Climate Control A/C Pressure Switch harness is open or shorted
Climate Control A/C Pressure Switch circuit poor electrical connection
Faulty Body Control Module (BCM)
|How to Fix the B1858 Code?
Start by checking 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.
The cost to diagnose the B1858 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.