U0187 Lost Communication With Digital Disc Player/Changer Module "A"
U0187 is a generic OBD2 network code. It means “Lost Communication With Digital Disc Player/Changer Module "A"” — the same on every make and model, because the definition comes from the SAE J2012 standard rather than from the carmaker.
Ask the AI about U0187 on your car- System
- Network (U)
- Code type
- Generic (SAE)
- Range
- U01xx
What the wording tells you
“Lost communication” means the module that stored the code stopped receiving messages from the module named in it. That named module is the one to look at — its fuse, power and ground, its connector and the network wiring to it — along with the battery, since a weak one can make several modules drop off at once.
“A”: where a car has several identical components, SAE tells them apart with letters. Which physical part is “A” is defined by the manufacturer — check the service information for your car before replacing it.
Can I keep driving with U0187?
The rule of thumb for this area (lost communication between modules): It depends on which module is missing: the engine, transmission, ABS or airbag module — have it checked straight away; comfort modules can wait. A weak battery can set many of these codes at once, so check it first.
How U0187 breaks down
Network. Communication between the car’s control modules.
Generic code: defined by SAE, the same on every make.
Lost communication between modules.
The specific fault within this range.
Where to look: Lost communication between modules
Codes stored when one module stops receiving messages from another — the engine or transmission computer, ABS, airbags, body control, instrument cluster or dozens of others. The code names the module that went silent, not the one that stored it.
Typical causes in this area
- Low battery voltage or a poor battery connection
- A blown fuse or failed relay feeding the silent module
- Damaged network wiring or a corroded connector
- A failed module
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Frequently asked
What does U0187 mean?
U0187 is a generic OBD2 network code. It means “Lost Communication With Digital Disc Player/Changer Module "A"” — the same on every make and model, because the definition comes from the SAE J2012 standard rather than from the carmaker.
Can I drive with U0187?
The rule of thumb for this area (lost communication between modules): It depends on which module is missing: the engine, transmission, ABS or airbag module — have it checked straight away; comfort modules can wait. A weak battery can set many of these codes at once, so check it first.
What causes U0187?
“Lost communication” means the module that stored the code stopped receiving messages from the module named in it. That named module is the one to look at — its fuse, power and ground, its connector and the network wiring to it — along with the battery, since a weak one can make several modules drop off at once. Typical causes in this area: Low battery voltage or a poor battery connection; A blown fuse or failed relay feeding the silent module; Damaged network wiring or a corroded connector; A failed module.
How do I clear U0187?
Fix the cause first, then clear it with any OBD2 scanner or app. Once the fault is gone the car also clears it on its own: the check engine lamp goes off after the self-test passes on three drive cycles in a row, and the stored code ages out after about 40 warm-ups. Clearing without a repair only hides it for a while — and resets the readiness monitors an emissions inspection looks at.
Is U0187 the same on every car?
Yes. U0187 is a generic SAE J2012 code, so its definition is identical on every make and model. What differs is the cause behind it and the repair procedure, which depend on the engine — that’s why the assistant on this page asks for your car.
Guides
Definitions: the generic SAE J2012 codes from Brimly’s offline dictionary (data version 2026.09). Causes and advice are general guidance for all makes — the service information for your car has the last word.