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.
2004 Ford Explorer 4.0 K, AWDFACTORY OEM SERVICE PROCEDURE
Transfer Case
4X4 CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| B1317 | Battery Voltage High | 4x4 Module (PCM) | REFER to BATTERY & CHARGING SYSTEM . |
| B1318 | Battery Voltage Low | 4x4 Module (PCM) | REFER to BATTERY & CHARGING SYSTEM . |
| B1319 | Driver Door Ajar Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| B1322 | Driver Door Ajar Circuit Short To Ground | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| B1342 | ECU is Defective | 4x4 Module (PCM) | CLEAR the DTCs. REPEAT the 4x4 module (PCM) self-test. If DTC B1342 is retrieved, INSTALL a new 4x4 module (PCM). REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE . CLEAR the DTCs. REPEAT the self-test. |
| B1483 | Brake Pedal Input Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| B1485 | Brake Pedal Input Short to Battery | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| C1729 | Transfer Case Unable to Transition Between 4H and 4L | 4x4 Module (PCM) | Go To PINPOINT TEST E . |
| C1970 | 4WD Low Mode Switch LED Short to Battery | 4x4 Module (PCM) | Go To PINPOINT TEST F |
| C1971 | 4WD Low Mode Switch LED Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST F |
| P1707 | Transfer Case Neutral or Park/Neutral Indication Circuit | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| P1812 | Transmission 4-Wheel Drive Mode Select Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST F |
| P1815 | Transmission 4-Wheel Drive Mode Select Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST F |
| P1816 | Transmission NEUTRAL Safety Switch Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| P1819 | Transmission NEUTRAL Safety Switch Circuit Short to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST G |
| P1820 | Transfer Case Clockwise Shift Relay Coil Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST F |
| P1822 | Transfer Case Clockwise Shift Relay Coil Circuit Short To Battery | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1824 | 4-Wheel Drive Clutch Relay Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST B |
| P1826 | 4-Wheel Drive Low Clutch Relay Short Circuit to Battery | 4x4 Module (PCM) | Go To PINPOINT TEST B |
| P1827 | 4-Wheel Drive Low Clutch Relay Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST B |
| P1828 | Transfer Case Counterclockwise Shift Relay Coil Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1830 | Transfer Case Counterclockwise Shift Relay Coil Circuit Short To Battery | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1849 | Transfer Case Contact Plate A Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1853 | Transfer Case Contact Plate B Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1857 | Transfer Case Contact Plate C Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1861 | Transfer Case Contact Plate D Short Circuit to Ground | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1867 | Transfer Case Contact Plate General Circuit Failure | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| P1891 | Transfer Case Contact Plate Ground Return Open Circuit | 4x4 Module (PCM) | Go To PINPOINT TEST E |
| U1900 | CAN Communication BUS Fault | 4x4 Module (PCM) | REFER to MODULE COMMUNICATIONS NETWORK . |
| U2023 | External Node Fault | 4x4 Module (PCM) | REFER to MODULE COMMUNICATIONS NETWORK . |
| U2051 | One Or More Calibration Files Missing / Corrupt | 4x4 Module (PCM) | Reprogram/Reflash the 4x4 module. REFER to MODULE COMMUNICATIONS NETWORK . |
| - | For All Other DTCs | 4x4 Module (PCM) | REFER to MODULE COMMUNICATIONS NETWORK . |
Factory Service Tools
Use the Manual With the Right Hardware
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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.