HVAC - Without Climate Control

HVAC DTC Troubleshooting: 13

DTC indicator 13: HVAC Control Unit Internal Error

NOTE: Check the battery condition Testing and Inspection and the charging system. Charging System Indicator Circuit Troubleshooting

1. Turn the ignition switch to LOCK (0), and then to ON (II).

2. Do the self-diagnostic function with the HVAC control unit. How to Troubleshoot the Heating and A/C Systems

3. Check for DTCs.

Is DTC 13 indicated?
YES - The HVAC control unit is faulty, replace the HVAC control unit. HVAC Control Unit Removal/Installation (Without Climate Control)

NO - Intermittent failure, the HVAC control unit is OK at this time. Check for poor connections at the HVAC control unit and at G401.