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.
2006 Hummer H3 StandardFACTORY OEM SERVICE PROCEDURE
Powertrain Control Module (PCM) Replacement
WARNING: This page is about a different car, the 2005 GMC Canyon and 2005 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
If the powertrain control module (PCM) is replaced, the following procedures must be performed:
- The PCM reprogramming - Refer to Service Programming System (SPS) .
- The Crankshaft Position (CKP) Variation Learn - Refer to one of the following procedures:
- CKP System Variation Learn Procedure in Engine Controls - 2.8L (LK5)
- CKP System Variation Learn Procedure in Engine Controls - 3.5L (L52)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.