C0505moderate severityChassis
Transfer Case Position Sensor Circuit
on 2020 Mazda Mazda3 2.0L I4 · AWD
What this code means
Malfunction in the sensor that reports the current transfer case range position.
Symptoms
- 4WD indicator not showing correct mode
- Service 4WD light
- Transfer case may not shift
- Unknown drive mode selected
Common causes
- Faulty position sensor
- Sensor wiring damage
- Transfer case not fully engaged in any position
- Sensor contaminated with fluid
Diagnostic steps
- Read transfer case position with scan tool
- Command mode change and watch sensor response
- Inspect sensor wiring
- Check transfer case fluid level and condition
- Test sensor resistance or voltage
Repair notes
Replace transfer case position sensor. Check fluid condition.
Other Chassis codes on this vehicle
C0021
LF Wheel Speed Sensor Range/Performance
C0022
RF Wheel Speed Sensor Range/Performance
C0023
LR Wheel Speed Sensor Range/Performance
C0024
RR Wheel Speed Sensor Range/Performance
C0025
LF Wheel Speed Sensor Circuit Intermittent
C0026
RF Wheel Speed Sensor Circuit Intermittent
C0027
LR Wheel Speed Sensor Circuit Intermittent
C0028
RR Wheel Speed Sensor Circuit Intermittent
C0035
Left Front Wheel Speed Sensor Circuit
C0036
Left Front Wheel Speed Signal Erratic