![]() ![]() ![]() If it’s higher, you may need a new MAP sensor. The reading from the voltmeter should be around 1 to 1.5 volts at idle. You can get them pretty cheap from any hardware store or Amazon. A good voltmeter is necessary for this step. The first thing that you should do is test the MAP sensor itself. When diagnosing this code, if your Ram is running fine you should first reset the code and take the vehicle out and try to reproduce the problem. Here are the most common symptoms of P0108: If it’s gone bad, it’ll really affect drivability. The MAP sensor is vital to a well running vehicle. P0108 is always going to do more than just trigger the check engine light. A voltage meter is required to diagnose the MAP sensor.Usually results in a rough running vehicle.Vacuum or wiring issue are the next most common causes. Most commonly caused by a bad MAP sensor.P0108 is caused when there’s too much voltage coming from the MAP sensor to the ECM.P0108 can also trigger if the ECM thinks the voltage coming from the MAP sensor is higher than it should be at any given time. P0108 is triggered whenever the signal from this wire is MORE THAN 5 volts, which shouldn’t happen. The signal should be at 5 volts whenever the vehicle is at wide open throttle. It does this by sending a voltage ranging from 1 to 5 volts. The MAP sensor measures the air pressure coming into your Ram’s engine and sends that signal to the ECM. It’s most commonly caused by a bad MAP sensor, wiring issue, or vacuum leak. It indicates your Dodge Ram’s MAP (manifold absolute pressure) sensor’s voltage reading is outside of the normal operating range. ![]()
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