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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 552 (DTCS P0642 To P1593) >> Diagnosis And Testing >> P0643-Primary 5-Volt Supply Circuit High >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
(F855) PRIMARY 5-VOLT SUPPLY SHORTED TO BATTERY VOLTAGE
PCM

Always perform the  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  before proceeding. 

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