P0107: Manifold Absolute Pressure (MAP) Sensor Circuit Low Input

Quick Summary

1.P0107 Meaning:
P0107 indicates a MAP sensor circuit low input problem. The ECM/PCM detects that the MAP sensor voltage signal is below the expected range.

2.Common Causes:
Common causes include a faulty MAP sensor, damaged wiring, poor connections, vacuum leaks, intake problems, or ECM/PCM issues.

3.Common Symptoms:
Symptoms may include a Check Engine Light, rough idle, stalling, poor acceleration, hard starting, and reduced fuel economy.

4.Diagnosis and Repair:
Diagnosis involves checking the MAP sensor, wiring, vacuum system, voltage readings, and live data. Repairs may require wiring repair, sensor replacement, or fixing air leaks.

5.Related Codes:
Related MAP sensor codes include P0105, P0106, P0108, P0109, and P0068.

What does the P0107 code mean?

P0107 is an OBD-II trouble code that indicates “Manifold Absolute Pressure/Barometric Pressure Circuit Low Input.” The MAP sensor monitors the pressure inside the engine’s intake manifold and converts this information into a voltage signal sent to the powertrain control module (PCM). The PCM interprets this voltage as a pressure reading and uses it to control critical engine functions, including fuel delivery and ignition timing. When the MAP sensor signal voltage falls below the expected range — indicating a pressure reading that does not match normal operating conditions, such as a value lower than the outside barometric pressure — the PCM detects the issue and stores the P0107 code.

What Causes A P0107 Code?

The P0107 code is triggered when the engine control module (ECM) detects that the MAP (Manifold Absolute Pressure) sensor voltage is lower than the expected range. This means the ECM is receiving an incorrect pressure signal, which can affect fuel delivery, ignition timing, and engine performance.

Common causes of a P0107 code include:

1. Faulty MAP Sensor

A damaged or failing MAP sensor may send an incorrect low-voltage signal to the ECM, causing the P0107 code. Internal sensor failure is one of the most common causes.

2. Damaged MAP Sensor Wiring or Connector

Broken wires, corroded terminals, loose connectors, or poor electrical connections can interrupt the MAP sensor signal and cause a low input reading.

3. Short to Ground in the MAP Sensor Circuit

A shorted signal wire can pull the MAP sensor voltage too low, causing the ECM to detect a P0107 fault.

4. Vacuum Leaks in the Intake System

Cracked vacuum hoses, intake manifold leaks, or PCV system problems can create incorrect pressure readings and trigger MAP sensor-related codes.

5. Engine Intake or Airflow Problems

Issues such as a dirty throttle body, restricted air intake, or carbon buildup can affect manifold pressure and cause abnormal MAP readings.

6. Faulty ECM/PCM (Rare)

In rare cases, an internal ECM or PCM problem can prevent the computer from correctly interpreting the MAP sensor signal.

Common symptoms of the P0107 error code

Common symptoms of the P0107 MAP sensor circuit low input code include:

Check Engine Light Turns On

The ECU detects an abnormally low MAP sensor signal and stores the P0107 code, causing the Check Engine Light to illuminate.

Rough Idle or Engine Stalling

Incorrect MAP sensor readings can disrupt air-fuel mixture calculations, leading to unstable idle, engine shaking, or stalling.

Poor Acceleration and Reduced Engine Power

The engine may hesitate, respond slowly to throttle input, or lose power because the ECU receives inaccurate intake pressure data.

Hard Starting

A faulty MAP sensor signal can affect fuel delivery during startup, causing longer cranking time or difficulty starting the engine.

Poor Fuel Economy

Incorrect pressure readings may cause improper fuel adjustments, resulting in increased fuel consumption.

Engine Hesitation or Misfires

An incorrect air-fuel ratio can cause hesitation, surging, or occasional engine misfires during driving.

How to Diagnose the P0107 Code

Perform a Visual Inspection
Inspect the MAP sensor, connector, and wiring harness for damaged wires, corrosion, loose connections, or melted insulation.
Check for Vacuum Leaks
Inspect vacuum hoses and intake manifold connections for cracks or leaks that could affect MAP sensor readings.
Clean the MAP Sensor
Remove dirt or carbon deposits from the MAP sensor using a proper sensor cleaner, as contamination can cause inaccurate readings.
Test MAP Sensor Voltage
Use a multimeter to check the MAP sensor circuit. Verify the 5-volt reference signal, ground connection, and sensor output voltage.
Scan Live Data and Confirm the Repair
Use an OBD2 scanner to monitor MAP sensor readings, clear the P0107 code, and perform a test drive to confirm the issue is fixed.

How to Fix the P0107 Code

Fixing the P0107 code depends on the cause of the low MAP sensor input signal. Common repairs include:

1.Repair or Replace Damaged Wiring
Fix broken wires, corroded terminals, loose connectors, or poor electrical connections in the MAP sensor circuit.

2.Clean or Replace the MAP Sensor
Clean the MAP sensor if dirt or carbon buildup affects readings. Replace the sensor if it fails voltage or performance tests.

3.Repair Vacuum Leaks
Replace cracked vacuum hoses or repair intake manifold leaks that can cause incorrect MAP sensor readings.

4.Check the MAP Sensor Power and Ground Circuit
Repair missing 5V reference voltage, faulty ground connections, or circuit issues between the MAP sensor and ECU.

5.Scan Live Data and Confirm the Repair

Use an OBD2 scanner with live data capability to monitor MAP sensor readings, check freeze frame data, clear the P0107 code, and verify the repair through a test drive.

For example, the Foxwell NT809BT or Foxwell NT614 Elite provides real-time engine data monitoring, allowing technicians to check MAP sensor values, engine parameters, and related diagnostic information without replacing parts unnecessarily.

Tip: Avoid replacing the MAP sensor immediately after seeing a P0107 code. Always inspect the wiring, connectors, and vacuum system first, as electrical or air leaks are common causes of this fault.

Other Codes Related to P0107

Related Code	Description	Possible Issue
P0105	MAP Sensor Circuit Malfunction	General MAP sensor circuit failure, wiring problems, or sensor issues
P0106	MAP/BARO Sensor Range or Performance Problem	Incorrect MAP readings, vacuum leaks, or sensor performance issues
P0108	MAP Sensor Circuit High Input	High MAP sensor voltage caused by wiring faults or a faulty sensor
P0109	MAP Sensor Circuit Intermittent	Intermittent signal caused by loose connections, damaged wiring, or sensor failure
P0068	MAP/MAF Throttle Position Correlation Error	Air intake issues or inconsistent signals between MAP, MAF, and throttle position sensors

P0107 Code Diagnosis by Vehicle Brand

Vehicle Brand	Common Causes of P0107	Diagnosis Focus
Toyota	Faulty MAP sensor, damaged wiring, poor connector connection, vacuum leaks	Check MAP sensor voltage, inspect wiring and connectors, and compare MAP readings with actual engine conditions
Chevrolet	MAP sensor circuit issues, sensor failure, wiring problems, incorrect pressure readings	Test 5V reference voltage, ground circuit, MAP signal output, and check sensor live data
Cummins & Ram 2500 Trucks	MAP sensor contamination, connector corrosion, wiring faults, incorrect intake pressure signals	Inspect MAP sensor condition, check diesel intake pressure readings, and verify live data with a scan tool
Nissan	MAP sensor circuit faults, vacuum leaks, damaged sensor wiring	Check MAP sensor signal voltage and intake pressure readings
Isuzu	MAP sensor failure, electrical connection issues, intake pressure problems	Inspect sensor wiring, connectors, and verify MAP sensor operation
Suzuki	Faulty MAP sensor, poor electrical connections, vacuum-related issues	Test MAP sensor circuit and check for air leaks
Buick	MAP sensor circuit low input, wiring faults, sensor performance issues	Check MAP sensor power, ground, signal voltage, and scan tool data
Mitsubishi	MAP sensor failure, wiring damage, incorrect sensor readings	Inspect MAP sensor circuit and compare sensor data with engine conditions

Can you drive with a P0107 code?

You can usually drive with a P0107 code for a short period, but it is not recommended to ignore it. A faulty MAP sensor signal can cause poor fuel control, reduced engine performance, stalling, or increased fuel consumption.

Diagnosing the issue early helps prevent further drivability problems and avoids replacing parts unnecessarily.

Conclusin

The P0107 code indicates that the ECM/PCM is receiving a MAP sensor signal that is lower than expected. While a failed MAP sensor is a common cause, wiring problems, poor electrical connections, vacuum leaks, and intake system issues can also trigger this fault.

Accurate diagnosis is important before replacing parts. Start by checking the MAP sensor condition, wiring, connectors, and vacuum system, then use a diagnostic scanner to verify MAP sensor readings and confirm the repair.

If the P0107 code appears, avoid replacing the MAP sensor before testing the circuit and sensor readings. Using an OBD2 scanner with live data can help identify whether the issue comes from the sensor, wiring, or intake system. Diagnostic scanners such as Foxwell tools can help monitor MAP sensor data, check engine parameters, and verify that repairs have been completed correctly.

Frequently Asked Questions

1. Can I drive with a P0107 code?

You can usually drive with a P0107 code for a short distance, but it should not be ignored. A faulty MAP sensor signal can cause rough idle, poor acceleration, reduced fuel economy, or engine stalling.

2. Can a dirty air filter cause P0107?

A dirty air filter usually does not directly cause P0107, but a severely restricted air intake can affect airflow and MAP sensor readings. Inspect both the air intake system and MAP sensor circuit during diagnosis.

3. Can a vacuum leak cause P0107?

Yes. A vacuum leak can affect intake manifold pressure readings and cause incorrect MAP sensor data. Check vacuum hoses, intake connections, and the PCV system for leaks.

4. Is P0107 serious?

P0107 is not usually an immediate engine failure code, but it should be diagnosed promptly. Incorrect MAP sensor signals can affect fuel control, engine performance, and drivability.

5. Can P0107 cause rough idle?

Yes. A faulty MAP sensor signal can cause incorrect air-fuel mixture adjustments, leading to rough idle, hesitation, or engine stalling.