Generator Voltage Sense Circuit A Range/Performance

Check these first

• A chafed or open wire in the generator voltage sense circuit
• Corrosion in the generator sense connector at the alternator
• A failing alternator voltage regulator skewing the sense reading
• A weak battery pulling reference voltage below spec
• A loose or slipping alternator belt

What to do next

1. Measure charging voltage at the battery at idle and at 2,000 rpm
2. Check the sense wire from the alternator to the PCM for opens and chafes
3. Inspect the generator sense connector for corrosion or water
4. Compare the PCM sense reading against a meter at the alternator
5. Replace the voltage regulator or alternator if the sense voltage is off
6. Clear the code and retest

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