94 Jeep Grand Cherokee. Replacing PCM. Does it need to be programed or just installed bought an aftermarket unit? (Engine Indicator Lights Jeep Grand Cherokee Electrical Sensors)

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Question Details Asked:Dec 29, 2010 - 12:54 PMStatus:Closed

patches9149	94 Jeep Grand Cherokee. Replacing PCM. Does it need to be programed or just installed bought an aftermarket unit? Bought a Borg Warner replacement unit, states PCM might need to relearn. Or is it just bolt on and unit will relearn? Or is there a process for it?
	In Maintenance & Repair > Engine > Indicator Lights In Makes & Models > Jeep > Grand Cherokee In Maintenance & Repair > Electrical > Sensors 1 answer - 605 days ago
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jeffhickman 09/28/11 11:06 pm PST

When they say "relearn", they just mean the PCM will adjust itself to the parameters of your car. It uses sensor data to basically fine tune itself. You do not have to have it programmed.

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