What Does U1225 Mean?
Duplicate of U1224 indicating continued or additional missing primary identification data on the SCP network. Multiple instances suggest either multiple failing modules or severe bus network corruption.
Common Causes
35%
Multiple modules failing to communicate on the bus simultaneously
30%
Intermittent short circuit on SCP bus network
20%
Power supply issue affecting multiple modules
15%
Failed network termination resistor
Diagnostic Steps
1
Step 1: Verify battery voltage is stable (12.4-12.8V key off, 13.5-14.5V running)
2
Step 2: Check for blown fuses or poor connections in body control power distribution
3
Step 3: Use oscilloscope to examine SCP bus signal quality for distortion or interference
4
Step 4: Test termination resistor value on SCP bus (typically 100-120 ohms)
5
Step 5: Isolate modules systematically by disconnecting to identify source of corruption
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
Duplicate of U1224 indicating continued or additional missing primary identification data on the SCP network. Multiple instances suggest either multiple failing modules or severe bus network corruption.
The most common cause of U1225 (SCP (J1850) Invalid or Missing Data for Primary Id) is: Multiple modules failing to communicate on the bus simultaneously
Typical repair costs for U1225 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple system malfunctions may occur including gauges, lighting, and climate control. Vehicle is generally safe to drive but should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1225 to identify the root cause.
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Quick Info
Category
Network
System
Body Control Network
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
