U0351 code meaning
Software Incompatibility With Active Grille Air Shutter Module D
What U0351 means
Shutter module D is the fourth address the code list reserves for grille flap actuators and is relevant only where a front end has four independently driven flap groups. U0351 signals that the engine controller will not accept the software of that unit. No manufacturer documents U0351 or says where a unit D would sit, so the position is maker-specific. What is documented around it: Hyundai already splits the lower flaps of the 2026 Palisade into left and right actuators and stores codes for modules B and C when water reaches their plugs (26-01-026H), GM swaps shutters whose firmware misreports instead of reflashing them (PIT6133), and CARB requires the active time of such off-cycle features to be logged. Part number and software level of the fitted actuator should be checked first. U028C is lost contact, U058D invalid data.
U0351 at a glance
- Check engine lightUsually not
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0351
- One flap group no longer opens or closes
- Air flap warning or check engine lamp depending on the maker
- No noticeable change in driving
Common causes of U0351
- Most likelyFlap actuator of group D with another part number or firmware fitted
- PossibleFront end or bumper from another version fitted with different shutter equipment
- Less likelyEngine controller calibration expects a different number of shutter modules
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Active grille shutter module d
What each part of U0351 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 51 | The exact fault in that area. |
What to do next
- Note U0351 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 U0351
What does U0351 mean?
U0351 means "Software Incompatibility With Active Grille Air Shutter Module D". Shutter module D is the fourth address the code list reserves for grille flap actuators and is relevant only where a front end has four independently driven flap groups. It is a generic code, so it means the same on every make.
Is it safe to drive with U0351?
U0351 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0351 fail an emissions test?
Yes, it can. U0351 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U0351 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U0351 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.