CAB 000158.03 – High Voltage in CAB Switched Supply

CAB 000158.03 (CAB 158.03)

Code: 000158.03

Shortcode: 158.03


This error code CAB 000158.03 indicates that the CAB control unit has detected an abnormally high voltage in the switched battery supply from the Cab Load Center wakeup circuit. Such high voltage levels can pose risks of damage to electronic components and affect the overall functionality of the CAB system.


In response to this high voltage condition, the control system enters a state of limited functionality. This mode restricts certain operations to prevent damage and maintain safety until the issue is resolved.


  • Inspect Electrical Connections and Components: Check all connections within the Cab Load Center for tightness and integrity. Inspect for any damaged or worn components that might contribute to voltage irregularities.
  • Measure and Document Voltage Levels: Using a digital multimeter, measure the voltage levels in the switched supply circuit. Document these readings to help identify patterns or specific conditions causing the high voltage.
  • Examine Voltage Regulators and Distribution Panels: Focus on voltage regulators and distribution panels that manage the supply to the CAB control unit. Replace or repair any faulty components.
  • Implement Voltage Stabilization Measures: If persistent high voltage is a problem, consider installing additional voltage stabilization hardware to protect sensitive electronic systems.
  • System Reset and Functional Testing: After repairs and modifications, reset the CAB system to clear fault codes and restore normal operation. Conduct a full functional test to ensure all systems operate within their designated parameters without recurring high voltage issues.


Frequent checks and maintenance of the electrical supply system are essential to detect early signs of overvoltage, which can prevent costly repairs and downtime. Implementing systematic voltage monitoring can also help in maintaining the stability and reliability of the CAB system.

Control Units: John Deere

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