My speedometer goes wonky at times


Asked by Oct 25, 2014 at 04:47 PM about the 1998 Jeep Grand Cherokee Limited

Question type: Maintenance & Repair

While driving sometimes my speedometer will shoot over to the 100 mph like it is broken
(no change of course in actual speed of car) then the car  wants to shutter and die or it
wont shift properly -   
looking at replacing pcm - P56044513AC is part number, will this work on the car or will it
mess up my bcm?  Help

4 Answers


I think you jumping the gun here, it sounds like you have a sensor problem, I recommend getting a shop do a live data scan and hope they can get it to act up while it is connected to the scanner. Could be the speed sensor.


Already replaced OOS and the input speed sensor problem is intermittent just had shop run tests they did circuit check from the sensors to pcm with no problems - also checked connectors and they are good.


What is your Vehicle info? Had same exact problem on 98 Jeep Grand Cherokee 4.0. BCM checks VIN on PCM and if differnt it will not start. Did all the same replacements/checks. After talking over with half a dozen of my mechanic buddies - pretty sure it my PCM. Becarefull about used and online stores/ebay. A lot of them get really bad reviews or are a complete ripoff with forged 5 star ratings. I used these people below and they seem great so far and one of the only few sites that didn't try to sell me something that they didn't tell me needed addition programing or flat just would not work (for mine you can us a 98 on 96 & 97 but not a 96-97 on a 98). ams auto module source Davies FL 4690 SW 83rd Terrace Davie, FL 33328 (954) 279-2040 BTW - Could have got a Cardone at Rock Auto but they could not program it. According to you vehicle might want to check them out too - Hope this save some time and frustration!

1 out of 1 people think this is helpful.

Wonky - That's a Technical term - Right;) My Control Modulal P/N was also P56044513AC Good Luck - Keep ya Posted!

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