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GTECH Calibration
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P1197

Key Off Voltage Low.

  • Lincoln
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
1
AreaFuel and air metering
97
FaultThe specific fault in that area

What it means

P1197 on a Lincoln means Key Off Voltage Low. The powertrain control module saw the voltage supplied to it, or a monitored circuit, fall below its expected threshold when the ignition was switched off. The exact circuit and threshold vary by model and engine, so check the workshop data for the vehicle.

Symptoms

  • Malfunction indicator lamp on
  • Slow or reluctant cranking after the car has stood
  • Intermittent starting problems
  • Other stored low-voltage or communication codes
  • Radio, clock or other memory settings lost

Possible causes

  • Weak or discharged battery, or a battery that will not hold its chargelikely
  • Corroded, loose or dirty battery terminals or earth connectionslikely
  • Parasitic drain keeping voltage down after the key is offpossible
  • Poor charging performance from the alternator or its wiringpossible
  • Damaged wiring, poor connector contact or a voltage drop in the power feed to the control modulepossible
  • Fault inside the powertrain control module or its power relay circuitrare

How to diagnose

  1. Read all stored codes and the freeze frame data, then note whether other voltage-related codes are present.
  2. Check the battery terminals, main earth straps and the module power and earth connections for corrosion, looseness or damage.
  3. Test battery state of charge and condition with a proper battery tester, and charge it first if it is low.
  4. Measure battery voltage at rest, during cranking and with the engine running to check charging output.
  5. Carry out a parasitic drain test with the ignition off and the vehicle asleep, then isolate circuits to find any excess draw.
  6. Voltage-drop test the power and earth feeds to the control module and the relay supplying it.
  7. Check for any technical service bulletins or software updates for the specific model and engine.
  8. Clear the code and retest to see if it returns after the vehicle has stood with the key off.

How to fix

  • Charge or replace the battery if it fails testing.
  • Clean and tighten the battery terminals and earth connections, and repair any damaged earth strap.
  • Find and repair the cause of any excess parasitic drain.
  • Repair or replace a faulty alternator or its wiring.
  • Repair damaged wiring or connectors in the control module power supply.
  • Replace or reprogram the control module only after the supply and earth circuits are proven good, or if a manufacturer update applies.

Can I keep driving?

Low severity

The car can usually be driven, but a weak battery or charging fault may leave you stranded. Have it checked soon, especially if starting is getting worse.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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