U1007 SCP Bus Communication Failure
The U1007 code indicates that a control module on the SCP (Standard Corporate Protocol) network, based on SAE J1850 VPW, has detected invalid data or a complete absence of expected messages for a specific Primary ID. This means that the periodic communication from a particular node on the bus has failed or is corrupted, preventing the receiving module from obtaining vital parameters needed for its control strategy.
1. Commonly Affected Makes
2. Most Common Causes
- icon icon-cause">🔧Failed or unpowered module responsible for the Primary ID
- Open or short circuit in the SCP bus wires (SCP+ / SCP-)
- Damaged, corroded, or loose connector at the receiving or transmitting module
- Excessive electromagnetic interference (EMI) corrupting data frames
3. Symptoms You Will Notice
- Check Engine Light or other warning lights illuminated
- Erratic behavior or loss of function in affected systems (e.g., transmission, ABS, instrument cluster)
4. Step-by-Step Diagnosis
Scan all modules for related communication codes and note which Primary ID is missing
Inspect the SCP bus wiring for opens, shorts, or corrosion, especially at connectors
Check power and ground at the module that should be transmitting the missing Primary ID
Use an oscilloscope to verify proper bus voltage and signal patterns on SCP+ and SCP-
If wiring and power are good, suspect a faulty module and perform a swap test if possible
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may still be drivable, but you could experience reduced functionality or drivability issues. It's best to diagnose and repair promptly to avoid further problems.
How much does it cost to fix?▼
Repair costs vary widely depending on the cause. A simple wiring repair might cost $100-$200, while replacing a module can range from $300 to $800 or more, including labor.