Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2018F-150 XLT, 4D PICKUP EXTRA CAB, 3.5L ENG VIN G, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)QUICK LOOKUPSDTC INDEXDTC INDEX (ENGINE COOLING SYSTEM - MULTIFUNCTION ELECTRONIC MODULES)FOUR WHEEL DRIVE (4WD) SYSTEM DTCSVEHICLES WITH: 2-SPEED TORQUE ON DEMAND TRANSFER CASE
2018 Ford F-150 XLT, 4D Pickup Extra Cab, 3.5L Eng VIN G, RWD
Vehicles With: 2-Speed Torque On Demand Transfer Case
2018 Ford F-150 XLT, 4D Pickup Extra Cab, 3.5L Eng VIN G, RWDSECTION Vehicles With: 2-Speed Torque On Demand Transfer Case
Diagnostics in this article assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .
DTC INDEX
| DTC | Description | Action |
|---|---|---|
| C1979:00 | IWE Solenoid Circuit Failure: No Sub Type Information | GO to Pinpoint Test C |
| C1979:11 | IWE Solenoid Circuit Failure: Circuit Short To Ground | GO to Pinpoint Test C |
| C1979:12 | IWE Solenoid Circuit Failure: Circuit Short To Battery | GO to Pinpoint Test C |
| C1979:13 | IWE Solenoid Circuit Failure: Circuit Open | GO to Pinpoint Test C |
| P0562:00 | System Voltage Low: No Sub Type Information | GO to Pinpoint Test B |
| P0563:00 | System Voltage High: No Sub Type Information | GO to Pinpoint Test B |
| P1812:00 | 4-Wheel Drive Mode Select Circuit Failure: No Sub Type Information | GO to Pinpoint Test E |
| P1815:00 | 4-Wheel Drive Mode Select Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test E |
| P06B8:00 | Internal Control Module Non-Volatile Random Access Memory (NVRAM) Error: No Sub Type Information | CLEAR the DTC. REPEAT the self-test. If the DTC still sets, INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . |
| P1825:00 | 4-Wheel Drive Clutch Relay Open Circuit: No Sub Type Information | GO to Pinpoint Test K |
| P1826:00 | 4-Wheel Drive Low Clutch Relay Circuit To Battery: No Sub Type Information | GO to Pinpoint Test K |
| P1827:00 | 4-Wheel Drive Low Clutch Relay Circuit To Ground: No Sub Type Information | GO to Pinpoint Test K |
| P1839:00 | Transfer Case Shift Motor Open Circuit: No Sub Type Information | GO to Pinpoint Test L |
| P1840:00 | Transfer Case Shift Motor Short Circuit To Battery: No Sub Type Information | GO to Pinpoint Test L |
| P1841:00 | Transfer Case Shift Motor Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test L |
| P1849:00 | Transfer Case Contact Plate 'A' Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test M |
| P184B:00 | Transfer Case Unable To Transition Between 4X4 High and 4X4 Low Range: No Sub Type Information | REFER to: Transfer Case - Vehicles With: 2-Speed Torque On Demand Transfer Case . |
| P1853:00 | Transfer Case Contact Plate 'B' Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test M |
| P1857:00 | Transfer Case Contact Plate 'C' Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test M |
| P185A:00 | Differential Lock-Up Input Switch Circuit High: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P185B:00 | Differential Lock-Up Indicator Circuit Low: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P185C:00 | Differential Lock-Up Indicator Circuit High: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P185D:00 | Differential Lock-Up Control Circuit Performance: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P1861:00 | Transfer Case Contact Plate 'D' Short Circuit To Ground: No Sub Type Information | GO to Pinpoint Test M |
| P1867:00 | Transfer Case Contact Plate General Circuit Failure: No Sub Type Information | GO to Pinpoint Test M |
| P187A:00 | Transfer Case Control Module System Voltage Low - Rear Locking Differential Disabled | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P187C:00 | Differential Lock-Up Control Circuit/Open: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P187D:00 | Differential Lock-Up Control Circuit Low: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P187E:00 | Differential Lock-Up Control Circuit High: No Sub Type Information | REFER to: Electronic Locking Differential (ELD) With: Ford 8.8 . |
| P1886:00 | 4X4 Initialization Failure: No Sub Type Information | CLEAR the DTC. REPEAT the self-test. If the DTC still sets, CONFIRM the TCCM part number is correct for the vehicle. |
| P1891:00 | Transfer Case Contact Plate Ground Return Open Circuit: No Sub Type Information | GO to Pinpoint Test M |
| U0100:00 | Lost Communication With ECM/PCM "A": No Sub Type Information | GO to Pinpoint Test F |
| U0101:00 | Lost Communication With TCM "A": No Sub Type Information | GO to Pinpoint Test I |
| U0121:00 | Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information | GO to Pinpoint Test G |
| U0140:00 | Lost Communication With Body Control Module (BCM): No Sub Type Information | GO to Pinpoint Test H |
| U0418:00 | Invalid Data Received From Brake System Control Module: No Sub Type Information | To diagnose the wheel speed sensor concern, REFER to: Anti-Lock Brake System (ABS) And Stability Control . |
| U2300:54 | Central Configuration: Missing Calibration | This DTC sets if one or more expected configuration data identifications is missing (gearbox type, tire circumference) from the BCM. CARRY OUT a self-test of the BCM. If DTCs are present, REFER to: Body Control Module (BCM) . If no DTCs are present, CARRY OUT a self-test. If U2300:54 returns, INSTALL a new TCCM. |
| U2300:55 | Central Configuration: Not Configured | This DTC sets upon power up only until all expected configuration data parameters (gearbox type, axle ratio, tire circumference) are received from the BCM. CARRY OUT a self-test of the BCM. If DTCs are present, REFER to: Body Control Module (BCM) . If no DTCs are present, CLEAR the DTCs. CARRY OUT self-test. If U2300:55 returns, INSTALL a new Terrain Management Module. |
| U2300:56 | Central Configuration: Invalid / Incompatible Configuration | This DTC sets if a expected configuration data parameter is out of range (gearbox type, axle ratio, tire circumference) from the BCM. CARRY OUT a self-test of the BCM. If DTCs are present, REFER to: Body Control Module (BCM) . If no DTCs are present, CARRY OUT a self-test. If U2300:56 returns, INSTALL a new Terrain Management Module. |
| U2300:64 | Central Configuration: Signal Plausibility Failure | This DTC sets if the expected axle ratio or tire circumference is out of range from the BCM. CARRY OUT a self-test of the BCM. If DTCs are present, REFER to: Body Control Module (BCM) . If no DTCs are present, CARRY OUT a self-test. If U2300:64 returns, INSTALL a new Terrain Management Module. |
| U3000:04 | Control Module: System Internal Failure | CLEAR the DTC. REPEAT the self-test. If DTC U3000:04 is retrieved again, INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . |
| U3000:41 | Control Module: General Checksum Failure | CLEAR the DTC. REPEAT the self-test. If DTC U3000:41 is retrieved again, INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . |
| U3000:46 | Control Module: Calibration / Parameter Memory Failure | CLEAR the DTC. REPEAT the self-test. If DTC U3000:46 is retrieved again, INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . |
| U3000:49 | Control Module: Internal Electronic Failure | CLEAR the DTC. REPEAT the self-test. If DTC U3000:49 is retrieved again, INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . |
| U300D:11 | Ignition Input On/Start: Circuit Short To Ground | GO to Pinpoint Test A |
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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.