Question about Chrysler Cars & Trucks

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P1687 code twice within a day the check engine light came on and the speedometer and tachometer quit working, went to zero. After sitting for an hour and a half after last drive that the issue occurred, the car started fine for a two minute ride, then would start and immediately shut off after being off for 5 min. the car has sat for four hours and will not even turn over. If I leave the key turned to the on position the check engine light comes on and finally spits out codes P1684 and p1687, and continues not to start, but allows the codes to be drawn from the on-off-on-off-on key trick.

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  • Richard Smith Jul 30, 2013

    sorry for not being more specific, the code came from where the digital odometer is. The car is a 98 concorde, code p1684 is the battery being disconnected within last 50 starts, and the P1687 is "No CCD/J1850 messages recieved from the Mechanical Instrument Cluster (MIC) module." Between the time I posted this question and your reply i went out, the car started, i moved it back to my house and let it sit idling. The check engine light kept turning on and off, while it was on the gauges read that i was at 0 RPM and that the motor was cold (they were not working at all), however, the gas gauge worked fine. After trying to pull the codes again while the check engine light was on by doing the on-off-on-off-on key trick, i got no code and could not start the car again. From what i am seeing on other sites and other posts on here it seems that the BCM is bad, does this make sense in the case of my car?

  •  Stephen
    Stephen Jul 31, 2013

    Your definitions are different from what I have from Chrysler. I think I would want to hook up a real scanner and check for codes again before making any decisions.

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  • Chrysler Master
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Code 1684 is not on the list for Chrysler cars, code 1687 is for the battery voltage dropping below 10 volts. This can occur if the voltage actually does drop below 10 or if the battery is disconnected from the computer.
It could be a wiring problem between the key switch and the main fuse box.

Posted on Jul 30, 2013

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Posted on Jan 02, 2017

  • 1453 Answers

SOURCE: 1994 Grand Cherokee, 5.2 V8 shuts off when hot.

Your engine computer is bad. It's a good thing that you mentioned about the check engine light dying also, as this is a classic sign of a bad ecm. I have repaired more than one of these Jeep computers, replacing the three power capacitors located inside the computer, and they have worked for years afterwards. If you don't have the skills or knowledge to repair the ecm, get yourself a rebuilt ecm unit and swap it out.

Posted on Sep 28, 2010

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