes higher than 4.5 volts, check for a possible short in wiring or connections.
- 44. Use a scan tool to check for other related codes and analyze data. If other sensor data indicates issues, investigate accordingly.
Common causes
- Faulty MAP sensor
- Shorted wiring or connector
- Vacuum leaks in the intake manifold
- Electrical issues in the ECU
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended. This code can affect engine performance and may lead to further issues.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, the code will likely return.
Why do I see this code with SPN 6267?
Both codes relate to the MAP sensor; if one is faulty, it often affects the other.
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