U1207 SCP Bus Communication Fault
The U1207 code indicates that a control module (typically the PCM, IC, or GEM) has detected a loss of communication or invalid/corrupt data from a specific Primary ID on the SCP (Standard Corporate Protocol) bus, which is Ford's implementation of the SAE J1850 VPW standard. This means an expected network node is not transmitting, is sending out-of-range data, or bus interference is corrupting messages for that ID.
1. Commonly Affected Makes
2. Most Common Causes
- icon icon-cause">🔧Faulty or unpowered/ungrounded transmitting module (e.g., PCM, ABS, IC, GEM)
- Open or short circuit in the SCP bus wiring (J1850 VPW +/-)
- Damaged or missing bus termination resistors
- Excessive electromagnetic interference (EMI) in the harness
- Defective SCP transceiver hardware in the receiving module
- Outdated or corrupted module software
3. Symptoms You Will Notice
- Check Engine Light or other warning lights illuminated
- Erratic operation of gauges, lights, or accessories
- Module-specific functions inoperative (e.g., ABS, airbag, instrument cluster)
4. Step-by-Step Diagnosis
Scan all modules for related communication codes and note which modules are missing
Inspect the SCP bus wiring for damage, corrosion, or poor connections
Measure bus termination resistance (should be ~60 ohms with two 120-ohm resistors)
Check for voltage and ground at each module on the bus
Perform a network test to isolate the non-communicating module
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may still be drivable, but some systems (like ABS, airbags, or instrument cluster) may not function properly. It is recommended to diagnose and repair promptly to avoid safety risks.
How much does it cost to fix?▼
Diagnosis typically costs $100-$200. Repairs range from $50 for a wiring fix to $500+ for module replacement or reprogramming.