P0108 on a Jeep: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Safe to drive, but the engine may idle rough, hesitate, and use more fuel until the sensor is fixed.

What P0108 means on a Jeep

On a Jeep, P0108 means the manifold absolute pressure (MAP) sensor circuit is reading a voltage higher than the computer expects. Jeeps have used MAP sensors for decades, including on the 4.0L inline-six, and the reading helps the computer set fuel and spark. A failed sensor or a wiring problem usually triggers this code.

Is P0108 common on Jeeps?

Wranglers, Cherokees, and Grand Cherokees see P0108 fairly often, especially with higher mileage or rough off-road use that damages connectors and wiring. It is a common, easy fix with inexpensive parts.

Commonly reported on: Wrangler, Cherokee, Grand Cherokee, Liberty.

Symptoms

Check engine light on
Rough idle
Hesitation or stumble under load
Reduced fuel economy

Common causes

most common: Faulty MAP sensor
common: Signal wire shorted toward 5 volts
common: Damaged connector or wiring from off-road use
less common: Corroded connector terminals

How to fix it

Fix	DIY?	Typical cost
Replace the MAP sensor	Yes	$25–70
Repair the wiring or connector	Mechanic	$50–150
Have a shop replace the sensor and verify the circuit	Mechanic	$100–210