The OBD code B1990 indicates an issue with the Pedal Forward/Rearward Potentiometer circuit in the Body Control Module (BCM).
Symptoms include the Engine Light being ON.
The cause could be a faulty potentiometer, wiring harness issues, or a faulty BCM.
This is a moderate issue.
To fix it, inspect the wiring harness, connectors, and components for 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 b1990 OBD Code
The vehicle displays an airbag warning light on the dashboard with fault code B1990 stored.
- Symptoms: Airbag warning light illuminated.
- Chime sound when starting the vehicle.
- Airbag system may not deploy in a collision.
Causes of the b1990 OBD Code
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B1990 code typically indicates a fault in the driver side sidemount airbag circuit.
- B1990 can be caused by a faulty Pedal Forward Potentiometer.
- A faulty Rearward Potentiometer.
- An open or shorted Pedal Forward Potentiometer harness.
- An open or shorted Pedal Rearward Potentiometer harness.
- A poor electrical connection in the Pedal Forward Potentiometer circuit.
- A poor electrical connection in the Pedal Rearward Potentiometer circuit.
- A faulty Body Control Module (BCM).
Fixing Error Code b1990 Step By Step
To address fault code B1990, inspect and repair the driverside side airbag circuit as needed.
- To fix OBDII code B1990, start by reviewing 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.
- If no issues are found with the wiring and connectors, proceed to test the component or system associated with the code for proper operation.
- Replace the faulty component if necessary.
- Clear the fault code from the vehicle’s computer using a scan tool.
- Test drive the vehicle to ensure the code does not return, indicating a successful repair.
Cost Of Fixing b1990 Fault Code
Diagnosing and repairing fault code B1990 may involve inspecting and replacing the occupant classification system components.
The cost to diagnose and fix OBD code B1990 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour.
The total cost will vary based on shop rates, complexity of the issue, and any additional parts or services needed.
Details of the b1990 OBD Code
B1990 code indicates a fault in the driverside side airbag circuit.
OBD code B1990 means a fault has been detected in the driver side sidemount airbag circuit.
This code is triggered by the Restraints Control Module (RCM) when it detects an issue with the driver side airbag circuit.
The RCM monitors the circuit for faults such as open circuits, short circuits, or high resistance.
When this fault is detected, it sets code B1990 and illuminates the airbag warning light on the instrument panel to alert the driver of an issue with the driver side airbag system.
Mechanic’s Tech Notes
For fault code B1990, refer to detailed diagnostic information for troubleshooting and repair guidance.
OBDII code B1990 indicates a problem with the Transmission Control Module (TCM).
To diagnose, check TCM power and ground using a multimeter.
Use a scan tool to confirm TCM communication over the CAN network.
Inspect wiring harness and connectors for damage, and check connector pins for issues like corrosion or bending.
Reflashing the TCM might be necessary to resolve the issue.
FAQ
OBD code B1990 indicates an issue with the Pedal Forward/Rearward Potentiometer circuit. Check for faulty components, wiring harness, or poor connections.
Common symptoms of OBD code B1990 include Engine Light ON, caused by issues like faulty pedal potentiometer or BCM. Fix involves inspecting wiring and connectors.
Diagnose and repair OBD code B1990 by checking pedal potentiometer, harness, and BCM. Inspect wiring for damage or poor connections. Fix as needed.
Wrap Up
If your airbag warning light is on and you see OBDII code b1990, it may indicate a fault in the driverside side airbag circuit.
This could be caused by a malfunctioning driverside side airbag module, faulty wiring connections, or a damaged clock spring.
To address OBDII code b1990, check the wiring harness and connectors for any signs of damage or corrosion.
Test the driverside side airbag module and clock spring for proper functionality.
Replace any components that are found to be faulty to resolve the issue effectively.
