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eauto
eauto, The Car Guy
Category: Jeep
Satisfied Customers: 15074
Experience:  ase mechanic 16 Plus years in the field
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My Jeep Commander is displaying DTC code P0688. What is

Customer Question

My Jeep Commander is displaying DTC code P0688. What is that? The engine will all of a sudden shut down while idling but it will re-start with no problems so far.
Submitted: 12 months ago.
Category: Jeep
Customer: replied 12 months ago.
2007 Overland 5.7 Liter Hemi........never had shut down problem before. This just started happening. Happens when in idle only so far after being driven a while. Will re-start so far without a problem. Happens out of the blue or intermittently. Has happened about four times lately.
Expert:  eauto replied 12 months ago.

P0688-AUTO SHUTDOWN RELAY SENSE CIRCUIT LOW

  • When Monitored:

With ignition key on. Battery voltage greater than 10 volts .

  • Set Condition:

No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault. Three good trips to turn off the MIL.

  • When Monitored:

With ignition key on. Battery voltage greater than 10 volts .

  • Set Condition:

No voltage sensed at the PCM when the ASD relay is energized. One Trip Fault. Three good trips to turn off the MIL.