DTC 71, Set/Coast Switch Fault (Models With Pcm): Notes

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1995 GMC Yukon, 1995 GMC Suburban, 1995 GMC Pickup, 1995 GMC Cab & Chassis, and 1995 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Cruise ON/OFF, SET/COAST and RESUME/ACCEL switches are inputs to fuel control portion of PCM. These inputs allow PCM to control and hold a requested speed. Set/coast request signal circuit supplies ignition voltage to PCM when set/coast is depressed. DTC 71 will set when:

Cruise control is on.
Ignition voltage on set/coast request signal circuit is present for more than 25.5 seconds.

PCM will default to disallowing all cruise inputs. TCC shift schedules may be affected.

NOTE: Test numbers refer to numbers on diagnostic chart.

This step determines if cruise control switch is okay.
This step determines if PCM or switch is at fault.