Oct 26, 2019 · P0688 ECM/PCM Power Relay Sense Circuit Open How to easily diagnose, repair, and info on causes of a P0688 trouble code that indicates an open state of the ECM/PCM …

Oct 19, 2013 · Any help? Truck died in the middle of the road. Will not start. Fuel pump working. Getting this code. Clear it, comes back.

P0688 Code - Stranded! 1 reading Jump to Latest 24K views 7 replies 6 participants last post by cruzcode Jan 12, 2011

Aug 7, 2024 · P0688 code popping up car won’t start Jump to Latest 999 views 1 reply 2 participants last post by Stay Thirsty My Friends Aug 7, 2024 2

Aug 30, 2010 · Anyone have any problems with Auto Shutdown yet? My jeep died on me on the way home from work on Friday, would crank but not start. Tech at the dealer diagnosed a …

May 6, 2011 · P0688 ECM/PCM Power Relay Sense Jump to Latest 18K views 4 replies 3 participants last post by tc6080 Jul 2, 2016 Mad_Scientist Discussion starter

Oct 23, 2013 · B. Parts Covered for 8 years or 80,000 miles If your vehicle has one of the following parts, this Federal Emission Warranty covers that part for a period of 8 years or …

Dec 18, 2006 · The P0688 code is defined as ECM/PCM Power Relay Sense Circuit Open. Can anyone tell me what this means and how I can check it? The truck was hit pretty hard about …

Aug 16, 2025 · The P0688 code in a Jeep indicates a problem with the Auto Shutdown (ASD) relay control circuit being open. This code is logged when the powertrain control module …

Jul 31, 2013 · But the codes i dont understand are p0685 p0688 automatic shutdown ASD relay control circuit and ASD sense circuit low voltage ???? Also after trying to restart few times had …