U1269 – Invalid or Missing Data from the PCM.

The ODBII code U1269 indicates that there is invalid or missing data being received from the Powertrain Control Module (PCM), which may affect the vehicle’s performance and diagnostics.

The severity of OBDII code U1269 is generally considered moderate to severe.

Common Causes For: U1268 Invalid Data Received from the Anti-Lock Brake System (ABS) Control Module.

• Faulty PCM (Powertrain Control Module)
• Poor electrical connections or wiring issues
• Corroded connectors
• Faulty sensors (e.g., engine, transmission)
• Issues with the CAN bus communication
• Short circuits or open circuits in the wiring harness
• Software or firmware issues in the PCM
• Battery voltage problems or poor ground connections

Common misdiagnosis for U1269 Invalid or Missing Data from the PCM.

• Faulty PCM (Powertrain Control Module)
• Wiring issues or shorts in the data communication lines
• Bad ground connections
• Faulty sensors (e.g., throttle position sensor, mass airflow sensor)
• Corrupted software or firmware in the PCM
• Issues with the OBDII connector or communication port
• Problems with other control modules (e.g., BCM, TCM)
• Battery or charging system issues
• Faulty or damaged connectors and terminals
• Intermittent electrical issues or loose connections

Common Troubleshooting Steps

The OBD-II code U1269 indicates “Invalid or Missing Data from the PCM” (Powertrain Control Module). This code typically points to communication issues between the PCM and other modules in the vehicle. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing related codes can help in diagnosing the root cause.
• Inspect Wiring and Connectors:
• Check the wiring harness and connectors related to the PCM and other modules for any signs of damage, corrosion, or loose connections.
• Pay special attention to ground connections, as poor grounding can lead to communication issues.
• Check Battery Voltage:
• Ensure that the vehicle’s battery is fully charged and in good condition. Low voltage can cause communication problems.
• Check for any parasitic draws that may be affecting the battery voltage.
• Inspect the PCM:
• Ensure that the PCM is securely mounted and that all connectors are properly seated.
• Look for any signs of physical damage or water intrusion in the PCM.
• Test Communication Lines:
• Use a multimeter or an oscilloscope to test the communication lines (CAN bus) for continuity and proper voltage levels.
• Check for short circuits or open circuits in the communication lines.
• Check for Software Updates:
• Verify if there are any available software updates for the PCM or other modules. Sometimes, manufacturers release updates to fix known issues.
• Perform a Hard Reset:
• Disconnect the battery for a few minutes to reset the PCM and clear any temporary glitches. Reconnect and see if the code returns.
• Inspect Other Modules:
• If the issue persists, check other modules in the vehicle that communicate with the PCM. A malfunctioning module can cause communication errors.
• Scan Tool Data:
• Use a professional scan tool to monitor live data from the PCM and other modules. Look for any unusual readings or discrepancies that could indicate a problem.
• Consult Technical Service Bulletins (TSBs):
• Check for any TSBs related to the U1269 code for your specific vehicle make and model. Manufacturers may have specific recommendations for addressing this issue. 1
• Replace the PCM:
• If all other troubleshooting steps fail and the PCM is determined to be faulty, consider replacing it. Ensure that the replacement PCM is compatible with your vehicle. 1
• Professional Diagnosis:
• If you are unable to resolve the issue, consider seeking help from a qualified mechanic or automotive technician who has experience with OBD-II codes and vehicle electronics. By following these steps, you should be able to identify and resolve the underlying issue causing the U1269 code.