U0105 Lost Communication With Fuel Injector Control Module
U0105 is a generic OBD2 network code. It means “Lost Communication With Fuel Injector Control Module” — 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 U0105 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.
Can I keep driving with U0105?
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 U0105 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
Ask the AI about U0105 on your car
Pick your car and ask — the assistant takes your make, model and engine into account. Ten questions a day, free, no sign-up.
The assistant is answering…
That's 10 for today
The free web limit resets tomorrow. In the Brimly app the assistant knows your specific car — its real mileage, fuel log, and service history.
Requires iOS 18.1 or later. Free to download, with optional in-app purchases.
The conversation is stored only in your browser — we don't keep it on our servers.
Read and clear U0105 on your iPhone
Brimly reads stored, pending and permanent codes through a Bluetooth LE or Wi-Fi OBD2 adapter, explains each one offline from the same 2,693-code dictionary as this page, and clears them once the fault is fixed — each clear goes into the car’s service history with the codes it removed. OBD diagnostics are part of Brimly Forever, a one-time purchase; the PRO assistant explains a code for your exact car.
Requires iOS 18.1 or later. Free to download, with optional in-app purchases.
Frequently asked
What does U0105 mean?
U0105 is a generic OBD2 network code. It means “Lost Communication With Fuel Injector Control Module” — 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 U0105?
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 U0105?
“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 U0105?
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 U0105 the same on every car?
Yes. U0105 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.