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Home / DTC / P1625 — Voltage to Vehicle Load Control Module Fan Circuit Not Detected

P1625 — Voltage to Vehicle Load Control Module Fan Circuit Not Detected

Detailed page for trouble code P1625.

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22,491specific
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Code

P1625

LINCOLN P — Powertrain

Voltage to Vehicle Load Control Module Fan Circuit Not Detected

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

Causes

  • Blown fuse or fusible link feeding the VLCM/fan circuit
  • Faulty fan power relay or relay control circuit
  • Open or shorted wiring between battery/fuse/relay and VLCM or fan
  • Corroded/loose connector at VLCM or fan motor
  • Failed fan motor (open or high resistance)
  • Poor or missing ground at VLCM or fan motor

Symptoms

  • Engine cooling fan(s) do not run when commanded
  • Engine may run hotter than normal or overheat at idle
  • Reduced A/C cooling performance when stopped
  • Cooling fan(s) run intermittently or not at all
  • A stored P1625 and possibly related fan-circuit DTCs

What to check

  • Retrieve freeze-frame data and pending codes with a scan tool; record conditions when the code set
  • Visually inspect fuses, fusible links and relays related to VLCM and cooling fans
  • Visually inspect wiring, connectors and harnesses for corrosion, damage, chafing or disconnected connectors at the fan(s) and VLCM
  • Check battery voltage (key on and engine running) to ensure proper supply (approx. 12–14.5 V)
  • With key ON (engine off) and fan command active via scan tool, measure voltage at the fuse/relay output and at the VLCM/fan connector
  • Check ground continuity at the VLCM and fan motor connector (ground should be near 0 V)

Signal parameters

  • Battery/supply voltage at fuse or relay: approx. 12.0–14.5 V (key on/engine running)
  • Control signal to fan driver: either switched 12 V or PWM from module — may vary between 0–12 V duty cycle depending on command
  • Fan motor resistance: typically low (fractions of an ohm to a few ohms); consult OEM spec for exact value
  • Ground potential at connector: ~0 V
  • When commanded on with scan tool: supply or control signal should be present at the VLCM/fan connector (verify using a multimeter or oscilloscope)
  • Note: exact voltages, PWM frequency and resistance values vary by model/year — consult vehicle-specific wiring diagrams and service data

Diagnostic algorithm

  1. Confirm the code and record freeze-frame data. Check for related stored codes (P0480–P0484, etc.).
  2. Visually inspect fuses, fusible links and relays for the cooling fan / VLCM power. Replace any blown fuses and retest.
  3. Inspect connectors and wiring at the VLCM and cooling fan(s) for corrosion, loose pins, damaged insulation or melted wires. Repair as needed.
  4. Verify battery voltage at the fan power fuse/relay input with key ON and engine running. If low, correct charging/battery issues first.
  5. With a scan tool, command the fan ON. Measure for voltage at the relay output, VLCM connector and at the fan motor connector. If voltage present at relay but not at VLCM/fan connector, trace wiring between relay and VLCM/fan.
  6. Check ground continuity for the fan motor and VLCM ground circuits to chassis. Repair any poor ground connections.
  7. Remove the fan motor connector and measure motor resistance. Bench-test the fan by applying fused 12 V directly to the motor to confirm it runs. If motor fails, replace motor.
  8. If fan motor and supply/ground are good but control signal is absent or incorrect, verify VLCM outputs with a diagnostic tool and inspect or replace VLCM if internal driver is faulty.
  9. After repairs, clear codes, command fan on/off with scan tool and perform an operational test (idle and with A/C on) to confirm the fan operates and no code returns.

Likely causes

  • Blown fuse or relay supplying VLCM/fan
  • Damaged wiring harness or pin corrosion at connector to VLCM or fan
  • Failed fan motor (does not spin under direct 12V)
  • Failed VLCM output driver

Fault status

⚠️ Status
Voltage to Vehicle Load Control Module fan circuit not detected — fan circuit supply/control voltage absent or open when fan was commanded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

P0480 P0481 P0482 P0483 P0484
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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