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Q: does my jeep need a new computer or is it something else? on 1999 Jeep Grand Cherokee

there are times my gauges on the jeep that do not work and all the lights are on, heater and a/c does not work, sometimes the light of the not the right key turns on and now the alarm control does not want to unlock or lock my doors and the jeep starts but does not stay on. I took in when the check engine light was on and all it said was a miss communication error. Please I would to fix the problem. TYhanks
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