Quick answer: The P0107 code indicates that your vehicle’s Engine Control Module (ECM) receives a lower-than-normal voltage signal from the Manifold Absolute Pressure (MAP) sensor. This directly affects the air-fuel mixture and ignition timing systems. While not immediately catastrophic, you should address it promptly to avoid poor drivability and potential engine damage.
Seeing an engine light pop up with code P0107 can be concerning, especially if your vehicle starts idling rough or losing power. This code points to an issue with your engine’s MAP sensor circuit, which measures intake manifold pressure to help calculate proper fuel delivery. In this guide, we will break down what causes this fault, how to diagnose it step-by-step, and what repairs typically cost.
What Does P0107 Mean?
The MAP sensor measures the vacuum level inside your engine’s intake manifold and sends a variable voltage signal to the ECM-typically between 0.5 and 4.5 volts depending on load. When code P0107 sets, it means the sensor’s voltage reading has dropped below its normal minimum operating threshold (usually under 0.25 volts) for a specified period. The engine computer interprets this excessively low voltage as extremely high intake vacuum or, more commonly, a circuit failure such as a broken wire, disconnected plug, or an internal sensor failure.
Symptoms
- Check Engine Light remains illuminated
- Rough or erratic engine idling
- Engine hesitation or stumbling during acceleration
- Engine stalling, especially when slowing down to a stop
- Increased fuel consumption and a strong smell of unburned gas
- Misfires or dark exhaust smoke
Possible Causes
Many drivers immediately purchase a new MAP sensor, but a bad wiring connection or a damaged plug is often the real culprit behind low voltage codes.
- Disconnected or loose MAP sensor wiring harness connector
- Damaged, shorted to ground, or corroded MAP sensor wiring
- Clogged, cracked, or disconnected vacuum line supplying the MAP sensor
- Faulty MAP sensor failing to return signal voltage
- Faulty Engine Control Module (ECM) or outdated engine software
Check These Yourself Before Visiting a Mechanic
- Inspect the connector: Locate the MAP sensor on your intake manifold and ensure the electrical connector is firmly clicked into place and free of corrosion or bent pins.
- Examine the vacuum line: Check any small rubber hose running to the MAP sensor for cracks, splits, or blockages.
- Look for visible wiring damage: Check the wire harness leading to the sensor for obvious fraying, melt marks, or spots where wires have rubbed against metallic engine parts.
How to Fix It
- Connect an OBD-II scanner to confirm P0107 and check for any related circuit or reference voltage codes.
- Perform a physical inspection of the MAP sensor plug, wiring, and vacuum supply lines.
- Use a digital multimeter to verify that the MAP sensor connector receives a 5-volt reference signal and proper ground from the ECM.
- Test the signal wire output voltage with the ignition key turned on (engine off); it should read near 4.5 to 5.0 volts at sea level.
- If 5V reference and ground are present but signal output stays near 0V, replace the faulty MAP sensor.
- Clear the error code using your scan tool and complete a test drive to confirm the repair.
Estimated Repair Costs (2026)
| Job | Parts ($) | Labor ($) |
|---|---|---|
| Vacuum Hose Repair / Replacement | $5 – $20 | $50 – $100 |
| Wiring Harness Repair | $10 – $30 | $100 – $200 |
| MAP Sensor Replacement | $30 – $120 | $50 – $100 |
| ECM Replacement (Rare) | $400 – $900 | $150 – $300 |
[Note: these are 2026 estimates in US dollars; costs vary by make and model.]
Frequently Asked Questions
Can I drive with the P0107 code?
You can usually drive short distances to safety, but prolonged driving is not recommended. The engine will run on backup baseline fuel maps, which can cause severe rich or lean conditions, engine stalling, and potential long-term damage to your catalytic converter.
How do I clear the P0107 code?
After fixing the underlying wiring or replacing the faulty sensor, plug an OBD-II scanner into the vehicle’s diagnostic port and select ‘Clear Codes’. Alternatively, completing several normal drive cycles may automatically turn off the light once the computer detects normal circuit voltage.
Can a bad vacuum leak trigger code P0107?
While severe intake vacuum leaks usually cause high-voltage MAP codes (low vacuum), a pinched, clogged, or disconnected vacuum hose going directly to the sensor port can prevent manifold pressure changes from reaching the sensor, resulting in improper circuit readings.