P1149
Alternator 2 High Input
Findings, check these first
- Second alternator overcharging
- Failed voltage regulator in the second unit
- Poor battery cable connection forcing overcompensation
- Field circuit shorted high
- Mismatched replacement alternator
Standard procedure
- Measure charging voltage at each alternator
- Inspect battery cables and grounds
- Check field control for shorts to power
- Verify correct replacement part number
- Replace the overcharging unit
Code lookup
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Sources and review
Review: qualified. Read the source limits below.
- OBDII.pro: P1149 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1149: GENERATOR 2 MONITOR CIRCUIT HIGH
Fetched directly. obdii.pro is a publisher independent of the engine-codes family.
Last updated 2026-09-05.
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