Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Jeep Wrangler 4WD V6-3.8LFACTORY OEM SERVICE PROCEDURE
Transmission Control Module - Description
DESCRIPTION
The Transmission Control Module (TCM) is a sub-module within the Powertrain Control Module (PCM) (2).
The PCM (2) is located on the right side of the dash panel in the engine compartment on left hand drive vehicles. The PCM is referred to as the NGC.
The PCM (1) is located on the left side of the dash panel in the engine compartment on right hand drive vehicles.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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