U2421 – Invalid Data Received from Vehicle Dynamics Control Module.
The ODBII code U2421 indicates that the vehicle’s control module has received invalid or erroneous data from the Vehicle Dynamics Control Module, which may affect the vehicle’s stability and handling systems.
The severity of ODBII code U2421 is generally considered moderate.
Common Causes For: U2420 U2420: Vehicle Speed Signal Communication Error
- Faulty Vehicle Dynamics Control Module (VDCM)
- Communication issues between modules
- Damaged wiring or connectors
- Corrupted software or firmware in the VDCM
- Faulty sensors related to vehicle dynamics
- Low battery voltage or electrical issues
- Interference from aftermarket modifications or devices
Common misdiagnosis for U2421 Invalid Data Received from Vehicle Dynamics Control Module.
- ABS Module Failure
- Wheel Speed Sensor Issues
- Traction Control System Malfunction
- Powertrain Control Module (PCM) Issues
- Faulty Wiring or Connectors
- Steering Angle Sensor Problems
- Incorrect Tire Pressure or Size
- Electronic Stability Control (ESC) Malfunction
Common Troubleshooting Steps
When dealing with the OBD-II code U2421, which indicates “Invalid Data Received from Vehicle Dynamics Control Module,” it’s important to follow a systematic approach to troubleshoot the issue. Here are some common troubleshooting steps:
- Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue.
- Inspect Wiring and Connectors: Examine the wiring and connectors related to the Vehicle Dynamics Control Module (VDCM). Look for signs of damage, corrosion, or loose connections that could affect communication.
- Verify Power and Ground: Ensure that the VDCM is receiving proper power and ground. Use a multimeter to check voltage and ground continuity at the module’s connector.
- Check for Software Updates: Sometimes, the issue can be resolved with a software update. Check with the vehicle manufacturer or a dealership to see if there are any updates available for the VDCM.
- Inspect the Vehicle Dynamics Control Module: If the wiring and connections are good, the issue may lie within the VDCM itself. Inspect the module for any physical damage or signs of failure.
- Clear Codes and Test Drive: After performing any repairs or inspections, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
- Check for Interference: Ensure that there are no aftermarket devices or modifications that could interfere with the VDCM’s operation or communication.
- Consult Technical Service Bulletins (TSBs): Look for any TSBs related to the specific make and model of the vehicle. Manufacturers often release TSBs for known issues that can provide guidance on troubleshooting.
- Perform a Network Test: If the problem persists, consider testing the communication network (CAN bus) for faults. Use a scan tool capable of monitoring the network for issues.
- Seek Professional Help: If you are unable to resolve the issue after following these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle and its systems. By following these steps, you can systematically identify and address the root cause of the U2421 code.