U1076: Invalid Data on SCP Bus
The U1076 code indicates that a control module on the SCP (Standard Corporate Protocol) network has detected invalid or missing data for a specific Primary ID. This means a transmitting module is not sending its required periodic message, or the received data fails integrity checks (checksum/CRC), preventing shared functions from synchronizing between modules.
1. Commonly Affected Makes
2. Most Common Causes
- Failed or disconnected transmitting module
- Open or short circuit in the SCP bus (+/-) to the transmitting module
- Internal failure of the receiving module that stores the code
- Data corruption due to electromagnetic interference (EMI) in the wiring harness
- Low battery voltage affecting bus transmission
3. Symptoms You Will Notice
- Illuminated Check Engine Light
- Malfunction of systems that rely on the missing data (e.g., transmission shifting, ABS, instrument cluster)
4. Step-by-Step Diagnosis
Scan all modules for related codes and check network communication
Inspect the SCP bus wiring for opens, shorts, or damage
Verify battery voltage is within spec (12.6V+ engine off)
Test the transmitting module's power, ground, and bus signals
If no wiring issues, suspect the transmitting or receiving module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, but you may experience drivability issues or loss of some features. Have it diagnosed soon to prevent further problems.
How much does it cost to fix?▼
Diagnosis typically $100-$150. Repair costs vary: wiring repair $100-$300, module replacement $200-$800+ depending on the module.