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Home >> Jeep >> 2024 >> Wagoneer Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 53 (3.0L - DTCS U05AA-00 To U11E9-00) >> DTC Troubleshooting >> U0623-00-Lost Communication With Coolant Pump "A" >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2024 Jeep Grand Wagoneer L and 2024 Jeep Grand Wagoneer. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes
FUSED B+ CIRCUIT OPEN OR SHORTED TO GROUND
GROUND CIRCUIT OPEN/HIGH RESISTANCE
LIN BUS CIRCUIT OPEN/HIGH RESISTANCE
LIN BUS CIRCUIT SHORTED TO GROUND
LIN BUS CIRCUIT SHORTED TO VOLTAGE
AUXILIARY COOLANT PUMP
POWERTRAIN CONTROL MODULE (PCM)

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