Ticking Noise in Reverse

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Ratcheting Noise

Checks	Causes
Parking Brake Pawl (50-81)	This noise may be caused by a bent parking lock actuator assembly (85). A bent actuator may not fully move the pawl (81) away from the internal reaction gear (684) when in reverse allowing the pawl to lightly contact the teeth of the internal reaction gear. The condition my not occur in forward gears as the additional actuator travel moves the pawl further from the gear teeth. To correct this condition, replace the parking lock actuator assembly (85).

Checks

Causes

Parking Brake Pawl (50-81)

This noise may be caused by a bent parking lock actuator assembly (85). A bent actuator may not fully move the pawl (81) away from the internal reaction gear (684) when in reverse allowing the pawl to lightly contact the teeth of the internal reaction gear. The condition my not occur in forward gears as the additional actuator travel moves the pawl further from the gear teeth.
To correct this condition, replace the parking lock actuator assembly (85).