P0108 on a Chevy: 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 Chevy

On a Chevy, P0108 means the manifold absolute pressure (MAP) sensor voltage is too high. GM puts MAP sensors on most engines, from trucks to cars, and the signal tells the computer how much load the engine is under. A failed sensor or a short in the wiring usually triggers this code.

Is P0108 common on Chevys?

Chevy trucks and SUVs like the Silverado, Tahoe, and Equinox commonly see P0108 as they age, most often from a failing MAP sensor or a chafed harness. GM MAP sensors are inexpensive and easy to replace, so this is usually a low-cost fix.

Commonly reported on: Silverado, Tahoe, Equinox, Malibu.

Symptoms

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

Common causes

most common: Faulty MAP sensor
common: Signal wire shorted toward 5 volts
common: Chafed wiring harness near the sensor
less common: Corroded or loose 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	$100–200