Differential Fluid Pressure
Table of contents
C1858 Possible Causes
- Faulty Differential Solenoid Valve
- Faulty Differential Fluid Pressure Sensor
- Differential Fluid Pressure Sensor harness is open or shorted
- Differential Fluid Pressure Sensor circuit poor electrical connection
How do I fix code C1858?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- DTC C1858-72: Differential Fluid Pressure Deviation Low
- DTC C1858-73: Differential Fluid Pressure Deviation High
Cost of diagnosing the C1858 code
The cost of diagnosing the C1858 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C1858 Description
The AWD Control Unit monitors the Differential Fluid Pressure. The AWD Control Unit sets the OBDII code when the Differential Fluid Pressure is not to factory specifications.
