P0107
Manifold Absolute Pressure (MAP) Circuit Low Input
If your code reader dashboard displays the generic DTC error code P0107, your vehicle is currently experiencing an active failure related to "Manifold Absolute Pressure (MAP) Circuit Low Input". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
When your OBD2 scanner shows P0107, the engine control module has flagged an issue specifically related to manifold absolute pressure (map) circuit low input. Typical symptoms include hard starting, stalling, rich exhaust smell. You can typically drive short distances, but ignoring this code long-term will cause accelerated component wear and higher repair costs.
Symptoms
Hard starting, stalling, rich exhaust smell
Common Causes
- Short in MAP wiring
- Defective MAP sensor
- Open signal circuit
- Low fuel pressure
How to Fix
- 1 Test sensor voltage
- 2 Inspect wiring harness
- 3 Replace MAP sensor
- 4 Check fuel pressure
Technical Explanation
Code P0107 is confirmed when the ECM's diagnostic algorithm detects a parameter deviation that persists across a defined number of consecutive drive cycles. The diagnostic runs during closed-loop operation only, ensuring the engine is at full operating temperature and the PCM's fuel trim feedback loop is active before confirming any out-of-range condition. The fault remains stored in memory even after the MIL is cleared; it becomes a confirmed DTC after failing two consecutive drive cycles, and the PCM logs a freeze frame record of the engine's exact operating state at the moment of detection.
Is It Safe to Drive?
Code P0107 allows for cautious short-distance driving, but the underlying cause — most likely short in map wiring — will worsen with time. Fuel economy suffers, and ignoring the fault for weeks can turn a $100 fix into a much larger repair bill.
Mechanic's Pro Tip
When diagnosing P0107, always test fuel volume delivery in addition to static pressure — a pump that holds pressure at idle but delivers insufficient volume under load will cause the fault only during acceleration or high demand, making it difficult to replicate in the driveway. Use a fuel pressure gauge with a volume outlet port: a healthy pump should deliver at least 1 liter per minute. Replace the fuel filter first; it's the cheapest test and solves the fault in a significant percentage of cases.
MAP sensor replacement: $100 - $250