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Home >> Chevrolet >> 2004 >> Avalanche 2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Automatic Transmission - 4L60-E/4L65-E (Introduction, Service & Replacement)) >> Description and Operation >> Electronic Component Description >> Tow/Haul Mode Switch

Tow/Haul Mode Switch

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Fig 1: Tow/Haul Mode Switch
GM1316269Courtesy of GENERAL MOTORS CORP.

Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul mode is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. This signals the powertrain control module (PCM) to extend the length of time between upshifts and increase transmission line pressure. Cycling the tow/haul switch again, or cycling the ignition switch disables tow/haul mode and returns the transmission to a normal shift pattern.