U0189

Universal

Lost Communication With Digital Disc Player/Changer Module C

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The vehicle has detected that it cannot communicate with digital disc player/changer module C over its communication network. This module supports disc playback or related media functions where fitted. The media system may not work as expected, but the code does not by itself prove the module has failed; a power, ground, wiring, connector, or network issue could also interrupt communication. Some vehicles may show no noticeable symptoms.

Report an error with this code

⚠️ Before You Begin (Safety First)

This is generally not a reason to stop driving if the vehicle otherwise operates normally. Do not troubleshoot or handle wiring while driving. If the fault affects a display or feature you rely on for safe driving, such as a reversing camera, use extra caution and have it checked.

Common Symptoms

  • Disc playback or changer functions may be unavailable if the affected module supports those features.
  • The infotainment system may display a message or fail to show information from the module.
  • Other entertainment features may be unaffected if they use different equipment or communication paths.
  • There may be no noticeable symptoms, especially if the vehicle is not equipped with or does not use the affected feature.

Common Causes

  • The module may have lost power or ground because of a fuse, connection, or wiring problem.
  • A loose, damaged, or corroded connector or wire may interrupt communication.
  • A problem elsewhere on the vehicle communication network may prevent the module from responding.
  • The module itself may have an internal fault, but the code alone does not confirm this.
  • Aftermarket equipment or a recent electrical or infotainment repair may have affected connections or network communication.

Diagnostic Steps

  1. Note which media features are affected and whether the problem is constant or intermittent; this helps narrow down whether the issue is limited to disc functions or broader infotainment communication.
  2. With the vehicle parked, check the owner's manual for infotainment messages or basic reset guidance; avoid disconnecting the battery unless the vehicle-specific instructions call for it.
  3. Check the relevant fuses listed in the owner's manual, if accessible, and replace a blown fuse only with the specified type and rating. If it blows again, seek diagnosis rather than repeatedly replacing it.
  4. If the module has an easily accessible connector and the manual permits inspection, check for an obviously loose connection or visible damage with the vehicle switched off. Do not force trim or disturb wiring you cannot safely access.
  5. Have the vehicle scanned for communication codes in other modules as well; related codes can help identify whether the problem is isolated or affects the wider network.

When to Call a Professional

A technician can check which modules are communicating, review related network fault codes, and verify the module's power, ground, connectors, and network wiring using vehicle-specific service information. Confirming these basics helps distinguish a communication-path problem from a module fault before replacing parts.

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Commonly Asked Questions

Does U0189 prove that the disc player or changer module needs replacement?

No. It indicates lost communication with the module. Power, ground, connectors, wiring, or another network issue should be checked before concluding the module has failed.

Can I keep driving with this code?

Usually, if the vehicle otherwise operates normally. Avoid diagnosing the issue while driving, and use caution if an affected display or feature is important for safe operation.

Why might there be no obvious symptoms?

The affected media feature may not be in use or equipped, or the communication loss may not disrupt other vehicle functions.

What does scanning other modules add?

Other communication codes can show whether the issue is limited to module C or part of a wider network or power problem.

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