Generator Load Input Low (Ford)
What does P1245 mean?
The P1245 code means the vehicle's onboard diagnostic system has detected: Generator Load Input Low (Ford). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Idle speed slightly higher than normal
- Battery not charging fully
- Dim headlights at idle
- Electrical accessories operating slowly
Probable Causes (Ranked by Likelihood)
- Alternator undercharging due to worn brushes Very High
- Open circuit in alternator field control wire High
- Loose or corroded alternator connector Moderate
- Slipping alternator belt Moderate
- PCM alternator control driver failure Low
Step-by-Step Diagnostic Procedure
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Measure alternator output voltage at battery with engine running
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Check alternator field control wire continuity to PCM
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Inspect alternator connector for corrosion or loose pins
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Verify belt tension and condition at alternator pulley
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Test alternator output under load with a carbon pile tester
Frequently Asked Questions
What does generator load input low mean?
P1245 means the PCM detects the alternator load signal is below expected, usually indicating insufficient electrical output from the alternator.
Can a bad battery cause P1245?
A severely degraded battery can affect charging feedback, but P1245 more commonly points to an alternator problem. Test both for accurate diagnosis.
Will P1245 cause other problems?
If left unrepaired, the low charging output can drain the battery, cause hard starting, and affect fuel economy due to idle speed compensation.