The OBD code C0021 indicates a fault in the Brake Booster Pressure Sensor Circuit.
Symptoms include the ABS warning light and engine light being illuminated.
This issue is commonly caused by a faulty brake booster or vacuum pressure sensor.
It is crucial to address promptly to ensure proper brake system function.
To fix, inspect the wiring harness, connectors, and sensor components 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 c0021 OBD Code
The ABS warning light is illuminated on the dashboard.
- Symptoms: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Possible loss of ABS functionality.
- Brake pedal may feel different when braking.
- Unusual noises coming from the ABS module.
Causes of the c0021 OBD Code
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Possible triggers for fault code C0021 include issues with the front right wheel speed sensor.
- C0021 can be caused by a faulty Brake Booster.
- A faulty Vacuum Pressure Sensor.
- An open or shorted Vacuum Pressure Sensor harness.
- A poor electrical connection in the Vacuum Pressure Sensor circuit.
Fixing Error Code c0021 Step By Step
Inspect the wheel speed sensor and its wiring for any damage or corrosion.
- To fix OBDII code C0021, start by reviewing the possible causes mentioned above and visually examining the corresponding wiring harness and connectors.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Test the wheel speed sensor for proper operation and signal output.
- Inspect the tone ring for damage or missing teeth.
- Replace the wheel speed sensor if necessary.
- Clear the fault codes and test drive the vehicle to verify the repair.
Cost Of Fixing c0021 Fault Code
Repairing fault code C0021 typically involves replacing the right front wheel speed sensor on most vehicles.
The cost to diagnose and fix OBD code C0021 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
The total cost depends on labor rates, shop fees, and the complexity of the ABS system in the vehicle.
Details of the c0021 OBD Code
Code C0021 indicates a problem with the right front wheel speed sensor circuit.
OBD code C0021 means that the right front wheel speed sensor signal is erratic.
This code is triggered by the Electronic Brake Control Module (EBCM) when it detects inconsistencies in the signal coming from the right front wheel speed sensor.
The wheel speed sensors are a crucial part of the ABS system, providing data on wheel speed to the EBCM for proper antilock brake system operation.
Mechanic’s Tech Notes
Code C0021 indicates a problem with the right front wheel speed sensor circuit.
To diagnose and fix OBDII code C0021, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.
Verify TCM communication over the Controller Area Network (CAN) using a scan tool.
If communication issues are found, reprogramming or reflashing the TCM may be necessary.
Additionally, inspect the wiring harness and connectors for any damage, and ensure connector pins are not broken, bent, pushed out, or corroded.
This thorough inspection will help identify and address the root cause of the C0021 fault code.
FAQ
Common symptoms of OBD code C0021 include ABS warning light and engine light on. Causes may be faulty brake booster or vacuum pressure sensor. Fix: Inspect wiring and connectors.
Possible causes of OBD code C0021: Faulty brake booster, faulty vacuum pressure sensor, open/shorted sensor harness, poor electrical connection. Inspect wiring, connectors, and components for damage.
Diagnose OBD code C0021 by checking for faulty brake booster, vacuum pressure sensor issues, or wiring problems. Inspect and repair damaged components or connectors.
Wrap Up
If your ABS light is on and you see OBDII code c0021, it may indicate a faulty right front wheel speed sensor, damaged wiring harness, or poor electrical connection at the sensor.
This can lead to inaccurate wheel speed readings and affect ABS system performance.
To address OBDII code c0021, inspect the right front wheel speed sensor and its wiring for any visible damage.
Test the sensor’s electrical connection and repair or replace any faulty components.
Ensure proper sensor alignment and secure wiring connections to resolve the issue.
