P0107 — Manifold Absolute Pressure/Barometric Pressure Circuit Low #

Note: The definition of this code may vary depending on the vehicle manufacturer.

• MAP Sensor Circuit Low Voltage (General Motors)
• Manifold Absolute Pressure Sensor Signal Low Input (Ford)
• Barometric Pressure Sensor Circuit Low Input (Honda)
• MAP Sensor Circuit Voltage Below Threshold (Toyota)

Summary of Code P0107 #

The P0107 diagnostic trouble code (DTC) indicates that the Manifold Absolute Pressure (MAP) sensor or the Barometric Pressure (BARO) sensor is registering a voltage input to the Engine Control Module (ECM) that is lower than the factory-specified threshold. The MAP sensor measures the pressure inside the intake manifold, which helps the ECM calculate the appropriate air-fuel mixture and ignition timing. When this signal is abnormally low, it can impact engine performance, fuel economy, and emissions. This code is common across many makes and models, and its detection prompts the ECM to trigger the Check Engine Light and enter a default operating mode. Prompt attention to this code is important to avoid further drivability issues or potential engine damage.

Common Symptoms for Code P0107 #

When P0107 is stored, drivers may notice several performance issues. The ECM may enter a fail-safe or “limp” mode to protect the engine, resulting in noticeable changes in how the vehicle drives. If you experience any of these symptoms, it’s best to have the vehicle checked as soon as possible:

• Check Engine Light illuminated on the dashboard
• Engine may be hard to start or may not start at all
• Poor acceleration or lack of power
• Rough idle or engine stalling
• Reduced fuel efficiency
• Black smoke from the exhaust (in rare cases)

Probable Causes for Code P0107 #

There are several likely reasons why a P0107 code will appear, but some causes are more common than others. Understanding the root cause will help you focus your diagnostic efforts efficiently. Here are the most frequent causes, ranked by how often they occur:

1. Faulty MAP sensor: The sensor itself has failed or is sending incorrect signals.
2. Wiring problems: Damaged, corroded, or disconnected wiring/connectors in the MAP sensor circuit.
3. Vacuum leaks: Cracked, disconnected, or leaking vacuum hoses at the intake manifold or sensor.
4. ECM issues: Rarely, the Engine Control Module may have an internal fault affecting sensor readings.
5. Sensor ground or reference voltage issues: Poor ground or voltage supply to the sensor.

Step-by-Step Diagnostic for Code P0107 #

A systematic approach is vital for diagnosing P0107 accurately. Here’s a proven step-by-step process followed by professional technicians and OEM service manuals:

1. Check for additional codes: Scan the ECM for other related DTCs (especially those involving intake, sensor, or wiring issues).
2. Inspect the MAP sensor and connector: Look for signs of damage, corrosion, or loose connections at the sensor and its harness.
3. Test sensor voltage: Use a digital multimeter to check the MAP sensor’s output voltage with ignition ON; compare values to manufacturer specifications (typically 4.5–5V with key ON, engine OFF).
4. Check wiring continuity: Inspect the harness for breaks, shorts, or corrosion between the sensor and the ECM.
5. Inspect vacuum hoses: Look for cracked, disconnected, or deteriorated hoses at or near the MAP sensor and intake manifold.
6. Test ECM input: If all else checks out, measure MAP sensor signal at the ECM connector to rule out wiring or ECM faults.

Possible Repairs for Code P0107 #

Once you’ve pinpointed the cause of P0107, the solution will directly correspond to your findings. Here are the most effective repairs:

• Replace the MAP sensor if it fails voltage or resistance tests or shows internal damage.
• Repair or replace damaged wiring/connectors in the sensor circuit.
• Replace or repair vacuum hoses that are leaking, cracked, or disconnected.
• Clean the MAP sensor port if it’s clogged with debris or oil.
• Replace or reprogram the ECM if all other steps fail and the control module is confirmed faulty (rare).

Can You Drive with Code P0107? #

Driving with code P0107 is not recommended for extended periods. While the vehicle may continue to run, engine performance and fuel efficiency will be compromised. In some cases, the engine may stall or refuse to start, which could leave you stranded. For your safety and to avoid further damage, have this issue diagnosed and repaired as soon as possible.

Vehicles Most Commonly Affected by Code P0107 #

While P0107 can affect any vehicle equipped with OBD-II and a MAP sensor, it is more frequently reported on certain models, especially those with higher mileage or known sensor issues. The following vehicles are commonly associated with this code:

• Chevrolet Silverado, Malibu, and Impala
• Ford F-150, Focus, and Escape
• Honda Accord and Civic
• Toyota Corolla and Camry
• Hyundai Elantra and Sonata
• Kia Optima and Soul
• Dodge Ram and Caravan

Common Mistakes & Best Practices for Code P0107 #

Even experienced technicians can make mistakes when diagnosing P0107. Avoid these pitfalls and follow best practices for reliable repairs:

• Replacing the MAP sensor without checking wiring, connectors, or vacuum hoses first.
• Overlooking intermittent wiring faults that may only occur under certain conditions.
• Ignoring related DTCs that could help pinpoint the root cause.
• Failing to clear the code and retest after repairs.
• Using non-OEM (aftermarket) sensors that may not meet manufacturer specifications.

Quick FAQ for Code P0107 #

Here are answers to a couple of the most common questions about P0107:

• Q: Can a dirty MAP sensor cause P0107?
  A: Yes. If the sensor port is clogged with oil, carbon, or debris, it can reduce the voltage signal and trigger this code.
• Q: Will replacing the battery clear P0107?
  A: No. Disconnecting the battery may temporarily clear the code, but the underlying issue will remain and the code will return until properly diagnosed and repaired.