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Home / DTC / P1196 — Key Off Voltage High

P1196 — Key Off Voltage High

Detailed page for trouble code P1196.

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Code

P1196

LINCOLN P — Powertrain

Key Off Voltage High

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or leaking voltage regulator in alternator
  • Ignition switch or key-off wiring stuck in on/partial-on position
  • Short or wiring fault energizing circuits with key off
  • Aftermarket electronics (alarms, stereos, battery isolators) incorrectly wired
  • Faulty body control module (BCM) or powertrain control module (PCM) voltage sensing circuit
  • Poor ground or corroded battery/connector terminals causing erroneous voltage readings

Symptoms

  • Stored P1196 (Key Off Voltage High) on scan tool
  • Battery drains or reduced cranking capacity after parking
  • Interior lights, accessories, or modules remain powered after key removed
  • Battery warning lamp or charging system warnings displayed
  • Vehicle not going to sleep (modules stay awake), possible parasitic current present

What to check

  • Scan for related DTCs and view freeze-frame / live data around the event
  • Measure static battery voltage with ignition OFF at battery terminals and at PCM/BCM harness
  • Measure charging voltage with engine running (expect ~13.5–14.8 V)
  • Perform parasitic draw test (ammeter in series) with vehicle asleep; typical draw
  • Visually inspect battery, grounds, main power/ignition fuses and fusible links for corrosion or damage
  • Disconnect/isolated suspect circuits (pull fuses one at a time) to find circuit that changes voltage/draw

Signal parameters

  • Battery resting voltage (key OFF): typically 12.4–12.8 V
  • Charging voltage (engine RUNNING): typically 13.5–14.8 V
  • Key-off sensed module voltage: should match battery resting voltage within a few tenths of a volt
  • Parasitic current with vehicle asleep: typically
  • Voltage measured at PCM/BCM ignition/feed pins with key OFF: should be near battery voltage and not elevated above charge voltage

Diagnostic algorithm

  1. Retrieve and record all related DTCs and freeze-frame data. Note when code sets and conditions.
  2. Visually inspect battery, main power junctions, fusible links and grounds. Clean/secure as needed.
  3. With ignition OFF and vehicle allowed to go to sleep, measure battery terminal voltage. Compare with voltage at module power/voltage sense pins.
  4. Start engine and measure alternator/charging voltage. Confirm regulator behavior under load.
  5. Turn engine OFF and immediately monitor voltage at battery and module pins to see if voltage remains elevated.
  6. Perform parasitic draw test: connect ammeter between negative battery post and cable, observe current after modules sleep. If high, pull fuses one at a time to isolate circuit causing draw.
  7. Inspect ignition switch and related harness for continuity and for any wires that may be feeding power with key OFF.
  8. Disconnect aftermarket devices and retest to rule out non‑OEM equipment.
  9. If wiring and peripherals check good, test or replace suspect modules (BCM/PCM) per OEM diagnostic procedures or consult wiring diagrams for voltage sense circuits.
  10. Clear codes and retest to verify repair. Document any intermittent conditions and advise customer about possible intermittent module faults.

Likely causes

  • Alternator/regulator allowing higher than normal voltage back into vehicle when engine off
  • Ignition switch contacts or retention circuit not opening fully (key-off feed still live)
  • Aftermarket accessory drawing or feeding power into vehicle networks with key off
  • Faulty BCM/PCM voltage sense or internal short in control module

Fault status

⚠️ Status
Key Off Voltage High — module detected higher-than-expected system voltage with ignition OFF. May indicate charging, wiring, ignition switch, aftermarket device or module sensing fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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