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.
2002 Mazda B4000 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Transfer Case DTCS
TRANSFER CASE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| P1812 | 4WD Shift Control Switch Ckt. Failure |
| P1815 | 4WD Shift Control Switch Ckt. Short To Ground |
| P1820 | Transfer Case Shift Relay Ckt. Failure |
| P1822 | Transfer Case Shift Relay Coil Ckt. Short To Voltage |
| P1824 | 4WD Electric Clutch Relay Ckt. Failure |
| P1826 | 4WD Electric Clutch Relay Ckt. Short To Voltage |
| P1828 | Transfer Case Shift Relay Coil Ckt. Failure |
| P1830 | Transfer Case Shift Relay Coil Ckt. Short To Voltage |
| P1832 | Transfer Case Diff. Lockup Solenoid Ckt. Failure |
| P1833 | Transfer Case Diff. Lockup Solenoid Ckt. Open |
| P1834 | Transfer Case Diff. Lockup Solenoid Ckt. Short To Voltage |
| P1835 | Transfer Case Diff. Lockup Solenoid Ckt. Short To Ground |
| P1838 | Transfer Shift Motor Ckt. Failure |
| P1846 | Transfer Case Contact "A" Ckt. Failure |
| P1850 | Transfer Case Contact "B" Ckt. Failure |
| P1854 | Transfer Case Contact "C" Ckt. Failure |
| P1858 | Transfer Case Contact "D" Ckt. Failure |
| P1863 | Transfer Case Contact Plate Power Ckt. Open |
| P1866 | Transfer Case System Concern-Servicing Required |
| P1867 | Transfer Case Contact Plate-General Ckt. Failure |
| P1878 | Transfer Case Diff. Disengage Solenoid Ckt. Failure |
| P1879 | Transfer Case Diff. Disengage Solenoid Ckt. Open |
| P1880 | Transfer Case Diff. Disengage Solenoid Ckt. Short To Voltage |
| P1885 | Transfer Case Diff. Disengage Solenoid Ckt. Short |
| P1891 | Transfer Case Contact Ground Return Ckt. Open |
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.