Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
DTC 71 - Set/Coast Switch Fault: Notes
The cruise ON/OFF, SET/COAST and RESUME/ACCEL switches are inputs to the fuel control portion of the PCM. These inputs allow the PCM to control and hold a requested speed. The set/coast request signal circuit supplies ignition voltage to the PCM when set/coast is depressed. DTC 71 will set when:
- Cruise control is on.
- Ignition voltage on the set/coast request signal circuit is present for more than 20 seconds.
PCM will default to the PCM disallowing all cruise inputs. TCC shift schedules may be affected.
- This step determines if the cruise control switch is okay.
- This step determines if the PCM or switch is at fault.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.