What Does U1104 Mean?
The control module is not receiving valid data from another module regarding chassis status information over the SCP (Standard Corporate Protocol) J1850 network. This indicates a communication breakdown between modules sharing vehicle chassis-related information.
Common Causes
35%
Faulty ABS module or Anti-Lock Brake System controller failing to transmit data
30%
Damaged or corroded wiring in the SCP communication bus between modules
20%
Failed body control module or chassis control module
10%
Low battery voltage or poor power supply to network modules
5%
Module software corruption or outdated calibration files
Diagnostic Steps
1
Step 1: Check battery voltage and ensure it's above 12.4V; verify all module ground connections are clean and tight
2
Step 2: Using a scan tool, monitor live network traffic to identify which module is not transmitting chassis status data
3
Step 3: Inspect SCP bus wiring harness for damage, shorts, or open circuits; check resistance between bus terminals (should be approximately 100-120 ohms)
4
Step 4: Check for other DTCs in ABS, BCM, and related chassis control modules to pinpoint the failing component
5
Step 5: If wiring and power are good, test suspect module by substitution or reflash module software if available
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The control module is not receiving valid data from another module regarding chassis status information over the SCP (Standard Corporate Protocol) J1850 network. This indicates a communication breakdown between modules sharing vehicle chassis-related information.
The most common cause of U1104 (SCP (J1850) Invalid or Missing Data for Chassis Status Request) is: Faulty ABS module or Anti-Lock Brake System controller failing to transmit data
Typical repair costs for U1104 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May affect proper operation of ABS, traction control, or stability systems. Vehicle may be drivable but safety systems could be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1104 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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