Jun 142015
 

Tow haul mode quit working

  One Response to “2006 jeep grand Cherokee 4.7l”

  1. The tow/haul overdrive OFF (control) switch is located in the lower portion of the center instrument panel switch cluster. The switch is a momentary contact device that signals the PCM to toggle current status of the overdrive function.

    The switch may have failed. The solenoid may have failed or wiring in between.

    At key-on, overdrive operation is allowed. Pressing the switch once causes the tow/haul overdrive OFF mode to be entered and the Tow/H aul lamp to be illuminated. Pressing the switch a second time causes normal overdrive operation to be restored and the tow/haul lamp to be turned off. The tow/haul overdrive OFF mode defaults to ON after the ignition switch is cycled OFF and ON. The normal position for the control switch is the ON position. The switch must be in this position to energize the solenoid and allow a 3-4 upshift. The control switch indicator light illuminates only when the tow/haul overdrive switch is turned to the OFF position, or when illuminated by the transmission control module.

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