U0189: Lost Communication With Digital Disc Player/Changer Module C
What to do
The car drives entirely normally, and this is one where doing nothing is a reasonable choice — but not the cheapest-looking nothing.
Three disc players means a car from a particular era: a dash unit, a boot changer and a rear-seat system. That equipment is now often unused, and replacement units are usually only available second-hand from another car of the same age.
So there are two sensible answers. Fix it if you use it. Or ask for it to be properly coded out so the car stops expecting the module to be there.
What is not sensible is unplugging it and leaving the fault stored. A car that keeps looking for a module that is not answering may not switch itself fully off after you lock it — and that flattens the battery over three or four days. That is the version that costs money, and it is the reason not to simply ignore this.
If the changer is in the boot, look for water while you are deciding — a hardened rear light seal or an aged tailgate seal puts water right where it lives.
What this code means
A third disc player module has stopped being heard from. See U0187 for why a device nobody uses is still worth attending to.
One numbering note, because this page has no counterpart to point at. The Invalid Data Received family's disc player C sits in the letter-suffixed part of the U048x range rather than at a decimal number, so there is no invalid-data page in this corpus for player C — that family's sequence runs A, B, then D at U0491. This one does have a decimal number. The two ranges simply do not run parallel, and the reasoning at U0488 still applies.
Three disc players effectively dates the vehicle. It means a dash unit, a boot changer and a rear-seat system, or a rear entertainment installation with a player per screen — a configuration that belongs to a particular decade and has not been built since.
Which makes the practical question a different one from the usual. These vehicles are now old enough that the equipment is frequently no longer used, no longer serviceable, and no longer supported — discs scratched, mechanisms seized, replacement units unobtainable except second-hand from another vehicle of the same era. So "repair" is often not the right frame.
The honest options are two, and both are legitimate. Fix it if the equipment is used. Otherwise have it properly coded out, so the vehicle stops expecting it and stops keeping the network awake looking for it. What is not an option is unplugging it and leaving the code stored, because that is the version that flattens batteries.
Likely causes
Start here
- Module not coded to the vehicle · specialist
- Water ingress into module · moderate
- Corroded or loose connector · easy
Less common
- Blown fuse or failed supply · easy
- Another module holding the bus down · specialist
- Damaged data bus wiring · moderate
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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