OBD code C1438 indicates an issue with the Transfer Case Differential Clutch in the Final Drive Control Module (FDCM) of the vehicle’s AntiLock Brake System (ABS).
Symptoms include the ABS and Engine warning lights being illuminated.
The problem is commonly caused by a worn Transfer Case Differential Clutch or a faulty FDCM.
This issue should be addressed promptly to ensure safe braking operation.
A possible fix involves inspecting the wiring harness, connectors, and components for any damage or corrosion.
| 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 c1438 OBD Code
The vehicle displays an ABS warning light on the dashboard with fault code C1438 stored.
- With OBD code C1438, symptoms may include: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Unusual noises coming from the wheel area.
- Decreased braking performance.
- Difficulty maintaining control during braking.
Causes of the c1438 OBD Code
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Possible issues related to fault code C1438 include faulty wheel speed sensor or damaged wiring.
- C1438 can be caused by a worn Transfer Case Differential Clutch.
- A faulty Transfer Case Assembly.
- A faulty Final Drive Control Module (FDCM).
Fixing Error Code c1438 Step By Step
Resolve fault code C1438 by inspecting the steering angle sensor for proper alignment and functionality.
- To fix OBDII code C1438, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the steering angle sensor system.
- 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 steering angle sensor for proper operation.
- Replace the steering angle sensor if it fails the test.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Test drive the vehicle to verify that the C1438 code does not return.
Cost Of Fixing c1438 Fault Code
Diagnosing and repairing fault code C1438 may involve inspecting and replacing the steering angle sensor.
The cost to diagnose and fix OBD code C1438 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the general cost could be between $75 and $150. The final cost may vary based on shop rates and the complexity of the repair.
Details of the c1438 OBD Code
C1438 indicates an issue with the vehicle’s brake pressure sensor circuit.
OBD code C1438 means Vehicle Speed Sensor A/B Correlation.
This code is triggered when there is a discrepancy between the signals from two vehicle speed sensors, typically located in the transmission or wheel hubs.
The ECM compares the signals from these sensors to ensure they are in sync, and if a correlation issue is detected, it will trigger the C1438 fault code.
This code is related to the vehicle’s stability control system, as accurate speed sensor data is crucial for proper operation of systems like ABS and traction control.
Mechanic’s Tech Notes
Code C1438 indicates an issue with the left front wheel speed sensor circuit.
To diagnose OBDII code C1438, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.
If communication issues are found, reprogramming or reflashing the TCM may be necessary.
Visually inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection can help identify and resolve the root cause of the C1438 fault code.
FAQ
OBD code C1438 indicates an issue with the Transfer Case Differential Clutch or Final Drive Control Module. Check wiring harness, connectors, and components for damage.
Common symptoms for OBD code C1438 include ABS warning light and engine light on. Possible causes are worn transfer case clutch, faulty transfer case, or FDCM.
Diagnose OBD code C1438 by checking for worn transfer case clutch, faulty transfer case or FDCM. Inspect wiring harness, connectors, and pins for damage or corrosion.
Wrap Up
If your ABS warning light is illuminated and you retrieve OBDII code c1438, it may indicate a fault with the brake pressure sensor circuit in the hydraulic unit.
This could be caused by a damaged sensor, wiring issue, or a faulty connection within the system.
To address OBDII code c1438, start by inspecting the wiring harness and connectors related to the brake pressure sensor.
Look for any signs of damage, corrosion, or loose connections.
Test the sensor itself for proper operation and replace if necessary to resolve the issue.
