Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Perform the following in order to avoid misdiagnosis.

Inspect for proper operation of brake lamps and clutch switch, if equipped.
Inspect for proper operation of the transmission range switch.
Inspect throttle linkage for mechanical binding which could cause the system to malfunction.
Inspect cruise control cable adjustment, should have minimum slack.
EMI on the speed sensor signal circuit may cause erratic cruise control operation.