U0105
Lost Communication With Fuel Injector Control Module
Communication network (fuel injection)
Generic OBD-II
High
What it means
U0105 means another module has lost communication with the fuel injector control module — the unit that drives the injectors on engines that use a separate injector driver. Because it directly affects fueling, this code can cause hard starting, stalling, rough running, or a no-start, and it's usually a power, ground, or wiring problem at the module.
High
Can I keep driving? Often not safely — losing the module that drives the injectors can cause a hard start, rough running, stalling, or a no-start, so limit driving until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on, sometimes with reduced power or limp mode
- Hard starting, no-start, or stalling
- Rough running, misfire, or hesitation
- Fuel injector control module not responding to a scan tool
Common causes
Most likely first
- Loss of power or ground to the fuel injector control moduleLikely
- Blown fuse feeding the moduleCommon
- Damaged, corroded, or loose wiring and connectors to the moduleCommon
- CAN bus wiring fault between the module and the networkLess often
- Failed fuel injector control moduleLess often
How to diagnose & fix
Work through it in order
- Scan all modules and confirm the fuel injector control module is unreachable.
- Check battery voltage and the module's fuses, power, and ground feeds first.
- Inspect the module's connectors and wiring for corrosion, damage, or water intrusion.
- Check the CAN bus wiring between the module and the network for opens or shorts.
- If power, grounds, and bus wiring are good, the module has likely failed — replace and program it as required, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with U0105?+
Not really — because this module controls the injectors, the engine may run poorly, stall, or refuse to start, so drive as little as possible until it's diagnosed.
Can I just clear U0105?+
You can, but it returns unless the power, ground, wiring, or module fault is repaired, and the drivability problem will remain.
Related codes
Often seen with U0105
Read & clear U0105 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX