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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Automatic Transmission - ALLISON - Introduction (2 Of 2)) >> Specifications >> Transmission Internal Mode Switch Logic

Transmission Internal Mode Switch Logic

WARNING: This page is about a different variant/trim than selected.
Transmission Internal Mode Switch Logic

Range A B C P
P OFF ON ON OFF
R OFF OFF ON ON
N ON OFF ON OFF
D ON OFF OFF ON
*M OFF OFF OFF OFF
1 OFF ON OFF ON
*L1 OFF OFF OFF OFF
*L2 OFF OFF OFF OFF
*L3 OFF OFF OFF OFF
*L4 OFF OFF OFF OFF
*L5 OFF OFF OFF OFF
*L6 OFF OFF OFF OFF
ON = Open Circuit
OFF = Grounded Circuit
*M mode allows TAP Up/TAP Down feature functionally between 1st through 6th ranges.