TSC 000168.03 – Control Unit, Supply Voltage Too High

TSC 000168.03 (TSC 168.03)

Code: 000168.03

Shortcode: 168.03

Description:

This diagnostic trouble code, TSC 000168.03, is triggered when the control unit detects a supply voltage (battery) exceeding 16 volts. High supply voltage can occur due to issues with the charging system or battery.

Reaction:

When this error occurs, the control unit may protect itself by shutting down or entering a safe mode to prevent damage from the high voltage.

Recommendations:

Inspect Battery and Charging System:

  • Check Battery Voltage:
    • Measure the battery voltage to ensure it is within the normal operating range (usually between 12.6 and 14.4 volts when the engine is running).
    • Replace the battery if it is faulty or overcharging.
  • Check Alternator and Voltage Regulator:
    • Inspect the alternator and voltage regulator for proper operation.
    • Replace any components that are causing overcharging.

Ensure Proper Electrical Connections:

  • Check Wiring and Connectors:
    • Inspect all electrical connections between the battery, alternator, and control unit for damage or corrosion.
    • Repair or replace faulty wiring and connectors.

Note:

Maintaining the charging system and ensuring all electrical components are functioning correctly can prevent high voltage conditions. Regularly monitor battery health and alternator performance to avoid such issues.


Control Units: John Deere