U3000: Control Module (network or internal fault)
Severity: medium
What it means: A control module (one of the car's computers) has found a problem with itself, its software, or its communication on the CAN network (the wiring the modules use to talk to each other). The letters and numbers after the code, such as U3000-04, tell a technician more. Which module set it matters, so read it with a scan tool that shows the module.
Safe to drive? Depends on which module set it. If a warning such as 'Suspension fault' comes with it, drive gently and get it checked soon.
Common symptoms
- A warning message from the system the module controls (for example a suspension fault)
- Other network (U) codes stored at the same time
- Features working on and off
Likely causes, ranked
- Module software or configurationShop
- Low or unstable battery voltageDIY
- Wiring or connector problem on the networkShop
- Failed control moduleShop
Vehicle-specific notes
- 2017 Land Rover Discovery: Land Rover service message SSM73441 says 2017 Discovery, Range Rover and Range Rover Sport can show an intermittent 'Suspension fault' or 'Adaptive dynamics fault' with U3000-04 stored in the chassis control module; the fix is a software reconfiguration. Read the full answer · Source
What it means: A control module (one of the car's computers) has found a problem with itself, its software, or its communication on the CAN network (the wiring the modules use to talk to each other). The letters and numbers after the code, such as U3000-04, tell a technician more. Which module set it matters, so read it with a scan tool that shows the module.
Severity: Medium. Safe to drive? Depends on which module set it. If a warning such as 'Suspension fault' comes with it, drive gently and get it checked soon.
DIY or shop?
Checking and charging the battery is DIY. Reading module codes, software updates and network testing need a dealer-level scan tool.
Before you replace parts
- Read all stored codes from every module, and note which module stored U3000 and the suffix after it.
- Check the 12V battery and charging voltage first; low voltage causes many network codes.
- Check your VIN for recalls, service messages and software updates.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. If the module controls brakes, steering or suspension, get it checked before long trips. A code points to a circuit or system, not always a specific part.