The OBD code B1858 indicates a fault with the Climate Control A/C Pressure Switch circuit.
Symptoms include the Engine Light being ON.
The issue is commonly caused by a faulty Climate Control A/C Pressure Switch or related wiring issues.
While not a critical problem, it should be addressed promptly.
To fix it, inspect the wiring harness, connectors, and switch for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the b1858 OBD Code
The vehicle’s airbag warning light is illuminated on the dashboard.
- Symptoms: Service Airbag Warning Light ON.
- Airbag system may not deploy in a crash.
- Horn may not work.
Causes of the b1858 OBD Code
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B1858 code typically indicates a problem with the seat belt buckle switch circuit.
- B1858 can be caused by a faulty Climate Control A/C Pressure Switch.
- A Climate Control A/C Pressure Switch harness that is open or shorted.
- A Climate Control A/C Pressure Switch circuit with poor electrical connection.
- Or a faulty Body Control Module (BCM).
Fixing Error Code b1858 Step By Step
To resolve fault code B1858, address the issue with the driver’s airbag circuit.
- To fix OBDII code B1858, first, review the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the code.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Repair or replace any damaged wiring or connectors found during the inspection.
- Clear the fault code using a scan tool.
- Test drive the vehicle to ensure the code does not return.
Cost Of Fixing b1858 Fault Code
Repairing fault code B1858 typically involves replacing the driver airbag squib circuit open.
The cost to diagnose and fix OBD code B1858 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. Factors like shop rates and complexity can affect the final cost.
Details of the b1858 OBD Code
Code B1858 relates to a problem with the airbag passenger presence sensor.
OBD code B1858 means a fault has been detected in the airbag system’s passenger airbag indicator circuit.
This code is triggered by the airbag control module (ACM) when it detects a problem with the circuit responsible for illuminating the passenger airbag indicator light on the dashboard.
The signal or system involved is the circuit that monitors the status of the passenger airbag indicator light.
Mechanic’s Tech Notes
Code B1858 indicates a problem with the driver’s airbag circuit resistance being too high.
OBDII code B1858 indicates a communication error between the TCM (Transmission Control Module) and the ECM (Engine Control Module).
To diagnose this, check the TCM power and ground using a multimeter.
Use a scan tool to confirm if the TCM communicates over the CAN network.
Visually inspect the wiring harness and connectors for any damage, and check for broken, bent, or corroded pins.
Reflashing the modules may be necessary to resolve the issue.
FAQ
OBD code B1858 indicates an issue with the Climate Control A/C Pressure Switch circuit. Check for faulty switch, wiring, or BCM. Inspect and repair as needed.
Diagnose OBD code B1858 by checking for a faulty Climate Control A/C Pressure Switch, open/shorted harness, poor electrical connection, or faulty BCM. Inspect wiring and connectors for damage.
Common symptoms of OBD code B1858 include Engine Light ON. To fix, check Climate Control A/C Pressure Switch, harness, connectors for damage, and repair as needed.
Wrap Up
If your vehicle is displaying OBD code b1858, you may experience issues with the airbag system, such as the airbag warning light staying on or the airbags not deploying in a collision.
This code typically indicates a problem with the driver’s airbag circuit, possibly caused by a faulty clock spring, damaged wiring, or a malfunctioning airbag module.
To address OBD code b1858, start by inspecting the wiring harness and connectors associated with the driver’s airbag system.
Check for any visible damage, corrosion, or loose connections.
If no issues are found, further
