P0109: Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
Can you still drive? Yes, you can drive. The intermittent nature means the car usually runs fine, but have it checked to prevent unexpected stalling.
What Does P0109 Mean?
Code P0109 means the MAP sensor signal is dropping in and out or fluctuating outside of expected parameters intermittently. This is typically caused by a loose electrical connection or a vacuum hose that is partially disconnected. The engine may run normally most of the time with occasional stumbles.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Loose MAP sensor electrical connector
- Intermittent vacuum hose leak
- Corroded MAP sensor wiring pins
- Failing MAP sensor
Symptoms
- Check engine light on intermittently
- Occasional engine hesitation
- Sporadic rough idle
- Intermittent stalling
Diagnostic Steps
- 1Read and document freeze frame data
- 2Inspect MAP sensor connector for looseness or corrosion
- 3Check vacuum hose for cracks or loose fit
- 4Monitor MAP sensor live data while wiggling connector and hose
- 5Replace MAP sensor if intermittent fault continues after wiring repair
Recommended Parts & Tools
electrical contact cleaner
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $30 - $300 |
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Frequently Asked Questions
Why does P0109 come and go?
P0109 is an intermittent code, meaning the MAP sensor signal cuts in and out due to a loose connection, cracked hose, or failing sensor that only acts up under certain conditions.
Is P0109 the same as P0105?
They are related but different. P0105 indicates a general circuit malfunction, while P0109 specifically indicates the signal is intermittent or erratic.
Community Fix Reports
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