What Does U1123 Mean?
Second odometer data communication error indicating persistent failure of odometer information transmission. Combined with U1122, this confirms widespread odometer data unavailability on the network.
Common Causes
45%
Complete instrument cluster failure or internal circuit board damage
25%
Loss of power or ground to instrument cluster
20%
Network bus failure specific to cluster circuit preventing any cluster communication
10%
Recent cluster replacement without proper programming or VIN/odometer transfer
Diagnostic Steps
1
Step 1: Check instrument cluster operation; verify gauges, warning lights, and display are functioning
2
Step 2: Test for battery voltage at cluster power supply pins and verify solid ground connection
3
Step 3: Check continuity of SCP bus wires from cluster connector to other network modules
4
Step 4: Attempt to communicate directly with cluster using factory scan tool bidirectional controls
5
Step 5: If cluster is new/replaced, verify proper programming and odometer/VIN initialization completed
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
Second odometer data communication error indicating persistent failure of odometer information transmission. Combined with U1122, this confirms widespread odometer data unavailability on the network.
The most common cause of U1123 (SCP (J1850) Invalid or Missing Data for Odometer) is: Complete instrument cluster failure or internal circuit board damage
Typical repair costs for U1123 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but odometer recording may be interrupted. Affects service intervals, warranty tracking, and resale documentation. Should be repaired to maintain accurate vehicle records.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1123 to identify the root cause.
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Quick Info
Category
Network
System
Instrument Cluster / Vehicle Communication Network
Difficulty
Type
Manufacturer
Recommended Tools
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