Chrysler 300 Check Engine Light P0108 Fix - Manifold Absolute Pressure Sensor Circuit High

By Nick Marchenko, PhD

Have you been greeted by the ever-daunting check engine light on your Chrysler 300, specifically with a P0108 error code flashing in defiance? Fear not, for today, we embark on a journey through the maze of Manifold Absolute Pressure (MAP) Sensor Circuit High, unraveling the mystery of the P0108 trouble code and steering you towards a fix that could save your day—and your wallet.

Decoding the Trouble Code P0108

The P0108 code signals that the MAP sensor in your Chrysler 300 is sending a voltage reading to the engine control module (ECM) that is higher than expected. This sensor is crucial for your engine's computer to calculate the right amount of fuel injection, ensuring your car runs smoothly and efficiently.

Initial Diagnosis

Our adventure begins with a simple yet effective step: connecting an OBD2 scanner to your vehicle. Remember, to communicate with your car's ECM, your Chrysler 300 must be in the "Run" position, but the engine need not be running. A smart vehicle identification number (VIN) scan will swiftly bring up the necessary details about your vehicle, leading us to the heart of the issue.

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Finding the MAP Sensor

With the scanner pointing us to the P0108 code, our quest leads us to the MAP sensor, located cunningly on the side of the engine. A bit of exploratory surgery (removing the engine cover, that is) reveals our target. Here, it's essential to inspect not just the sensor but also its surrounding area for any signs of trouble like disconnected vacuum lines, which could be the culprits behind our errant code.

The Art of the Fix

Should your detective work uncover nothing visually amiss, you might consider employing a smoke machine to uncover any elusive leaks. If the sensor itself appears to have joined the choir invisible, fear not. Disconnecting and removing it is a straightforward affair, requiring a mere twist and a gentle pull. Installing the new sensor is just as simple, ensuring it's seated correctly before reattaching the connector and replacing the engine cover.

The Grand Finale: Clearing the Code

With the new MAP sensor in place, the final act involves clearing the code from the ECM's memory. This is easily done with our trusty OBD2 scanner, preparing your Chrysler 300 for a triumphant return to the roads, free of the P0108 code's shadow.

In Conclusion

If the check engine light remains off, congratulations are in order! You've successfully navigated the troubleshooting process. However, if the light reappears, it may be time to delve deeper, possibly indicating a more systemic issue within your vehicle's vacuum system or beyond.

For those thirsting for more knowledge or facing other vehicular challenges, feel free to explore our repository of wisdom:

• DIY Guide: How to Replace the MAP Light Bulb in a Chrysler 300
• How to Replace the Third Brake Light Bulb in a 2011-2023 Chrysler 300
• Replacing the Trunk Actuator and Button on a 2011-2023 Chrysler 300: A Step-by-Step Guide
• Replacing the Window Regulator Motor in a 2011-2023 Chrysler 300: A DIY Guide
• Replacing the Window Switch on Chrysler 300 Models From 2011 to 2023

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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