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2001 Jeep Cherokee 4.7L P0108 Code: Intermittent Check Engine Light and Acceleration Hesitation Explained

Model: 2001 Jeep Cherokee Fault Code: P0108 Posted: 2019-08-14 15:50

I've been experiencing a check engine light code P0108 on my 2001 Jeep Cherokee with the 4.7L engine. When I use the ignition cycle method (on-off-on-off-on-off), the code appears consistently, but the Malfunction Indicator Lamp (MIL) only comes on occasionally—typically when the engine is hot and rarely or not at all when cold. Additionally, I've noticed a rare hesitation during highway driving, especially under light acceleration. A local repair shop suggested it might be related to the fuel pump or fuel filter, though the issue has remained stable for over a year and hasn't worsened. I have three questions: 1) Could the intermittent P0108 code and the hesitation during driving be related? 2) Is it necessary for the MIL to illuminate when diagnosing the root cause of this problem? 3) What are the most likely causes, especially given that the MIL only activates intermittently? Any insights or troubleshooting steps would be greatly appreciated.

Related fault codes
P0108
Comments (5)
Anonymous 2019-08-14 18:02

Recommended diagnostic steps: - Check for vacuum leaks near the Mass Airflow (MAP) sensor. - Inspect the MAP sensor itself for signs of damage or contamination. - Test wiring and connections for shorts or open circuits, including signal and reference voltage wires. - Verify ground connection to the MAP sensor. - Evaluate engine wear as a potential cause of reduced vacuum levels. Potential causes of P0108: - Faulty MAP sensor - Vacuum leak in the intake system - Shorted or damaged wiring harness - Open circuit in ground path to MAP sensor - Engine internal wear leading to low vacuum For more details, refer to official P0108 code explanations.

Anonymous 2019-08-15 09:37

Please respond with your answers to the three questions above. This will help clarify whether the symptoms are interconnected and how best to proceed with diagnosis.

Anonymous 2019-08-15 11:23

Intermittent P0108 codes can contribute to drivability issues such as hesitation, especially under load. Fuel delivery problems may also manifest similarly. It's possible to diagnose the root cause of intermittent P0108 without the MIL being active—since the code is stored in memory and triggered by specific conditions. The listed potential causes should be evaluated systematically. Without testing actual sensor readings or system performance, it’s difficult to confirm which component is failing. Are you performing this diagnosis yourself (DIY) or working with a professional shop?

Anonymous 2019-08-15 11:33

I'm doing the troubleshooting myself (DIY). Any advice on how to proceed would be helpful.

Anonymous 2019-08-15 12:34

As a DIYer, using a scan tool to monitor live engine parameters like MAP sensor readings and intake manifold pressure is highly recommended—it provides real-time data that helps pinpoint issues. Begin by visually inspecting the MAP sensor for vacuum leaks or contamination. Then test the sensor's voltage and resistance outputs against manufacturer specifications. Also consider engine wear as a contributing factor, especially if vacuum levels are inconsistent. Once you've tested these components, share your findings—we’d love to see what you discover.