U0134 Code – Lost Communication With Ride Level Control Module

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Fault Code Description

The U0134 Diagnostic Trouble Code (DTC) indicates that one or more control modules have lost communication with the Ride Level Control Module over the Controller Area Network (CAN) bus. This module manages the vehicle's automatic ride height or air suspension system. When communication is interrupted, the suspension system may be disabled or operate in a fail-safe mode, causing the U0134 code to be stored.

Symptoms

  • Check Engine Light or suspension warning light illuminated.
  • Ride Height Control or Air Suspension warning message.
  • Vehicle sits too high or too low.
  • Automatic leveling system stops working.
  • Harsh ride quality or uneven suspension height.
  • Additional CAN communication DTCs may be stored.

Common Causes

  • Open or short circuit in CAN High or CAN Low wiring.
  • Blown fuse supplying the Ride Level Control Module.
  • Poor battery voltage, power supply, or ground connection.
  • Loose, damaged, or corroded electrical connectors.
  • Faulty Ride Level Control Module.
  • Incorrect module programming after replacement.

Severity

Severity: Moderate to High. The vehicle may remain drivable, but the automatic ride height system may be disabled, resulting in poor ride quality, reduced stability, and uneven vehicle height. Prompt diagnosis is recommended.

Average Repair Cost

  • CAN bus wiring repair: $100–$350
  • Power or ground circuit repair: $80–$250
  • Connector cleaning or replacement: $50–$200
  • Fuse replacement: $10–$50
  • Ride Level Control Module programming: $100–$300
  • Ride Level Control Module replacement: $500–$1,500+

Diagnosis

  1. Scan all control modules for stored DTCs.
  2. Inspect the Ride Level Control Module fuse.
  3. Verify battery voltage, power, and ground circuits.
  4. Inspect CAN High and CAN Low wiring.
  5. Check connectors for corrosion or loose terminals.
  6. Verify module communication using a professional scan tool.
  7. Reprogram or replace the Ride Level Control Module if necessary.

Common Repairs

  • Repair damaged CAN bus wiring.
  • Replace blown fuses.
  • Repair power or ground circuits.
  • Clean or replace damaged electrical connectors.
  • Reprogram the Ride Level Control Module.
  • Replace the Ride Level Control Module if confirmed faulty.

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