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.
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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1847 (AUTOMATIC TRANSMISSION - ALLISON - SPECIFICATIONS)SPECIFICATIONSTRANSMISSION INTERNAL MODE SWITCH LOGIC
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2
Transmission Internal Mode Switch Logic
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Transmission Internal Mode Switch Logic
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
| Range | A | B | C | P |
|---|---|---|---|---|
| P | OFF | ON | ON | OFF |
| R Transitional | OFF | OFF | ON | OFF |
| R | OFF | OFF | ON | ON |
| N | ON | OFF | ON | OFF |
| D Transitional | ON | OFF | OFF | OFF |
| D | ON | OFF | OFF | ON |
| *M | OFF | OFF | OFF | OFF |
| D1 Transitional | OFF | ON | OFF | OFF |
| 1 | OFF | ON | OFF | ON |
| Invalid | ON | ON | ON | ON |
| Invalid | ON | ON | ON | OFF |
| Invalid | OFF | ON | ON | ON |
| Invalid | ON | OFF | ON | ON |
| Invalid | OFF | OFF | OFF | ON |
| Invalid | ON | ON | OFF | ON |
| ON = Open Circuit OFF = Grounded Circuit *M mode allows TAP Up/TAP Down feature functionally between 1st through 6th ranges. In this range, logic states do not change. |
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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.