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.
Code 68, Cruise System Problem Using Tech 1 (3.8L): Notes
PCM-integrated cruise control system is designed to monitor itself to ensure desired cruise position and actual cruise position are equal to each other. Code 68 sets when actual servo position sensor signal is 15 percent greater than desired servo position sensor signal for .6 second. Code 68 does not illuminate SERVICE ENGINE SOON light. If Code 68 is current, vehicle will operate in "power management" mode. During this mode, PCM will shut of fuel to 3 cylinders to avoid overrevving engine in case of throttle being held open by cruise system malfunction. Power management mode may be perceived as a severe engine miss of lack of power.
- Most VAC solenoids leak a small amount of vacuum when closed. However, they should not leak enough to allow WOT in 15 seconds with vent closed.
- When VAC solenoid is forced on, vacuum will be vented to atmosphere unless vent valve is stuck closed.
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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.
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