Question about 1999 Jeep Grand Cherokee

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What does the code 1686 mean for a jeep grand cherokee

My jeep starts up runs for a few seconds and shuts off. I am able to by pass the anti theft device? or how can I sync them together so it stay running?

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  • Jeep Master
  • 20,706 Answers

You have dash lamps acting funny?
diesel engine? or gas, and what displacement? 4.0 , 4.7
P1686


did the immo lamp glow.
did you scan the PCM and see if 1685 (wrong key code)
1686, rigth out of fsm

Trouble Code: P1686 4.7L
No SKIM Bus Messages Received
Number of Trips to Set Code: 1
PCM details.
Trouble Code Conditions:
Engine started; and the PCM did not detect any MIC (I/P Cluster) messages over the Data Bus circuit for 20 seconds.
Possible Causes:

  • Data Bus circuit from MIC to the PCM is damaged or it is open
  • Instrument Cluster is damaged or has failed
  • PCM unable to communicate with the Instrument Cluster
  • PCM has failed
this means, the PCM can not talk to the I/P cluster puter.
comm fail.
even wilder guess is PCM talks to KEY via cluster so if cluster dead
so be key.
bad fuses ?

the FSm dont cover defeating any alrarms or IMMO less crooks read it. so...... google it.

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

  • 118 Answers

SOURCE: How can I reset my Factory Alarm on my Jeep it wont run

Alarm Module Reset Procedure
NOTE: This information applies to a Vehicle Theft Security System (VTSS) that was armed when the battery was disconnected and reconnected.
When the armed VTSS senses that the battery has been disconnected and reconnected, it enters its power-up mode. In the power-up mode the alarm system remains armed following a battery failure or disconnect. If the VTSS was armed prior to a battery disconnect or failure, the system will have to be actively or passively disarmed following a battery reconnection.
The power-up mode will also apply if the battery goes dead while the system is armed and battery jump-starting is attempted. The engine no-run feature will prevent the engine from starting until the alarm system has been actively or passively disarmed.
Passive disarming of the Vehicle Theft Security System (VTSS) occurs when the vehicle is unlocked using the key to unlock either front door or the lift gate. Active disarming of the VTSS occurs when the vehicle is unlocked by depressing the Unlock button of the Remote Keyless Entry (RKE) transmitter.
Once the alarm has been activated (horn sounding, lights flashing, and the engine no-run feature), either disarming method will deactivate the alarm.
Depressing the Panic button (if equipped) on the RKE transmitter will also disarm the VTSS, but the horn will sound and the lights will flash for about three minutes as part of the Panic feature. The horn and lights can be stopped by pressing any of the RKE transmitter's buttons or driving the vehicle above 15 mph.

Posted on Jan 28, 2009

  • 819 Answers

SOURCE: how do i override/reset anti theft system?

this does not sound like an antitheft problem. the SKIS systems in the jeeps will allow the truck to start, but it will turn off again after 5 seconds.

FYI if your jeep key is gray, it has the SKIS system. if it is a black key, it does not.

have you already done diagnostics for a no start? if you are lacking fuel or spark, you need to look elsewhere for the problem if it does not start at all. good luck!

Posted on Jul 07, 2010

davidfink327
  • 140 Answers

SOURCE: 1996 Jeep Grand Cherokee - Will Not Start or Run

they have crankshaft sencers on the transmission on jeeps. it would be up high on the drivers side on front of transmission. they will cause it to not get fuel or fire and can run then quit.

Posted on Sep 21, 2012

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1 Answer

Losses key to 1999 jeep grand Cherokee. So I replaced entire steering column but jeep still shuts off in 3 seconds. Any suggestions?


Jeep has a chip in the key sounds like your anti theft is kicking in. The car will only run for a few seconds then shut off. I think it would require reprogramming of your computer. Some times company's on eBay can do the programming for a fraction of the cost

Feb 04, 2015 | 1999 Jeep Grand Cherokee

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Why do my my 04 jeep cherokee runs for 3 seconds then shuts off?


sounds like the anti theft system is activated , proberly cuts the power to the fuel or ignition follow this link for reset procedure
How to Reset the Anti Theft on Jeep Cherokee eHow

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How to update anti theft on 94 jeep?


skim error on dash, immoblizer>
if yes, then that needs checking,
the immo sure can drop the ASD relay on all jeeps.
and there is a scan code stored in memory DTC,

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1999 Jeep Cherokee grand..starts for a few seconds and shuts off


dies it have IMMO???? the IMMOBILZER?
id the light glowing, saying IM UNHAPPY?
1st google hit, of 6000 says SKIM failure.
been swapping major electronics ?
i see you left out the full story.
i did X and not SKIM is unhappy// what is X?

the FSM covers this, read the FSM>
or goggle Jeep SKIM

Smart Key Immobilizer Module = SKIM

Dec 29, 2013 | 1999 Jeep Grand Cherokee

2 Answers

1686 code came up on 99 jeep cherokee grand...what does this mean?


The p1686 code means :
No SKIM BUS Message received.
possible causes:
1. Invalid SKIM key.
2.wiring harness intermittent defect.
3.PCM DEF INTERNAL PCI BUS OPEN.
4.PCM PCI BUS CIRCUIT OPEN.
The first thing I would do is check the wiring harness unplug and check for loose pins then reconnect. Hope this helps.

Dec 29, 2013 | 1999 Jeep Grand Cherokee

1 Answer

DTC's P1686 P1687


Code 1687 means the computer lost power, probably when you disconnected the battery. Code 1686 means the computer is not talking to the instrument panel.
It could be the cluster or a wiring problem. Since you disconnected the battery, the computer may have to re-learn its parameters to know what the base idle should be. You may have to try to drive it a few miles.

Jul 03, 2013 | 2004 Jeep Wrangler

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2000 jeep grand cherokee by pass anti theft chip


Your keyboard broke before you could type the question.

May 06, 2012 | 2004 Jeep Grand Cherokee

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1999 Grand Cherokee Limited Jeep anti-theft system had shut all electronics down and engine will not start. what can I do to reset the system....


The 1996 Jeep Grand Cherokee Laredo Anti-Theft System is equipped with Vehicle Theft Security System (VTSS). VTSS system monitors vehicle doors, hood, liftgate and ignition. If an attempt is made to enter or operate vehicle without proper disarming of system, vehicle horn will sound, headlights, taillights and parking lights will flash, and engine will be prevented from running.

The following wiring diagram and electronics circuit contains detail schematics of The 1996 Jeep Grand Cherokee Laredo Anti-Theft System. Herein you will find interconnection between electronics parts of the system such as body control module, auto headlamp light sensor. VTSS led, driver door module, passenger door module, cylinder lock switch, junction block, power distribution center, and grounding. Herein you will learn also how the Vehicle Theft Security System works, removal, installation, testing and troubleshooting procedures.

Try HERE.

Also, remember that here can find the Jeep Grand Cherokee Service & Repair Manual.
Hope help with this.

May 03, 2010 | 1999 Jeep Grand Cherokee

1 Answer

Jeep starts and runs for about five seconds then cuts off


obviously the dealer did not correctly complete the repair, therefore should be more involved in current problem. If your vehicle had any anti-theft device installed, be aware that many have delayed shut down features built in. I'd look there first, providing yo did not have any similar problem pryor to the theft.
Good luck!!

Dec 12, 2008 | 2004 Jeep Grand Cherokee

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