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Jeep Grand Cherokee, Electrical, SUV
#410 of 735 2001 G Cherokee P1686 codes & gauges not working
Oct 06, 2010 (12:46 pm)
Out of the blue, my 2001 Grand Cherokee 4.0L will start then shut-off: It's accompanied by code P1686 No SKIM bus. This explains the shut-off part but none of the gauges work either. I've seen this same problem posted in other forums with many suggestions but no one with the exact symptoms as mine posted what finally fixed their problem. Battery & connections look OK. Any suggestions?
#411 of 735 Re: 2001 G Cherokee P1686 codes & gauges not working [erkan]
Oct 06, 2010 (2:17 pm)
I have a 2000 grand cherokee limited that is doing the exact same things, the gauges dont work , it starts and runs 2 to 4 seconds and shuts off, also all the
warning lights are lit up. Were you able to find out what it is and did you haveit fixed
#412 of 735 Re: 2001 G Cherokee P1686 codes & gauges not working [erkan]
Oct 07, 2010 (6:04 am)
Bad wording in original post. I didn't mean that the Jeep starts by itself & then shuts-off. I meant that the problem started all of a sudden last week. When I turn the key, the engine cranks & starts fine but the SKIM (Sentry Key Immobilizer Module)--the anti-theft feature built into the iginition key system--kicks in & shuts off the engine. Check Engine Light comes on & throws a P1868 (No SKIM bus) code. If it was the key or the SKIM itself, why would the gauges go out also? In other posts people have reported replacing the PCM &/or BCM without luck, which I'm afraid my local dealer might try to do.
#413 of 735 Re: 2001 G Cherokee P1686 codes & gauges not working [erkan]
Oct 07, 2010 (11:07 am)
When i had a starting problen a year ago, i researched the sentry key system, because i thought maybe it was my problem. It was not, but i learned a lot about it. First of all, do you have 2 keys? If so try the other one, if it works, then the other sentry key has bit the dust. If both do not work and both seem to have same symptoms, then it is quite possibly the module under the sterering wheel cover attached to back of ignition switch which reads the sentry key and if it gets signal from sentry key, then sends a signal to pcm allowing start up to complete with no shutdown. If it is this unit bad, unfortunuately just replacing it is no help, for after replacement a DEALER (I HATE THAT) must then program both the unit and you keys.Make sure you give dealer both keys, as both have to be reprogrammed to the unit, if only one is done, the other will not work. So you will be paying for the part, diagnosis, labor and reprogramming keys. If one of your keys still works and you don't care about replacing other, fine, but if its a bad sentry key you want replaced, you must still take to dealer, and dealer must then program the new key AND the old key so they match. If he does not program both, again only the newly programmed one will work. I have a 99 JGC with 165,000 miles, keys have not failed, but if one of my keys failed, when i replaced it, i would not buy one, i would buy 2, and let dealer program the 2 new ones and the still working old one, so if at some point old age kills the still working old one i will be good to go. Bypassing the module will not work, computer needs a valid signal from it to allow starting. But before you go to dealer if both keys do not work, loosen the covers on ignition asnd steering wheel, make sure wires coming in module and leaving module are not broken or pinched, but that is not likely the problem unless a short time before fail you had been working under there and pulled a wire out yourself or caused a problem in closing it up and pinching wires, not a likely fail. Dealer must have vehicle and all keys when programming is done. From what i have read it is more likely module has failed than a key, but if one key works its the module. If you only have one key, then you will not know if its bad key or bad module until dealer tells you.Try disconnecting battery for 10 minutes, reconnecting. If that clears the problem, then its not key or module, but some other sensor or wire, and problem will come back. If that clears problem, though, it will tell you to perhaps save the expense of replacing module and/or keys. Call local dealers, maybe one offers to send a mechanic out to replace module and reprogram keys without towing in to dealer, he can bring the handheld rteprogrammer with him. if you are in Autu club, decision is easy, get a free tow. I tried to join AAA when i had a fail, but they make you wait a week after you join to get a tow, to avoid freeloaders, but if you can put vehicle aside for a week, its a good deal, tow will cost the same or more, and you will be eligable for future tows free.
#414 of 735 Re: 2001 G Cherokee P1686 codes & gauges not working [barryz]
Oct 08, 2010 (11:26 am)
THanks for the info but if it's the key or SKIM module, why would the gauges also not work?
#415 of 735 Re: 2001 G Cherokee P1686 codes & gauges not working [erkan]
Oct 08, 2010 (1:33 pm)
Since the computer is being told that there is not a valid smart key module signal, it is trying to protect your vehicle from theft, and everything is shutting down. Gauge readings depend on computer signals which they will not get valid signals if computer thinks car is being stolen. A weak battery that needs replacement can cause gauges to go hawywire as computer will not function properly at low voltage. If battery is less than slightly over 13vdc under load of starting it is weak. good batteries are around 13.5 - 14 vdc. I had gauges go crazy whwn my battery was old for the month before it finally died, but there was no skim code, you probably have a problem in that system, logically. You did not mention trying your other key or if you have one. My knowledge of this system is just through online research when i was troubleshooting me bad crank position sensor, which lit up my smart key light but all the other symptoms are different. If your car starts for a few seconds, its a classic sentry key or module sympton, especially with that code.
#416 of 735 Grand Cherokee 4.0 petrol automatic - radio immobiliser
Oct 10, 2010 (4:59 am)
I accidently activated the immobilser within the Stereo of my 1996 Grand Cherokee 4.0 petrol automatic - and now dont know of how to start car, as the immobiliser has kicked in and accidently activated it through the radio/stereo, when I was pressing various buttons, please can you help me.
#417 of 735 rear fog lights not working.
Oct 12, 2010 (8:08 am)
Hi folks, new on here. I have a 2007 grand cherokee crd owned since new, failed its first mot due to the rear fog lights not working. The log books vague, doesn't even tell you which fuse is for the rear fog lights. Have had an auto electrician on it but can't find the problem. The only other info is I have had a tow bar fitted a couple of years ago and last year noticed the fog lights on caravan not working, but silly me never checked since last year and have not used the caravan since. Any help would be appreciated as I have only a couple of days left on the free retest.
#418 of 735 Update 2000 Jeep GC Limited
Oct 16, 2010 (4:04 am)
Just replaced the battery (only three years old) and now the Jeep will stay running after starting but still having dash problems. The gauges only work maybe 10% of the time and the dash warning lights are lit. One time all lights went out except for the light that looks like a small key ( security ?) . Any idea's.
#419 of 735 Re: Update 2000 Jeep GC Limited [bee007]
Oct 16, 2010 (10:35 am)
next change ignition switch easy and not to costly could have bad contacts