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GMC Jimmy Warning Lights and Gauges

17 messages,  Last post on Jul 14, 2008 at 10:15 AM

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#1 of 17 2000 GMC Jimmy Service 4WD Light... by cudakid67 Oct 30, 2007 (6:16 pm)
After my vehicle has run for a few minutes the Service 4WD light comes on, this happens every time I drive the vehicle.   I can shift it out of 2HI into Auto4WD, 4HI and 4LO...however, it will not go back into 2HI at all. If I unhook the battery for about 5 minutes and restart the vehicle it is back in 2HI.   I been told it could be a number of things, from the Transfer Case Control module, a vacuum leak, an actuator, shift module, etc.   I have a Chilton manual that gives details on how to replace parts, but doesn't really give any details as what needs replaced.   A couple of questions I have:   I've read about a number of different problems with 4wd, but I am wondering if anyone has experienced this particular problem and how was it fixed?   If I take it to a dealer and have them run the codes, does this tell them specifically what is wrong with it, or is it still a guessing game?   Does this light come on if the vehicle actually needs to have the transfer case serviced?
#3 of 17 ABS & Parking brake light by deevo123 Nov 09, 2007 (9:00 am)
Both of these warning lights come on after start up. They do not come on every time, but has become more regular lately. Replaced the front hub assemblies earlier this year, but would that warrant the parking brake light too? Thanks in advance.
#5 of 17 89 JIMMY OIL PRESSURE PROBLEM by dawgmom Nov 20, 2007 (9:58 pm)
The oil pressure gauge on my '89 S-15 JIMMY, 4WD, 2.8 with 111200 miles has been 'twitching' for several months. I replaced the sending unit last year. Now, the gauge just sort of has been moving up and down just a tiny bit - like a little twitch. Today, I traveled about 400 miles and by the end of my trip the oil pressure gauge was dropping to 25 PSI at idle and 40 - 45 at 65 MPH. It doesn't burn or leak oil, but I am running 10W-30. My guess is the pressure will go up tomorrow, after it's cool, but the 'twitching' will still be there. I can let you know, but any suggestions? Thanks. Replies to this message: dawgmom (Nov 21, 2007 3:28 pm)
#6 of 17 Re: 89 JIMMY OIL PRESSURE PROBLEM [dawgmom] by dawgmom Nov 21, 2007 (3:28 pm)
Replying to: dawgmom (Nov 20, 2007 9:58 pm) Okay. Today the gauge is still 'twitching' but not dipping as low. It's high [60 PSI] when it's cold, then 45 otherwise. It dips to about 35-40 at idle. Oil reads full on the stick. Sending unit isn't leaking. Took it to a shop, but the only thing they did was eyeball it - never took the unit off - just said no leaks.
#9 of 17 abs & brake light by unicorn747 Nov 28, 2007 (10:31 am)
I HAVE A 2001 GMC JIMMY & MY ABS & BRAKE LIGHT KEEPS COMING & STAYING ON , BUT IT USUALLY ONLY HAPPENS AFTER IT WARMS UP. I'VE TRIED TURNING IT OFF & STEPPING ON THE BRAKE PEDAL THEN RESTARTING IT TO GET THEM TO GO OFF -WHICH WORKS SOMETIMES AFTER THE 3RD TRY. I'M NOT HAVING ANY PROBLEMS WITH MY BRAKES NOT STOPPING OR ANYTHING THOUGH.

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