OBD-II Standard OBD-II Universal Error Code U0334

OBD-II Standard OBD-II Major Seat

Model: OBD-II Universal | Code: U0334

Applicable Systems
OBD-II

Symptoms

Power seat functions may not work. Memory seat positions may be lost. DTC U0334 is stored by a control module that lost communication with the Seat module.

Possible Causes

  • CAN bus wiring under seat damaged
  • Seat module power supply fault
  • Seat module internal failure
  • Connector under seat corroded

Troubleshooting Steps

  1. Step 1: Connect a diagnostic scanner and read all module DTCs to confirm U0334
    DTC U0334 is present; note which module logged the code
  2. Step 2: Check CAN bus wiring between the affected modules for continuity, shorts, and termination resistor values
    CAN high and low lines intact, 60 ohms across the bus
  3. Step 3: Verify power and ground supplies to the affected module
    Battery voltage at module power pin, less than 0.1V drop on ground side
  4. Step 4: If wiring is intact, the affected module may need replacement and programming
    Communication restored after module replacement and programming

How to Reset

Clear the DTC after repair using a diagnostic scanner. The code will clear automatically if communication is restored and no fault is detected for 3 consecutive drive cycles.

Common Replacement Parts

  • varies: Seat control module (if confirmed faulty) (Confirm part number via VIN before ordering; programming typically required)

Frequently Asked Questions

  • Q: What does code U0334 mean?

    This is a network communication DTC indicating lost communication with the Seat module. The CAN bus wiring, module power supply, and the module itself should be checked.

  • Q: Can I drive with code U0334?

    Driving may be possible but the affected system may not function. If the code relates to ECM, transmission, or brake communication, have it diagnosed promptly for safety.

Related OBD-II Standard Fault Codes

Source: SAE J2012 Standard OBD-II Diagnostic Trouble Codes

Category: OBD-II