P0108 OBD Error Code: Problem & Solutions

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Are you experiencing diminished fuel efficiency? Is your engine giving issues during cold start? Is the car engine stalling and losing acceleration? All these can be the indication of OBD Code P0108.

OBD-II Code P0108 is defined as a Manifold Absolute Pressure Sensor/Barometric Pressure Circuit High Input

The MAP (Manifold Absolute Pressure) sensor measures engine manifold negative air pressure. It's usually a three-wire sensor: a ground wire, a 5-volt reference wire from the PCM (Powertrain Control Module) to the MAP sensor, and a signal wire that informs the PCM of the MAP sensor voltage reading as it changes. The higher the engine vacuum, the lower the voltage reading. The voltage should range between about 1 volt (at idle) to about 5 volts (WOT wide open throttle). If the PCM sees the voltage reading from the MAP sensor is greater than 5 Volts, or if the voltage reading is higher than what the PCM considers normal under certain circumstances, a P0108 DTC will set.

What causes the problem of Manifold Absolute Pressure Sensor/Barometric Pressure Circuit High Input?

• Faulty MAP (Manifold Absolute Pressure) sensor
• Contaminated/Damaged MAF/VAF sensor
• Damaged wiring or connectors that may be short or open
• Breakage and leaky air inlet pipe
• Problematic Engine Vacuum Pump
• Faulty PCM that may require replacement or reprogramming
• Poor electrical connection of sensor or circuit

1. Diagnostic Tools - Buy pro grade professional tools to solve OBD error P0108. Buy professional diagnostic tools now!
2. Mass Air Flow Sensor - Any problem with the MAF sensor can affect the engine performance and the system will not be able to manage the air to fuel ratio properly. Buy new MAF sensor now!
3. Throttle Position Sensor - If the TPS is damaged or faulty, it will result in loss of engine power and acceleration along with reduced fuel economy. Replace it immediately, if faulty.
4. Catalytic Converter - If the catalytic converter is damaged, it will affect the fuel delivery and the air intake system respectively. Also, it may result in increased emission from the exhaust. Thus, it becomes important to replace faulty catalytic converter immediately.
5. Manifold Absolute Pressure Sensor - MAP sensor at fault can cause increased fuel consumption, lack of power and failing an emission test. Thus, replace it now!
6. EGR Valve & Parts - Poor engine performance and rough idles are the first symptoms of bad EGR system and parts. Replace them now!
7. PCV Valve - Faulty PCV valve can cause engine surges and possible black smoke emission from the tailpipe. Thus, replace it now!
8. Throttle Body - Throttle body is a really important component that helps the air intake system and controls the airflow in the engine. Check for faulty parts and replace them now!

This P0108 error may cause reduced power, the engine may run rough, or the engine may crank but not start. There is typically an illuminated Check Engine light as well. Visit Parts Avatar Canada to get genuine replacement parts and performance parts for your vehicle available for all makes and model be it Volvo, Chevrolet, Ford, Dodge, Porsche, Ford, Land Rover, Audi, Hyundai, Fiat, etc. This error may also indicate problems that will likely affect:

Common Symptoms

• Loss of engine power and acceleration
• Exhaust being rich and lean
• Increased fuel consumption
• Check engine light illuminated
• Black smoke from exhaust pipe

Check for the plug wires to make sure they are not burnt or laying on the exhaust. With the valve disconnected, the red voltmeter lead has to be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. The connector cavity with dielectric silicone compound (same stuff they use for light bulb sockets and spark plug wires) needs to be packed and reassembled.

• Clean the MAF (Mass Airflow Sensor) with a safe electronic cleaner, if dirty.
• Replace MAF (Mass Airflow Sensor), if found faulty.
• Replacement of damaged MAP (Manifold Absolute Pressure Sensor).
• Check for any vacuum pump and air intake pipe leakages/damages.
• Replace faulty/broken/open/short wiring and connectors to the sensors and circuits.

However, if you face any of these issues then visit us at PARTSAVATAR CAR PARTS, CANADA. We have stocked a wide range of best priced ECM/PCM parts, transmission control systems, Car harness/wiring, solenoids, fuel pressure regulators and a lot more to help you out in fixing your car.

P0108 is properly diagnosed with an advanced scan tool capable of factory sensor readings (not just one from an auto parts store). A qualified technician can read the data from the advanced scan tool to determine when the problem occurred, or if it is still occurring. They may clear the code/light and test drive the vehicle while monitoring the scan tool data to see if the fault returns or is present.

Based upon the conditions of the test, possibly clearing the code, and road testing the car while monitoring the data, further diagnosis may be required. Diagnosis may require multiple tools such as:

• A technician typically begins by hooking the vehicle up to an OBD-II scanner in order to verify that the code is present, and check for other codes.
• This data along with freeze frame data is recorded, and the codes are then cleared to see if they reoccur.
• Next, there should be a visual inspection of the wiring and connectors to check for loose connections, corrosion, or shorts.
• Replacement of Damaged wiring/connections to the MAF (Mass Air Flow) Sensor and circuits.
• Repair faulty PCM sensor that may require reprogramming.
• Replace Leaky and damaged intake/inlet pipe immediately
• Faulty MAF (Mass Airflow Sensor) needs replacement as it directly hampers the engine performance.

Common mistakes when diagnosing the P0108 code

Diagnostic errors are largely due to not following the test procedure. The technician must verify that the voltage output of the MAP Sensor is in the correct range, fluctuates with the engine speed, and has proper voltage. Idle voltage is normally 1 to 1.5 volts and full throttle is usually around 4.5 volts.

Do not buy a new MAP Sensor or ECU unless it is clearly at fault.