Check engine light


GKW05GT

GT Owner
Mark II Lifetime
May 28, 2011
2,695
Fayetteville, Ga.
Took 05 out yesterday and check engine light was on but went out after a couple minutes. After driving it came on again so took it to the shop and checked the codes. Should no faults and no old faults. Once unplugged light was off again. Seems to be intermittent and no issues with way car runs. Can the light be bad or any other ideas?
 

DakotaGT

GT Owner
Mark II Lifetime
Dec 9, 2012
1,578
Sioux Falls, South Dakota
Are you certain it is the “check engine” light, and not the “check gauges” light? When this light comes on, are all of the gauges operating correctly? Is your battery starting to get old or rundown? Fuel level very low? Ground strap good and tight? Just a few thoughts...
 

nota4re

GT Owner
Mark IV Lifetime
Le Mans 2010 Supporter
Feb 15, 2006
4,023
If indeed a YELLOW Check engine light, the ONLY scenario where we have seen the light self-clear is when it is due to a very low battery condition. Battery tenders are absolutely great but one downside is that they really help to mask a failing battery - especially if you have one or two cells going out. Let the car sit for a few hours after driving and disconnected from the tender. Battery voltage should be 12.4-12.6v. If your battery voltage is 12.0 or less, it's time for a new battery.
 

GKW05GT

GT Owner
Mark II Lifetime
May 28, 2011
2,695
Fayetteville, Ga.
If indeed a YELLOW Check engine light, the ONLY scenario where we have seen the light self-clear is when it is due to a very low battery condition. Battery tenders are absolutely great but one downside is that they really help to mask a failing battery - especially if you have one or two cells going out. Let the car sit for a few hours after driving and disconnected from the tender. Battery voltage should be 12.4-12.6v. If your battery voltage is 12.0 or less, it's time for a new battery.
Indeed was check engine light check as directed
thanks
 

GKW05GT

GT Owner
Mark II Lifetime
May 28, 2011
2,695
Fayetteville, Ga.
Battery showed 12.8V turned off 12.28 switch on. check engine light on after starting. Will check the ground
 

GKW05GT

GT Owner
Mark II Lifetime
May 28, 2011
2,695
Fayetteville, Ga.
Had another guy pull code shoes high oil pressure gauge. Gauge is showing between 30 and 75 psi.
 

68Rcodeman

GT Owner
Mark II Lifetime
Apr 5, 2008
779
Spring Hill, FL.
Gary, Usually that type of code would say High circuit. Meaning high resistance. What was the five digit code? P????.. The P stands for powertrain fault.