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02-14-2006, 09:10 AM
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#1 |
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Registered User
Join Date: Dec 2004
Location: Readsboro, VT
Posts: 502
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Code 51: PROM Failure
 Not what I expected when I came out to the truck this morning. I started the truck and went back inside, and when I came back, the SES light was flashing at a very quick rate, which is something I've never seen a GM light do before. Of course the batteries were dead in my scan tool, and my 2nd set of batteries weren't worth a damn either. I hopped in and tried to drive, and it drove fine. I headed to work, and after a few minutes the light went out. It flickered one more time very briefly about 20 minutes later, but otherwise seems fine. Is it possible that I've just got a poor connection where the MEMCAL plugs into the ECM, or is this likely to be bigger things? |
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02-14-2006, 01:01 PM
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#2 |
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www.73-87chevytrucks.com
 
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: Code 51: PROM Failure
I haven't had to fix one with that code before. That sucks. Have you removed the MEMCAL lately?
__________________
Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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02-14-2006, 02:09 PM
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#3 |
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Registered User
Join Date: Dec 2004
Location: Readsboro, VT
Posts: 502
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Re: Code 51: PROM Failure
nope. I haven't touched it since I owned the truck. Tonight I'll probably pull it out and reinstall it a couple times just to make sure the contacts are clean.
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02-14-2006, 04:28 PM
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#4 |
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www.73-87chevytrucks.com
Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: Code 51: PROM Failure
That is weird! Sounds like you have a plan. Let us know if it fixes it.
__________________
Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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02-14-2006, 07:56 PM
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#5 |
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Registered User
Join Date: Dec 2004
Location: New Lenox, IL
Posts: 442
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Re: Code 51: PROM Failure
I had the EXACT same deal with an 87 monte carlo i had. Came on occasionaly, then the light stayed on constantly
I was worikng at a parts store so I was able to swap computers and put my chip in the new one. The light stayed off so I knew my chip was good. I wouldn't have replaced it because it still ran perfecet and in closed loop, but they won't test the emissions with the light on. Long story short- got a boneyard computer. Fixed it Good Luck -Jeremy
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79 Jimmy slammed AKA James Down |
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02-15-2006, 09:25 AM
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#6 |
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Registered User
Join Date: Dec 2004
Location: Readsboro, VT
Posts: 502
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Re: Code 51: PROM Failure
no problems on the way home from work and no problems this morning. I didn't get a chance to screw with it last night, but hopefully this weekend I'll yank the MEMCAL while I do the oil change I've been meaning to get to.
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