LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Jeep >> 2024 >> Compass Trailhawk >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS U0109 To U02A9 >> DTC Troubleshooting >> U012D-Lost Communication With Alternator Control Module >> Possible Causes
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Possible Causes

Possible Causes
LIN BUS CIRCUIT OPEN OR SHORTED
FUSED B+ CIRCUIT OPEN
POOR GROUND THROUGH ALTERNATOR CASE
ALTERNATOR
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .