John Deere 000158.03 – Multiple: Voltage To Module Over 16 Volts

The electrical system's switched power supply circuit has exceeded the 16-volt threshold. Normal operating voltage is typically between 13.5 and 14.5 volts when the engine is running. This overvoltage condition indicates an electrical supply issue, usually an overcharging alternator, which can damage sensitive electronic components and control modules. The system logs this fault as a protective measure to alert the operator of the potentially harmful electrical environment.

• 6110R
• 6120R
• 6130R
• 6140R
• 6145R
• 6150R
• 6155R
• 6170R
• 6175R
• 6190R
• 6195R
• 6210R
• 6215R
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 9230
• 9330
• 9430
• 9530
• 9630
• 7720
• 7820
• 7920
• 6105M

1. 1

   Cycle the ignition key off and then on again to verify if the fault is intermittent

2. 2

   Visually inspect the battery and alternator for physical damage, corrosion on terminals, or an accumulation of debris, ensuring all connections are clean and tight

3. 3

   Measure system voltage directly at the battery terminals with the engine running (a reading significantly above 14.8 volts confirms a system-wide overcharging condition)

4. 4

   Check for other active fault codes that may provide more specific information about the location of the fault

5. 5

   Inspect the power supply wiring to the affected module for any signs of damage, such as chafing, pinching, or corrosion, which could lead to a short circuit

1. 1

   Test and replace alternator

   If diagnostic checks indicate a system-wide overcharging issue (voltage significantly above 14.8V), perform a comprehensive alternator test. If the internal voltage regulator is found to be faulty, replace the entire alternator assembly.

2. 2

   Inspect module and wiring

   If the over-voltage condition is not system-wide and appears isolated to the Front Chassis Module (PTF), inspect the module and its electrical connectors for damage or corrosion. Check the wiring harness for shorts to power leading to the PTF module.

3. 3

   Replace Front Chassis Module

   If the alternator and wiring are confirmed to be in good condition and the fault persists, the issue likely lies within the Front Chassis Module itself. Replace the module.