What Does U1107 Mean?
Similar to U1106, this represents a secondary or alternate channel for legislated diagnostic data that is invalid or missing. Multiple legislated diagnostic communication codes suggest serious PCM network issues or emissions system monitoring failures.
Common Causes
40%
PCM internal processor or communication circuit failure
25%
Corrupted emissions diagnostic data or failed oxygen sensor heater monitoring
20%
Network wiring harness damage affecting diagnostic message transmission
10%
Failed evaporative emissions control module or transmission control module
5%
Instrument cluster or body control module gateway failure
Diagnostic Steps
1
Step 1: Check all OBD-II monitor status; verify which monitors are not running or not reporting results
2
Step 2: Perform PCM self-test using manufacturer-specific diagnostics to check internal module health
3
Step 3: Verify all emissions-related sensors are functioning and reporting to PCM (O2 sensors, EVAP system, etc.)
4
Step 4: Check for voltage drops or intermittent connections in PCM power and ground circuits during operation
5
Step 5: If all inputs are good but communication fails, replace or reprogram PCM after confirming network integrity
Estimated Repair Cost
$150 - $1,600
Parts + labor, varies by vehicle and location
Similar to U1106, this represents a secondary or alternate channel for legislated diagnostic data that is invalid or missing. Multiple legislated diagnostic communication codes suggest serious PCM network issues or emissions system monitoring failures.
The most common cause of U1107 (SCP (J1850) Invalid or Missing Data for Legislated Diagnostics) is: PCM internal processor or communication circuit failure
Typical repair costs for U1107 range from $150 to $1,600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Emissions monitoring is compromised and check engine light may illuminate. Vehicle will likely fail emissions testing but is generally safe to drive.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1107 to identify the root cause.
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Quick Info
Category
Network
System
OBD-II Emissions Diagnostics
Difficulty
Type
Manufacturer
Recommended Tools
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