What Does U0134 Mean?
Communication has been lost between the control modules and the Rear Power Steering Control Module. This affects vehicles equipped with rear-wheel or four-wheel steering systems that provide enhanced maneuverability.
Common Causes
35%
Rear Power Steering Control Module failure or internal circuit fault
30%
Corroded or damaged wiring harness and connectors
20%
CAN bus circuit fault or short to ground/power
10%
Inadequate power supply or blown fuse to module
5%
Module ground circuit open or high resistance
Diagnostic Steps
1
Step 1: Check fuses and power supply voltage to Rear Power Steering Control Module
2
Step 2: Inspect module connectors for water intrusion, corrosion, or damage
3
Step 3: Measure CAN bus voltages at module connector (should be approximately 2.5V reference)
4
Step 4: Test CAN High and CAN Low circuit continuity and proper resistance (approximately 60 ohms between lines)
5
Step 5: Substitute known-good module if available to isolate module vs. circuit fault
Estimated Repair Cost
$250 - $1,800
Parts + labor, varies by vehicle and location
Communication has been lost between the control modules and the Rear Power Steering Control Module. This affects vehicles equipped with rear-wheel or four-wheel steering systems that provide enhanced maneuverability.
The most common cause of U0134 (Lost Communication With Power Steering Control Module Rear) is: Rear Power Steering Control Module failure or internal circuit fault
Typical repair costs for U0134 range from $250 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Rear steering function will be disabled, reducing vehicle maneuverability at low speeds. Vehicle remains safe to drive but handling characteristics will differ from normal operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0134 to identify the root cause.
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Quick Info
Category
Network
System
Rear/Four-Wheel Steering System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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