Engine performance is dependent on ignition timing and the air-fuel ratio. The Engine Control Module (ECM/PSM) calculates both using information transmitted by various sensors, such as air intake, fuel injection, engine, and exhaust systems.The MAP or BARO sensor measures the pressure in the intake manifold and the barometric/atmospheric pressure relative to the vehicle. The sensors send voltage signals to the ECM based on engine load or operating conditions. The P0108 code is recorded by the ECM if it detects that these sensors send signals above the normal range.
Honda (especially the Accord), Ford and Chevrolet are the models most susceptible to the P0108 error code.
Other fault codes related the MAP sensor are: P0105-P0106-P0107-P0109
Table of Contents
What are the causes of fault code P0108?
- Faulty or worn MAP/BARO sensors
- Short circuits in the signal cables to/from ECM
- Leakage in the vacuum lines leading to the MAP Sensor
- Catalytic converters that are faulty, damaged or blocked
- Low vacuum caused by worn engine
- In rare instances, an ECM that is faulty can cause the vehicle to malfunction
What are the symptoms of fault code P0108?
- Engine fault light illuminating
- Engine performance issues
- Vehicle starts with difficulty
- Uncontrolled acceleration or engine hesitation during acceleration
- Stuttering or stalling of the engine
- Fluctuations of idle speed
- A problem with the MAP Sensor can cause your vehicle to have a disrupted air/fuel ratio, resulting in increased fuel consumption.
- Black smoke from the exhaust
How to Fix Fault Code P0108?
- Before performing any operation, reset the codes. The vehicle will begin to function properly once the codes have been cleared. Test the procedure again if the fault code appears.
- Check the sensor cables, connector connections and the connector cable. To ensure a new connection, disconnect the electrical connector from the vehicle and reconnect it.
- Restore the cables if they are frayed or crushed.
- Check the cables that go to/from your ECM. Test the cables by moving them around.
- Check for possible leaks in all vacuum hoses. If there are holes or tears, replace the hose.
- Test the MAP sensor voltage output to make sure it’s within the right range, fluctuates according to engine speed and has the right voltage. The voltage at idle should be between 1.5 and 1 volts, depending on the altitude. At full throttle, it is usually around 4.5 volts. If the voltage rises rapidly from 2 volts when idle to 5 volts, or more, then the MAP sensor may be faulty.
- Purchase a new MAP or ECM/ECU only after the exact cause of the problem has been determined.
- Replace the MAP Sensor if all tests are satisfactory.
- If the problem persists, it is recommended that the ECM be checked.
How serious is fault code P0108?
The engine runs irregularly when the fault code P0108 is present. This requires immediate attention. The MAP sensor has a high voltage issue that can cause excessive fuel consumption, poor engine performance, backfiring, and difficulty starting in certain conditions. Continued driving in this condition may cause further damage.
