Network, generic

U014D Lost Communication With Mirror Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Broken wire in the flexing harness between body and door
Fuse, power or ground of mirror module B missing
Vehicle configuration expects a mirror module that is not fitted (FCA case for module A)
Water ingress or impact damage in the mirror housing

Symptoms

  • 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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–600
Time0.3–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

mirror module bcan bus

Related codes

U0213U044FU0514

References: en.wikipedia.org, static.nhtsa.gov, saabwisonline.com.