A P0108 fault code indicates an issue with the circuit for the Intake Manifold Air Pressure (MAP) sensor. P0108 code will trigger the check engine light if there is a problem with the intake manifold pressure sensor, faulty connector, or damaged wires.
The two most common problems that trigger the check engine light with code P0108 are a bad MAP sensor or wiring issue.
The intake manifold pressure sensor can trigger more than the fault code:
- P0108 – Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor – high input
- P007D – Charge error coolant temperature circuit high bank 1
Possible Causes
- Faulty manifold pressure sensor
- Damaged connector for manifold pressure sensor
- Damaged wires that connect to the manifold pressure sensor
- Faulty Engine Control Unit (ECU) – Rare
MAP sensor communicates with the ECU. It operates in a 5-volt range and not 12 volts.
Symptoms
A fault MAP sensor can cause several issues, including:
- Check engine light on
- Rough idle
- Acceleration problems
- Poor fuel economy
How to fix code P0108
The video above shows you how to diagnose fault code P0108. Even though we diagnosed the problem on a 2016 Volkswagen Jetta, the procedure is the same for all cars since P0108 is a generic code.
The YOUCANIC Full System Scanner can read and clear fault codes through every vehicle’s control module.
The location of the MAP sensor will vary, but the sensor is usually installed on the intake manifold.
First, start reading the fault codes using an OBD-II scanner. Connect the scanner to the diagnostic port under the dashboard and read codes from the Engine Control Module (ECM).
Next, locate the connector to the MAP sensor. Unplug it and check it for corrosion. If no corrosion is present, use a digital multimeter to check the voltage to the sensor. With the ignition on, you should read around 5 volts. If you get 0 volts at the connector end, there is a wire harness or ECU problem. If you are reading 5 volts, the problem is that the sensor itself needs to be replaced.
How to replace a MAP sensor
Replacing the MAP sensor is a very simple job that usually takes less than one hour.
- Park the vehicle on level ground.
- Allow the engine to cool down.
- Open the hood and secure it open.
- Locate the engine intake manifold.
- Remove air filter housing or other covers on the MAP sensor.
- Unplug the MAP sensor’s electrical connector by pressing on it and then pulling it away.
- Remove bolts that hold the MAP sensor in place. On a Volkswagen, you don’t need to remove any screws. Simply press on the locking tabs, then pull the sensor.
- Install the new MAP sensor in reverse order.
Can I drive with a bad MAP sensor?
While the car will still run with a bad MAP, we do not recommend driving. Fuel consumption will increase significantly; in some cases, the vehicle may get stuck in limp mode, meaning the transmission won’t shift gears.
Can a bad MAP sensor throw a code?
Yes, a bad MAP sensor can throw more than one code: Here are a couple of common fault codes triggered by a bad MAP sensor:
- P0108 – Manifold absolute pressure (MAP) sensor/barometric pressure (BARO) sensor – high input
- P007D – Charge error coolant temperature circuit high bank 1
Can you clean a MAP sensor?
You can clean a MAP sensor with electric parts cleaner. Cleaning the MAP sensor does not always work.
We hope you find the VW P0108 Code Manifold Air Pressure (MAP) Barometric Pressure Sensor guide helpful. Check these troubleshooting and repair guides for more help on your Volkswagen.