Code Definition

P1197 — Key off voltage low

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Ford

About P1197

P1197 is a manufacturer-specific powertrain diagnostic trouble code recorded for Ford vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1197 is stored, the module has detected a signal or supply voltage lower than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1197 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This Ford code relates to the keep alive or key off supply voltage that certain modules receive directly from the battery to maintain memory, security functions, and quick restart readiness while the ignition is off. DTC P1197 is set when the module detects that this key off voltage has dropped too low during the period the vehicle is parked and the key is off. The usual causes are a weak or failing battery, poor battery cable and feed connections, or an excessive parasitic drain pulling the system voltage down after the vehicle sleeps. Left unaddressed, the low key off voltage can eventually ...

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