OBD code C0121 indicates a fault in the Electronic Brake Control Module (EBCM) system.
Symptoms include the ABS warning light and engine light being illuminated.
This issue is commonly caused by a faulty EBCM, open/shorted EBCM harness, or poor electrical connection.
It is crucial to address promptly to ensure safe braking operation.
A possible fix involves inspecting and repairing any damaged wiring or connectors related to the EBCM.
| 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 c0121 OBD Code
The vehicle displays an illuminated ABS warning light on the dashboard.
- Symptoms for OBD code C0121 may include: AntiLock Brake System (ABS) Warning Light ON.
- Engine Light ON (or Service Engine Soon Warning Light).
- Brakes may feel different when applied.
- Unusual noises from the ABS system.
- Reduced braking performance.
Causes of the c0121 OBD Code
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Possible reasons for fault code C0121 include issues with the ABS pump motor circuit.
- C0121 can be caused by a faulty Electronic Brake Control Module (EBCM).
- An open or shorted Electronic Brake Control Module (EBCM) harness.
- A poor electrical connection in the Electronic Brake Control Module (EBCM) circuit.
Fixing Error Code c0121 Step By Step
Resolve fault code C0121 by inspecting the ABS module and repairing any damaged wiring or connections.
- To fix OBDII code C0121, start by reviewing the possible causes mentioned above.
- Visually examine the wiring harness and connectors related to the ABS system.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Test the wheel speed sensors for proper operation and signal output.
- Inspect the ABS module for any signs of damage or corrosion.
- Reset the ABS module using a professional scan tool if necessary.
- Replace the ABS module if all other components check out and the issue persists.
Cost Of Fixing c0121 Fault Code
The repair for fault code C0121 typically involves diagnosing and fixing issues with the ABS system.
The cost to diagnose and fix OBD code C0121 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.
Costs depend on labor rates, shop fees, and the complexity of the issue.
Details of the c0121 OBD Code
C0121 indicates an issue with the ABS/TCS wheel speed sensor circuit.
OBD code C0121 means there is an issue with the ABS/TCS system.
This code is triggered by the Electronic Brake Control Module (EBCM) when it detects a malfunction in the Antilock Brake System (ABS) hydraulic pump motor circuit.
The C0121 code specifically relates to a problem with the pump motor circuit.
Mechanic’s Tech Notes
Code C0121 indicates a possible issue with the ABS/TCS system’s brake switch circuit.
OBDII code C0121 typically indicates an issue with the Electronic Brake Control Module (EBCM) relay circuit.
To diagnose, use a voltmeter to check power and ground connections to the EBCM.
Scan tools can help verify communication over the Controller Area Network (CAN) network.
Inspect wiring harnesses and connectors for damage, and check for broken, bent, or corroded pins.
Reflashing the module may be necessary.
FAQ
OBD code C0121 indicates an issue with the Electronic Brake Control Module (EBCM). Symptoms include ABS and Engine warning lights. Check wiring and connectors for faults.
Common symptoms of OBD code C0121 include ABS warning light on, engine light on, caused by faulty EBCM or related wiring issues. Inspect and repair as needed.
Diagnose and repair OBD code C0121 by checking for a faulty EBCM, open/shorted harness, or poor electrical connection. Inspect wiring and connectors for damage or corrosion.
Wrap Up
If your ABS light is on and you see OBDII code c0121, it may indicate a faulty wheel speed sensor, damaged wiring harness, or poor electrical connection in the ABS system.
This can lead to inaccurate wheel speed readings and affect ABS operation.
To address OBDII code c0121, inspect the wheel speed sensor and its wiring for any visible damage.
Test the sensor’s resistance and check the connectors for corrosion or looseness.
Replace the sensor if necessary and ensure proper connection to resolve the issue.
