Control Module Input Power A Circuit Low

Where it lives

For U3501, the circuit described runs through the module. The description of U3501 reports a fault at the module.

Check these first

• A short to ground on the input power A circuit
• High resistance in the input power A feed
• A weak battery or charging system
• A failed module that reads input power A low

What to do next

1. Read input power A voltage on a scan tool
2. Test the input power A circuit for a short to ground
3. Measure voltage at the input power A pin
4. Check the battery and charging system voltage
5. Repair the circuit or replace the module if the voltage stays low
6. Clear the code and retest

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