Network, generic

U0338 Software Incompatibility With Remote Function Actuation Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The remote function actuation module receives key fob, passive entry and, on newer cars, phone key signals and passes lock, unlock or start requests to the body controller. U0338 means a partner rejects its software. No manufacturer documents U0338 publicly. Jaguar Land Rover shows the typical trap: RFA service parts FK72-19H440 for several Jaguar models from model year 2015 came loaded with software intended for dual-CAN cars, so in these multi-CAN cars the new module stayed silent towards the tester until its fuse was pulled and refitted and the module configured (SSM72557). For Land Rover models from 2010, JLR traces failed RFA downloads to low battery voltage, an interrupted diagnostic link or a corrupted file (SSM71856). U0214 is lost contact, U0515 invalid data. Keyless entry or start may fail.

Likely causes

Replacement module shipped with software for another network layout
Software download aborted by low voltage, a lost link or a corrupted file
Module fitted but not configured or keys not programmed

Symptoms

  • Remote or keyless locking does not respond
  • Keyless start refused or key not detected
  • Module not reachable by the diagnostic tool after replacement

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–800
Time0.3–2 h

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

Parts involved

remote function module

Related codes

U0214U0515

References: static.nhtsa.gov, static.nhtsa.gov.