What Does U1229 Mean?
Duplicate of U1228 indicating continued or additional missing tire data on the SCP network. Multiple instances may indicate complete TPMS system failure or severe communication breakdown.
Common Causes
40%
Complete TPMS receiver module failure
25%
All TPMS sensors have dead batteries or have failed
20%
Antenna or RF receiver circuit failure in TPMS module
15%
SCP bus network isolation preventing TPMS data transmission
Diagnostic Steps
1
Step 1: Attempt TPMS system reset or relearn procedure per manufacturer specifications
2
Step 2: Use TPMS diagnostic tool to check sensor IDs and signal strength from each wheel
3
Step 3: Test TPMS receiver module connector pins for voltage, ground, and SCP bus signals
4
Step 4: Check for aftermarket wheels or tires that may have damaged sensors during installation
5
Step 5: Replace TPMS receiver module and reprogram if no sensor signals are being received
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
Duplicate of U1228 indicating continued or additional missing tire data on the SCP network. Multiple instances may indicate complete TPMS system failure or severe communication breakdown.
The most common cause of U1229 (SCP (J1850) Invalid or Missing Data for Tires) is: Complete TPMS receiver module failure
Typical repair costs for U1229 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Complete loss of tire pressure monitoring increases risk of driving on underinflated tires. Check tire pressures manually before each trip until system is repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1229 to identify the root cause.
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Quick Info
Category
Network
System
Tire Pressure Monitoring System
Difficulty
Type
Manufacturer
Recommended Tools
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