P1197
Key Off Voltage Low (Diesel)
Findings, check these first
- Discharged batteries
- Parasitic drain overnight
- Corroded cable ends
- Failing battery with a dead cell
- Controller sense wiring fault
Standard procedure
- Charge and load-test the batteries
- Test for parasitic drain
- Clean cable connections
- Verify voltage at the controller
- Replace failing batteries
Code lookup
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Sources and review
Review: qualified. Read the source limits below.
- OBDII.pro: P1197 Ford definition
live reference page (obdii.pro)
Supports: Ford-family meaning for P1197: Key Off Voltage Low
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Last updated 2026-09-05.
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