U1182 – SCP (J1850) Invalid or Missing Data for Primary Id

The ODBII code U1182 indicates that there is invalid or missing data for the primary identifier in the SCP (Service Communication Protocol) using the J1850 communication standard, which may affect communication between modules in the vehicle.

The severity of ODBII code U1182 is moderate.

Common Causes For: U1181 SCP (J1850) Invalid or Missing Data for Personalization (Memory) Features

• Faulty or damaged wiring/connectors
• Malfunctioning control modules
• Poor ground connections
• Communication network issues
• Corrupted data signals
• Incompatible or faulty aftermarket devices
• Software glitches in the vehicle’s systems
• Low battery voltage or power supply issues

Common misdiagnosis for U1182 SCP (J1850) Invalid or Missing Data for Primary Id

• Faulty OBDII connector
• Bad ground connections
• Malfunctioning PCM (Powertrain Control Module)
• Corrupted data from other modules
• Wiring issues or shorts in the communication lines
• Faulty or incompatible aftermarket devices
• Software glitches or outdated firmware in the vehicle’s modules

Common Troubleshooting Steps

The OBD-II code U1182 indicates that there is an issue with the communication on the SCP (Serial Communication Protocol) bus, specifically related to the J1850 protocol. This code typically means that the vehicle’s onboard computer is not receiving valid data from a module that it expects to communicate with. Here are some common troubleshooting steps to diagnose and resolve the issue:

• Check for Other Codes: Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing other codes may resolve the U1182 code.
• Inspect Wiring and Connectors: Visually inspect the wiring and connectors related to the modules on the SCP bus. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the connectors for the modules that are known to communicate over the J1850 protocol.
• Check Battery Voltage: Ensure that the vehicle’s battery is fully charged and that the voltage is within the normal range (typically 12.4 to 12.6 volts when the engine is off).
• Check for any voltage drops or poor ground connections that could affect communication.
• Test the Modules: Identify the modules that communicate over the J1850 protocol (e.g., PCM, BCM, etc.) and test them for proper operation.
• If possible, use a scan tool to check if the modules are responding correctly.
• Perform a Network Test: Use a professional scan tool to perform a network test. This can help identify which module is not communicating properly.
• Some scan tools can also display live data from the modules, which can help pinpoint the issue.
• Check for Short Circuits or Open Circuits: Use a multimeter to check for short circuits or open circuits in the wiring harnesses associated with the SCP bus.
• Look for any signs of wear or damage that could cause communication issues.
• Inspect for Interference: Check for any aftermarket devices or modifications that may interfere with the SCP communication, such as alarms, remote starters, or audio systems.
• Clear 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 returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific troubleshooting procedures related to the SCP bus and J1850 communication.
• Seek Professional Help: If the issue persists after performing the above steps, consider seeking help from a qualified automotive technician or dealership. They may have access to specialized diagnostic tools and resources. By following these steps, you should be able to identify and resolve the issue causing the U1182 code.