2002 Lincoln Navigator 4WDFACTORY OEM SERVICE PROCEDURE

Transfer Case DTCS

TRANSFER CASE DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description Perform Test
B1483 Brake Pedal Input Circuit Failure C
B1485 Brake Pedal Input Circuit Battery Short C
B1577 Lamp Park Input Circuit Short to Battery REFER to WARNING SYSTEMS
B2105 Throttle Position Input Out of Range Low B
B2106 Throttle Position Input Out of Range High B
C1107 ABS Function Enabled Input Circuit Failure A
P0500 Vehicle Speed Sensor Malfunction C
P1812 Transmission 4 -Wheel Drive Mode Select Circuit Failure REFER to SYMPTOM CHART .
P1815 Transmission 4 -Wheel Drive Mode Select Short Circuit to Ground C
P1820 Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure B
P1822 Transmission Transfer Case Clockwise Shift Relay Coil Short Circuit to Battery B
P1824 Transmission 4-Wheel Drive Clutch Relay Circuit Failure A
P1826 Transmission 4 -Wheel Drive Low Clutch Relay Circuit to Battery A
P1828 Transmission Transfer Case Counter Clockwise Shift Relay Coil Circuit Failure B
P1830 Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit to Battery B
P1836 Transmission Transfer Case Front Shaft Speed Sensor Circuit Failure A
P1837 Transmission Transfer Case Rear Shaft Speed Sensor Circuit Failure A
P1838 Transmission Transfer Case Shift Motor Circuit Failure REFER to SYMPTOM CHART .
P1846 Transmission Transfer Case Contact Plate 'A' Circuit Failure REFER to SYMPTOM CHART .
P1850 Transmission Transfer Case Contact Plate 'B' Circuit Failure REFER to SYMPTOM CHART .
P1854 Transmission Transfer Case Contact Plate 'C' Circuit Failure REFER to SYMPTOM CHART .
P1858 Transmission Transfer Case Contact Plate 'D' Circuit Failure REFER to SYMPTOM CHART .
P1866 Transmission Transfer Case System Concern - Servicing Required REFER to SYMPTOM CHART .
P1867 Transmission Transfer Case Contact Plate General Circuit Failure REFER to SYMPTOM CHART .
P1874 Transmission Automatic Hall Effect Sensor Power Circuit Failure A
P1875 Transmission Automatic Hall Effect Sensor Power Circuit Short to Battery REFER to tSYMPTOM CHART .
P1891 Transmission Transfer Case Contact Plate Ground Return Open Circuit REFER to SYMPTOM CHART .
P1892 Trans. Automatic 4-Wheel Drive 4x4 Mechanical Lock Output Circuit Failure B
P1893 Trans. Auto. 4-Wheel Drive 4x4 Mechanical Lock Output Short to Battery B
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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