Control Module Input Power B Circuit Intermittent/Erratic

Where it lives

For U3507, the circuit described runs through the module. The description of U3507 reports a fault at the module.

Check these first

• A loose or chafed wire on the input power B circuit
• A corroded or backed out input power B connector pin
• A failing ground that makes input power B signal jump
• A weak battery or charging system

What to do next

1. Read input power B voltage on a scan tool while wiggling the harness
2. Inspect the input power B wiring for chafing and loose pins
3. Test the input power B circuit for intermittent opens
4. Check the battery and charging system
5. Repair the wiring or replace the module if the signal stays erratic
6. Clear the code and retest

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