U0305

Software Incompatibility With Cruise Control Module

Q: Can I just clear U0305?

Clearing won't help — the software mismatch is stored in the modules, so the code returns until the correct calibration is programmed.

Communication network Generic OBD-II Low

What it means

U0305 means the cruise control module's software or calibration is incompatible with the vehicle. Only the cruise control (and, on some vehicles, adaptive cruise) is affected — the engine, brakes and transmission drive normally.

Low

Can I keep driving? Yes — the car drives and brakes normally; only the cruise control system is affected until the module software is corrected.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on, often set right after a repair or reprogramming
Cruise control won't engage or drops out
Mismatched software or calibration version reported for the module
The module works partially or not at all after a recent part change

Common causes

Most likely first

The cruise control module was replaced with a unit carrying the wrong or outdated software/calibrationLikely
An interrupted or failed module reprogramming (flash)Common
A replacement module with a part number that doesn't match the vehicle/VINCommon
Corrupted module software after a power drop during an updateLess often
An aftermarket tune or module not matched to the vehicle configurationLess often

How to diagnose & fix

Work through it in order

Scan all modules and compare each module's software/calibration version and part number against the vehicle's build.
If the cruise control module was recently replaced, confirm it is the correct part for the VIN.
Reprogram (reflash) the incompatible module with the correct, up-to-date calibration using a capable scan tool.
Ensure a stable battery/charger during flashing so the update completes cleanly.
If a proper reflash won't take, the module may be faulty or the wrong part — replace with the correct unit, program, and re-test.

FAQ

Quick answers

Is it safe to drive with U0305?+

Yes — the car drives and brakes normally; only the cruise control system is affected until the module software is corrected.

Can I just clear U0305?+

Clearing won't help — the software mismatch is stored in the modules, so the code returns until the correct calibration is programmed.

Read & clear U0305 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX