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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 813 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> DTC B2722: Tow/Haul Switch Signal Shorted To Ground >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Yukon XL, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Tow/Haul mode enables the operator to achieve enhanced shift performance when towing or hauling a load. When tow/haul is selected, the tow/haul switch input signal to the body control module (BCM) is momentarily toggled to zero volts. The BCM sends a serial data message to the powertrain control module (PCM) and instrument panel controller (IPC). The PCM extends the length of time between upshifts, increases transmission line pressure and the IPC illuminates the tow/haul indicator lamp. Cycling the tow/haul switch again disables the tow/haul mode and returns the transmission to a normal shift pattern.

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