U0305 code meaning
Software Incompatibility With Cruise Control Module
What U0305 means
On current cars the cruise control module is mostly the radar unit of adaptive cruise control, which asks engine and brakes for speed changes to hold a chosen gap. U0305 is stored when another controller finds that this unit carries software or a calibration that does not belong to the vehicle, typically after a radar swap or a partial update. No manufacturer documents U0305 publicly. Land Rover shows the underlying problem: on 2019 Range Rover Sport mild hybrids with the 3.0 L Ingenium six, the CCM could leave the plant with a wrong calibration and had to be reflashed before handover (N343NAS1). CARB names cruise control that switches itself off after a fault as a case of an emissions-neutral reaction, so no MIL is expected. U0104 means lost contact, U0405 invalid data. Cruise and distance functions stay unavailable.
U0305 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0305
- Cruise control and adaptive distance control cannot be switched on
- Driver assistance warning in the cluster, often also collision warning off
- Code appears right after radar replacement, windshield or bumper work
Common causes of U0305
- Most likelyRadar/cruise module replaced or swapped from another car without programming
- PossibleWrong calibration from the factory or after an incomplete software update
- Less likelyEngine, brake or gateway module updated without the cruise module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cruise control moduleControl module software
What each part of U0305 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 05 | The exact fault in that area. |
What to do next
- Note U0305 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0305
What does U0305 mean?
U0305 means "Software Incompatibility With Cruise Control Module". On current cars the cruise control module is mostly the radar unit of adaptive cruise control, which asks engine and brakes for speed changes to hold a chosen gap. It is a generic code, so it means the same on every make.
Is it safe to drive with U0305?
U0305 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0305 fail an emissions test?
U0305 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0305 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U0305 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.