What Does U1045 Mean?
This is a duplicate indication of missing or invalid traction motor data on the network, same as U1044. Multiple occurrences suggest either multiple modules requesting this data or persistent communication breakdown.
Safety Warning
Hybrid propulsion system may be completely disabled. Vehicle may not start or move, or may operate only on auxiliary power with severely reduced performance.
Common Causes
40%
Complete loss of hybrid motor control module communication
25%
Network bus failure in hybrid system communication lines
20%
Traction motor or inverter hardware failure preventing data generation
10%
Power supply loss to hybrid control modules
5%
Electromagnetic interference affecting shielded communication lines
Diagnostic Steps
1
Step 1: Identify which module is reporting U1045 versus U1044 to determine scope of network issue
2
Step 2: Perform high voltage system isolation safety procedures before testing
3
Step 3: Check 12V auxiliary battery voltage and DC-DC converter operation
4
Step 4: Test continuity and resistance of shielded communication cables in hybrid system
5
Step 5: Monitor network traffic with specialized hybrid system diagnostic equipment
Estimated Repair Cost
$300 - $3,500
Parts + labor, varies by vehicle and location
This is a duplicate indication of missing or invalid traction motor data on the network, same as U1044. Multiple occurrences suggest either multiple modules requesting this data or persistent communication breakdown.
The most common cause of U1045 (SCP (J1850) Invalid or Missing Data for Traction Motor) is: Complete loss of hybrid motor control module communication
Typical repair costs for U1045 range from $300 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Hybrid propulsion system may be completely disabled. Vehicle may not start or move, or may operate only on auxiliary power with severely reduced performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U1045 to identify the root cause.
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Quick Info
Category
Network
System
Network Communication / Hybrid Traction Motor
Difficulty
Type
Manufacturer
Recommended Tools
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