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PCM relay ticking


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3 replies to this topic

#1 OFFLINE   Old Reb

Old Reb

    New Edge Member

  • Edge Member
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  • Region:U.S. Southern Plains
  • Location:Texas
  • Edge's Year:2007

Posted 11 August 2017 - 07:23 AM

I have a 2007 SEL and it has had this problem for the last few months.  The PCM power relay ticks after you turn the key off.  The TPS also ticks in time with the relay.  Unplug the relay and plug it back in and it stops.   I've researched this problem and have heard causes were anything from a weak ground to the high pressure switch on the A/C compressor to a bad PCM.  I just replaced the PCM and had it reflashed by the Dealer and this problem continues.   I've even ran a separate 4 gauge ground from the battery to the PCM grounding lug. The only codes it has ever thrown are P0442 or P0444.  I had a shop in Dallas diagnose it yesterday, and they had no idea what the problem could be.  Has anyone other than me had this problem?  If so, how did you fix it?  My wife loves the truck, but I'm getting tired of throwing money at it.

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#2 OFFLINE   enigma-2


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  • Edge Member
  • 2,971 posts
  • Region:U.S. Great Lakes
  • Location:Indiana
  • Edge's Year:2009

Posted 12 August 2017 - 02:38 AM

Just out of curiosity, what's the battery voltage? Someone else in the 150 forum reported the same problem went away after he put in a new battery.

Edited by enigma-2, 12 August 2017 - 02:38 AM.

  • WWWPerfA_ZN0W likes this

#3 OFFLINE   Old Reb

Old Reb

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  • Edge Member
  • 2 posts
  • Region:U.S. Southern Plains
  • Location:Texas
  • Edge's Year:2007

Posted 14 August 2017 - 07:07 AM

The battery voltage was 12.9 vdc and was less than a week old so I know it was good.  I watched a you tube video, wish I could remember the guys name, but he showed how to check for a short in the electrical system using a multi meter that can read amps. I had 3.6 amps showing between the negative post of the battery and the negative battery clamp with everything off.  Started pulling relays then fuses until I found the culprit.  I had a short in the cooling fan control module.  Replaced the module and everything is great.  My wife loves her Edge again. I would suggest to anyone that runs into this problem to check for short circuits first before going into the expense that I did.

  • WWWPerfA_ZN0W and macbwt like this



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  • Region:U.S. Northeast
  • Location:Maryland
  • Edge's Year:Decline

Posted 14 August 2017 - 07:31 AM

Eric the car guy?
  • macbwt likes this

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