U0104 Code: Lost Communication With Cruise Control Module

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The U0104 diagnostic trouble code (DTC) indicates that communication with the Cruise Control Module has been lost. The module communicates with the PCM, ABS, BCM, and other control units through the Controller Area Network (CAN) bus. When communication fails, cruise control may become unavailable.

What Does the U0104 Code Mean?

DTC U0104 is stored when the Powertrain Control Module (PCM) or another control module cannot receive messages from the Cruise Control Module within a specified time. The fault is commonly caused by CAN bus wiring problems, poor electrical connections, blown fuses, low battery voltage, or a faulty Cruise Control Module.

Symptoms

  • Check Engine Light illuminated.
  • Cruise control stops working.
  • Cruise control warning light may remain on.
  • Communication errors during diagnostic scanning.
  • Additional communication DTCs may be stored.

Possible Causes

  • Open or short circuit in the CAN bus network.
  • Loose, damaged, or corroded Cruise Control Module connector.
  • Low battery or charging system voltage.
  • Blown fuse supplying the module.
  • Faulty Cruise Control Module.

Can You Drive With U0104?

Driving Severity: Low to Moderate. The vehicle is generally safe to drive, but the cruise control system may be completely disabled until the communication problem is repaired.

Estimated Repair Cost

  • Fuse replacement: $10–40
  • Connector repair: $20–100
  • CAN wiring repair: $80–350
  • Module programming: $100–250
  • Cruise Control Module replacement: $250–900

Basic Diagnostic Steps

  1. Scan all vehicle modules for additional DTCs.
  2. Check battery voltage and charging system operation.
  3. Inspect CAN wiring and Cruise Control Module connectors.
  4. Verify module power and ground circuits.
  5. Repair damaged wiring or replace the module if necessary.

Related DTC Codes

U0104 may occur with U0100, U0101, U0103, and U0105. Reviewing all stored communication codes helps determine whether the issue affects only the Cruise Control Module or the entire CAN network.

Frequently Asked Questions

Can U0104 disable cruise control?

Yes. In most vehicles, cruise control is disabled whenever communication with the Cruise Control Module is lost.

Can a weak battery trigger U0104?

Yes. Low system voltage can interrupt CAN communication and cause this code to be stored.

Should I replace the Cruise Control Module first?

No. Inspect fuses, battery voltage, wiring, connectors, and module power and ground before replacing the module.

Conclusion

U0104 indicates a loss of communication with the Cruise Control Module. Most cases are caused by CAN bus wiring faults, poor electrical connections, or power supply issues rather than a failed module. A complete electrical diagnosis should always be performed before replacing components.

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