U042D code meaning
Invalid Data Received From Active Vibration Control Module
What U042D means
The active vibration control module drives active engine mounts or inertial actuators that push against engine vibration in counter-phase, useful with cylinder deactivation. It needs engine speed and other data from the bus and reports its own status back. U042D says a partner receives its frames but finds them invalid. No manufacturer documents U042D publicly. Honda's patent US 10,360,893 describes such a controller that adapts its cancelling output by adaptive filtering and also reads vehicle speed, blower air volume and window state. Bentley shows it is a separate box: fitting newer mounts on a 2017-2020 Bentayga calls for a new program or a new controller for the active mounts, since the old software does not suit them (2055760/1). U012C is lost contact. Expect more vibration; no MIL.
U042D at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U042D
- Noticeable vibration or humming at idle
- More body vibration when cylinders are deactivated
Common causes of U042D
- PossibleControl unit software not matching replaced mounts or actuators
- PossibleActive vibration control module faulty
- Less likelyLow supply voltage or poor connection at the module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Active vibration module
What each part of U042D means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2D | The exact fault in that area. |
What to do next
- Note U042D 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 U042D
What does U042D mean?
U042D means "Invalid Data Received From Active Vibration Control Module". The active vibration control module drives active engine mounts or inertial actuators that push against engine vibration in counter-phase, useful with cylinder deactivation. It is a generic code, so it means the same on every make.
Is it safe to drive with U042D?
U042D does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U042D fail an emissions test?
U042D 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 U042D to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U042D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.