What Does U1099 Mean?
Similar to U1098, this code indicates the control module is not receiving valid speed control data over the network. This is a duplicate or related speed control communication fault affecting cruise control operation.
Common Causes
35%
Failed speed control amplifier or servo not communicating on network
25%
Open or shorted network bus wiring affecting speed control data
20%
PCM internal communication circuit failure
13%
Water intrusion or corrosion in speed control module connector
7%
Faulty vehicle speed sensor signal affecting network data
Diagnostic Steps
1
Step 1: Verify cruise control functionality and check for related speed control codes in all modules
2
Step 2: Monitor network bus activity with bi-directional scan tool or oscilloscope for proper signal patterns
3
Step 3: Inspect speed control components for physical damage, especially wiring near the servo location
4
Step 4: Test resistance on SCP bus circuits (should be 100-120 ohms end-to-end with modules disconnected)
5
Step 5: Compare vehicle speed data across multiple modules to verify consistent speed signal throughout network
Estimated Repair Cost
$120 - $850
Parts + labor, varies by vehicle and location
Similar to U1098, this code indicates the control module is not receiving valid speed control data over the network. This is a duplicate or related speed control communication fault affecting cruise control operation.
The most common cause of U1099 (SCP (J1850) Invalid or Missing Data for Vehicle Speed Control) is: Failed speed control amplifier or servo not communicating on network
Typical repair costs for U1099 range from $120 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control system will be inoperative. Vehicle is safe to drive but requires manual speed control by the driver.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1099 to identify the root cause.
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Quick Info
Category
Network
System
Speed Control/Cruise Control System
Difficulty
Type
Manufacturer
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