OBD code C1939 indicates an issue with the Brake Pressure Switch (BPS) in the AntiLock Brake System (ABS).
Symptoms include the ABS Warning Light and Engine Light being illuminated.
The problem is commonly caused by a faulty BPS or related wiring issues.
While not a severe issue, it should be addressed promptly.
A possible fix involves inspecting and repairing the BPS and its wiring 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 c1939 OBD Code
The vehicle displays communication issues with the steering angle sensor module, indicated by fault code C1939.
- Symptoms: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Possible loss of ABS functionality.
- Unusual noises from the ABS system.
- Difficulty maintaining traction in slippery conditions.
Causes of the c1939 OBD Code
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Possible triggers for fault code C1939 include issues with the vehicle’s steering angle sensor.
- C1939 can be caused by a faulty Brake Pressure Switch (BPS).
- A Brake Pressure Switch (BPS) harness that is open or shorted.
- A Brake Pressure Switch (BPS) circuit with poor electrical connection.
Fixing Error Code c1939 Step By Step
Address the communication bus fault by checking wiring, connectors, and modules for proper operation.
- To fix OBDII code C1939, first, review the possible causes related to the code.
- Visually inspect the wiring harness and connectors associated with the ABS control module.
- Check for any damaged components and ensure the connector pins are not broken, bent, pushed out, or corroded.
- If no issues are found with the wiring and connectors, proceed to test the ABS control module for proper operation.
- Consider reprogramming or replacing the module if necessary to resolve the C1939 fault code.
Cost Of Fixing c1939 Fault Code
Diagnosing and repairing fault code C1939 may involve testing and replacing various vehicle components.
The cost to diagnose and fix OBD code C1939 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 c1939 OBD Code
Code C1939 relates to a steering angle sensor circuit fault in the vehicle’s system.
OBD code C1939 means a communication bus fault has been detected in the vehicle’s network.
This code is triggered by the body control module (BCM) when it detects a loss of communication with one or more control modules on the network.
The communication bus involved in this fault is typically the Controller Area Network (CAN) bus, which allows different modules in the vehicle to communicate with each other.
When C1939 is set, it indicates a problem with the data communication between modules on the CAN bus, which can lead to various electrical system malfunctions in the vehicle.
Mechanic’s Tech Notes
Code C1939 relates to a communication error between the body control module and the instrument cluster.
OBDII code C1939 relates to a communication error between the body control module (BCM) and the electronic brake control module (EBCM).
To diagnose this, use a scan tool to check for any other related trouble codes and to monitor data parameters between the BCM and EBCM.
Visually inspect the wiring harness and connectors for any damage or corrosion.
Test the TCM power and ground using a multimeter.
Ensure proper communication over the CAN network by checking for any network faults.
Reflashing the modules may be necessary to resolve the communication issue.
FAQ
OBD code C1939 indicates an issue with the Brake Pressure Switch (BPS) circuit. Check BPS, wiring, and connectors for faults to resolve ABS and Engine warning lights.
Common symptoms of OBD code C1939 include ABS warning light and engine light on. Causes may be faulty BPS or wiring issues. Inspect and repair as needed.
Diagnose OBD code C1939 by checking Brake Pressure Switch (BPS) and its wiring for faults. Inspect connectors for damage or corrosion. Fix as needed.
Wrap Up
If your ABS warning light is illuminated and you retrieve OBDII code c1939, it may indicate a fault in the brake pressure transducer circuit.
This could be caused by a damaged wiring harness, a faulty brake pressure transducer, or poor electrical connections.
To address OBDII code c1939, inspect the wiring harness for any visible damage, test the connectors for proper connection and corrosion, and replace the brake pressure transducer if necessary.
Be sure to clear the code after completing repairs to reset the system.
