What Does U1133 Mean?
This code is a duplicate or secondary identifier for invalid or missing vehicle motion data on the SCP network. It often appears simultaneously with U1132 or indicates a different module detecting the same network communication failure.
Common Causes
35%
ABS control module communication failure
25%
SCP network bus short or open circuit
20%
Instrument cluster module not receiving speed data
15%
Wheel speed sensor circuit malfunction
5%
Network termination resistor failure
Diagnostic Steps
1
Step 1: Verify which control module set this code versus U1132 to identify the affected system
2
Step 2: Perform network integrity test measuring resistance between SCP bus and ground (should be 100-120 ohms)
3
Step 3: Monitor SCP bus voltage with oscilloscope for proper square wave patterns during operation
4
Step 4: Check instrument cluster and body control module for independent speed signal reception
5
Step 5: Inspect all network module connectors for bent pins, corrosion, or water intrusion
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
This code is a duplicate or secondary identifier for invalid or missing vehicle motion data on the SCP network. It often appears simultaneously with U1132 or indicates a different module detecting the same network communication failure.
The most common cause of U1133 (SCP (J1850) Invalid or Missing Data for Vehicle Motion) is: ABS control module communication failure
Typical repair costs for U1133 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Similar to U1132, this affects speedometer accuracy, cruise control operation, and potentially ABS functionality. Multiple systems may behave erratically.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1133 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication / Vehicle Speed Sensing
Difficulty
Type
Manufacturer
Recommended Tools
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