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.
2003 Mazda B2300 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Transfer Case DTCS
TRANSFER CASE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
| B1313 | Battery Saver Relay Coil - Circuit Failure |
| B1315 | Battery Saver Relay Coil Circuit Short to Battery |
| C1728 | Transfer Case Unable to Transition Between 2H and 4H |
| C1729 | Transfer Case Unable to Transition Between 4H and 4L |
| P0500 | Vehicle Speed Signal Circuit Failure |
| P1812 | 4x4 Shift Control Switch Circuit Open |
| P1815 | 4x4 Shift Control Switch Circuit Short to Ground |
| P1820 | Transfer Case CW Shift Relay Coil Circuit Open or Short to Ground |
| P1822 | Transfer Case CW Shift Relay Coil Short to Power |
| P1824 | 4WD Electronic Clutch Relay Circuit Open or Short to Ground |
| P1826 | 4WD Electronic Clutch Relay Short to Power |
| P1828 | Transfer Case CCW Shift Relay Coil Circuit Open or Short to Ground |
| P1830 | Transfer Case CCW Shift Relay Coil Short to Power |
| P1838 | Transfer Case Shift Motor Circuit Failure |
| P1846 | Transfer Case CONTACT PLATE "A" Circuit Open |
| P1850 | Transfer Case CONTACT PLATE "B" Circuit Open |
| P1854 | Transfer Case CONTACT PLATE "C" Circuit Open |
| P1858 | Transfer Case CONTACT PLATE "D" Circuit Open |
| P1863 | Transfer Case CONTACT PLATE Power Circuit Open |
| P1866 | Transfer Case System Concern |
| P1867 | Transfer Case Contact Plate General Circuit Failure |
| P1891 | Transfer Case Contact Plate Ground Return Circuit 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.
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