U1248 – SCP (J1850) Invalid or Missing Data for Time / Date

The ODBII code U1248 SCP (J1850) indicates that there is invalid or missing data related to the time or date in the vehicle’s communication network.

The severity of ODBII code U1248 is moderate.

Common Causes For: U1247 U1247: “Control Module Communication Loss”

• Faulty or disconnected OBD-II connector
• Malfunctioning PCM (Powertrain Control Module)
• Corrupted or missing data in the vehicle’s computer
• Issues with the vehicle’s battery or electrical system
• Faulty wiring or connectors in the data communication network
• Problems with the vehicle’s clock or timekeeping system
• Software glitches or outdated firmware in the PCM
• Interference from aftermarket devices or modifications

Common misdiagnosis for U1248 SCP (J1850) Invalid or Missing Data for Time / Date

• Faulty PCM (Powertrain Control Module)
• Bad wiring or connectors
• Defective instrument cluster
• Malfunctioning body control module (BCM)
• Incorrectly set or dead battery
• Issues with the OBDII port or scanner
• Software glitches or updates needed
• Faulty sensors related to time/date functions

Common Troubleshooting Steps

When dealing with OBD-II code U1248, which indicates “SCP (J1850) Invalid or Missing Data for Time/Date,” there are several common troubleshooting steps you can take 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. Sometimes, multiple codes can provide more context for the issue.
• Inspect the Battery and Charging System: Ensure that the vehicle’s battery is in good condition and fully charged. A weak battery can cause communication issues.
• Check the alternator and charging system to ensure they are functioning properly.
• Examine the Wiring and Connectors: Inspect the wiring and connectors related to the SCP (J1850) communication network. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors at the PCM (Powertrain Control Module) and any other modules that communicate over the SCP network.
• Check the Ground Connections: Ensure that all ground connections related to the PCM and other modules are clean, tight, and free of corrosion. Poor ground connections can lead to communication issues.
• Test the SCP Communication Network: Use a multimeter or an oscilloscope to check the SCP communication lines for proper voltage and signal integrity.
• Verify that the communication lines are not shorted or open.
• Inspect the PCM: If the wiring and connections are good, the issue may lie within the PCM itself. Check for any signs of damage or failure.
• If possible, reflash or update the PCM software to ensure it is running the latest version.
• Check for Module Communication: Use a scan tool to check if other modules on the SCP network are communicating properly. If other modules are also having communication issues, it may indicate a problem with the network itself.
• Clear the Codes and Test Drive: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner.
• Take the vehicle for a test drive to see if the code reappears. Monitor the vehicle’s performance and any related systems.
• Consult Technical Service Bulletins (TSBs): Check for any TSBs related to the U1248 code for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues that could help in troubleshooting.
• 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 your vehicle’s specific systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the U1248 code.