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Anonymous
Anonymous Posted on Aug 09, 2011
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What is error code p1686 on jeep Cherokee 2001

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  • Posted on Aug 09, 2011
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Hello lhernandez79,

The P-1686 is NO SKIM BUS MESSAGE RECEIVED.

SKIM stands for Smart Key Immobilizer Module.

One way I have solved this code is to disconnect the battery for about five minutes this resets the module.

I hope this helps.

Regards,

netvan

  • Anonymous Aug 09, 2011

    I did that but it goes bck to the same error message?

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Jeep 2001 jeep grand cherokee v8 4x4 Laredo code p1686 code showing up...
Hey There...I am not a Mechanic and cannot answer all your questions, but I did not see in your statement where you disabled or removed the skim (Sentry key immobilizer module) prior to installing the new PCM. Even if you have the Skim de-programmed in the PCM, you must unplug or preferably remove the skim or it will immediately reset the PCM when you connect it to the car. The skim is the module under the steering column with the little halo that that goes around the ignition. If you did not disable the skim you will have to have the PCM deprogrammed again. If none of this helps, I apologize. I am just learning about all this myself.
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Hello, I have a jeep liberty 2002, I have p1686 runs and takes two seconds to turn off,, please if you can help me, thanks
you are swapping PCM's that be real bad.
on newer cars with Security this causes it to think your are a thief
and bricks the PCM (skim rules 101)
"until the pcm use in another jeep" huh?
SKIM is Phissed off.
http://www.jeepforum.com/forum/f9/trouble-code-p1686-905620/
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What does the code 1686 mean for a jeep grand cherokee
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P1686


did the immo lamp glow.
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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.
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Dec 29, 2013 • 1999 Jeep Grand Cherokee
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Error code p1686
either the chip in the key is bad (try the other key) or the receiver on the back of the ignition is bad. If both keys dont work there is nothing you can do but have it towed to the dealer.They have to replace and reprogram the unit and the keys! I am sorry.
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Dec 02, 2013 • 2001 Jeep Grand Cherokee
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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.
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2000 jeep grand cherokee laredo showing code p1686, p1687, p1688, geuges go down, all warning lights come on, with time, the geuges comes on, and the warning lights come off, all but the security key...
Diagnostic Fault Code (DTC) P1686 has a generic description of "No SKIM Bus Nessage Received".
Diagnostic Fault Code (DTC) P1687 has a generic description of "No Instrument Cluster Bus Message"

P1688 is either not a valid code for your vehicle, or the manufacturer failed to provide specific information for it.
Basically, what is going on here is that you have a problem in your computer network communication bus. Or to put it more simply, the "phone line" is down. Your computers in your vehicle are having problems talking to each other.

"SKIM" stands for Sentury Key Imobilizer Module (AKA security module). The Instrument cluster and the SKIM are not communicating with the Powertrain Control Module (PCM) for sure, and possibly also not communicating with the Body Control Module (BCM). There may also be problems with other modules that share the same data lines.
This MUST be diagnosed with a scan tool that can access the entire computer network. You must find out which modules can communicate with the scanner and which ones cannot. This is necessary to determine the possible location of the fault.
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Nov 07, 2011 • 1999 Jeep Cherokee
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P1686 is a SKIM (Sentry Key Immobilizer Module) no signal code. The keys have tiny chips in them that have to match the SKIM module for that vehicle, if they dont match then the engine will stop running after a few seconds. This is to keep theives from making a key and driving away with you vehicle.
First of all, do you have 2 keys? If so try the other one, if it works, then the other sentry key (the one that didn't work before) 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 it sends a signal to pcm allowing start up to complete with no shutdown. If this unit is bad, unfortunuately just replacing it is no help, because after replacement a DEALER must then program both the unit and your keys. Make sure you give the dealer both keys, as both have to be reprogrammed to the new unit, if only one is done, the other will not work.
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