Question about 1999 Jeep Grand Cherokee

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

Jeep starts and runs for a few seconds then shuts off. ran test and code 1686 came up. is there a way I can bypass the anti theft relay to start it? Or how do I get them in sync again?

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  • Jeep Master
  • 20,706 Answers

Both keys fail, car came with 2,
never keep less than 2 or get stranded......
can be many things, cause but key tops list , and is the most easy to fix. get a reprogrammed key from dealer.
if you had 2, you can make a 3rd. DIY (rules are in operators guide, if you care to read them)

Posted on May 17, 2015

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  • Master
  • 468 Answers

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.

Posted on Dec 29, 2013

  • Michael Miller
    Michael Miller May 17, 2015

    Were is the plug for the PCM located on my jeep

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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

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

  • 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

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1 Answer

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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there is some issue with ur anti theft sy.

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How can I bypass the antitheft system? my jeep will run for 2 or 3 seconds then stop running


Have you tested the ASD relay ? Most anti-theft systems will not let you crank or start the engine at all. If it starts for a few seconds, you are loosing spark or fuel.

May 30, 2014 | Jeep Cars & Trucks

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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

1 Answer

What does the code 1686 mean for a jeep grand cherokee


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.

Dec 29, 2013 | 1999 Jeep Grand Cherokee

1 Answer

1995 jeep gc limited runs then shuts off


The Chrysler factory VTSS vehicle theft security system will do just that. Try unlocking the vehicle with the remote or one of the three VTSS switches, both front doors or the rear hatch. Sometimes the door switches get damaged front "Slim Jimming" the lock. The rear hatch switch is usually intact. The VTSS should "Arm" after a battery disconnect or dead battery. The VTSS cannot be bypassed once it is activated. If you put a previously installed ECM that was on a vehicle with VTSS, on a vehicle without VTSS the vehicle will not run.

Mar 27, 2009 | 1995 Jeep Grand Cherokee

1 Answer

Car won't start - anti-theft light flashing


it sounds like the immobilizer is faulty. this will shut off the electrical feed to the starter motor. you will need to take it to a garage to get this fixed.

hope this helps.

Mar 18, 2009 | 1997 Pontiac Sunfire

3 Answers

2000 jeep cherokee starts then stalls in approx 3 sec 4.0 has new crank sensor


I am going to assume that it will not run even if you push on the accelerator pedal?
Can you install or attach an old timing light to the spark plug wires, turn it one and try to start it. The light should flash with the engine running, but if it shuts off at time of engine die, and the engine is still spinning, you are losing spark, My suggestion is the cranks shaft sensor on bell housing.
Second, install a pressure gage on the test port on the fuel rail and watch it as you start the engine, fuel pressure should not drop as the engine dies, if it does, the pump is not working correctly. There are two modes of power to that pump, one to start and timed, for only a few seconds to prime the system, and one to run continuously. Find the wires going to the pump at the tank. Connect test light to those wires and watch what happens during crank and at stall, You should not have the pump shut off and the engine dies.
If you have spark, and fuel pump working, when did you last change the filter,,but I put that LAST.
It has to be one or the other of these.
Good Luck

Aug 04, 2008 | 2000 Jeep Cherokee

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