U1402 – Invalid Data Received from Anti-lock Brake System (ABS) Control Module.

The ODBII code U1402 indicates that the vehicle’s control module has received invalid or erroneous data from the Anti-lock Brake System (ABS) control module.

The severity of ODBII code U1402 is generally considered moderate.

Common Causes For: U1401 Invalid Data Received from the Transmission Control Module (TCM).

• Faulty ABS control module
• Corrupted data communication
• Damaged wiring or connectors
• Faulty wheel speed sensors
• Low battery voltage
• Software issues or updates needed
• Grounding issues in the ABS system
• Intermittent electrical connections

Common misdiagnosis for U1402 Invalid Data Received from Anti-lock Brake System (ABS) Control Module.

• Faulty ABS Control Module
• Wiring issues or short circuits
• Faulty wheel speed sensors
• Incorrectly calibrated or faulty speedometer
• Issues with the Engine Control Module (ECM)
• Problems with the powertrain control module (PCM)
• Faulty brake pedal position sensor
• Incorrectly installed or damaged ABS pump
• Software or firmware issues in the ABS module
• Battery or charging system problems

Common Troubleshooting Steps

When dealing with the OBD-II code U1402, which indicates “Invalid Data Received from Anti-lock Brake System (ABS) Control Module,” there are several common troubleshooting steps you can follow to diagnose and potentially resolve the issue. Here’s a structured approach:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Codes related to the ABS or other systems can provide additional context.
• Inspect Wiring and Connectors: **Visual Inspection: Check the wiring and connectors related to the ABS control module for any signs of damage, corrosion, or loose connections.
• **Connector Pins: Ensure that the pins in the connectors are not bent or corroded.
• Check the ABS Control Module: **Functionality: Verify that the ABS control module is functioning correctly. This may involve checking for proper power and ground at the module.
• **Reprogramming: In some cases, the ABS module may need to be reprogrammed or updated.
• Inspect the CAN Bus: Since U1402 is a communication-related code, check the Controller Area Network (CAN) bus for issues. Look for:
• Short circuits
• Open circuits
• Faulty modules on the bus
• Use a multimeter or oscilloscope to check for proper voltage levels and signal integrity on the CAN lines.
• Check for Ground Issues: Ensure that the ABS module has a good ground connection. Poor grounding can lead to communication errors.
• Test the ABS Module: If possible, perform a bench test on the ABS control module to ensure it is functioning correctly. This may require specialized equipment.
• Clear Codes and Test Drive: After performing inspections and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the ABS system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes.
• Seek Professional Help: If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician who has experience with ABS systems and can perform more advanced diagnostics.
• Consider Module Replacement: If all else fails and the ABS control module is determined to be faulty, replacement may be necessary.Conclusion Troubleshooting OBD-II code U1402 involves a systematic approach to identify and resolve communication issues between the ABS control module and the vehicle’s computer systems. Always ensure safety and follow manufacturer guidelines when working on vehicle electronics.