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 2111 (AUTOMATIC TRANSMISSION - 2ML70 - 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 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
Internal Mode Switch (IMS)
| IMS Circuits/Parameter | Selector Position | ||||
|---|---|---|---|---|---|
| Park | Reverse | Neutral | Drive | Manual | |
| Direction Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| Direction IMS D1 | HIGH | HIGH | LOW | LOW | LOW |
| Direction IMS D2 | LOW | LOW | HIGH | HIGH | HIGH |
| Direction IMS R1 | HIGH | LOW | LOW | HIGH | HIGH |
| Direction IMS R2 | LOW | HIGH | HIGH | LOW | LOW |
| Direction IMS Start | LOW | HIGH | LOW | HIGH | HIGH |
| Range Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
| IMS A | LOW | LOW | HI | HI | HI |
| IMS B | HI | LOW | LOW | LOW | HI |
| IMS C | HI | HI | HI | LOW | LOW |
| IMS P | LOW | HI | LOW | HI | LOW |
| Always HIGH status: Open/short to voltage condition Always LOW status: Short to ground condition Every status HIGH for either switch indicates an open ground circuit or connector for that portion of the IMS. |
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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.