U014D code meaning
Lost Communication With Mirror Control Module B
What U014D means
U014D concerns the second networked mirror unit. Modern mirrors carry motors for adjustment and folding, a heating element, auto-dimming glass, turn-signal repeaters or blind-spot lamps, and the electronics for them often sit on the bus as their own node. J2012 provides two such units, and the receiver, usually the body or door controller, stores U014D when unit B stops replying. No manufacturer documents U014D publicly. FCA assigns the A slot, U0213, to the interior mirror: in STAR case S2108000013 the body controller logged it after a configuration restore wrongly marked a combined rear-view mirror unit as fitted, without any customer effect. Which mirror B is therefore depends on the make, often an outside mirror. Expect that mirror's adjustment, folding or heating to fail; no MIL. U044F is invalid data from B.
U014D at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U014D
- Mirror adjustment, folding or heating inoperative on one side
- Blind-spot or turn-signal lamp in the mirror dark
- Often no other effect; code found during a scan
Common causes of U014D
- Most likelyBroken wire in the flexing harness between body and door
- PossibleFuse, power or ground of mirror module B missing
- PossibleVehicle configuration expects a mirror module that is not fitted (FCA case for module A)
- Less likelyWater ingress or impact damage in the mirror housing
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Mirror module bCAN bus
What each part of U014D means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4D | The exact fault in that area. |
What to do next
- Note U014D 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 U014D
What does U014D mean?
U014D means "Lost Communication With Mirror Control Module B". U014D concerns the second networked mirror unit. It is a generic code, so it means the same on every make.
Is it safe to drive with U014D?
U014D does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U014D fail an emissions test?
U014D 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 U014D to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U014D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.