Network, generic

U0327 Software Incompatibility With Vehicle Security Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The vehicle security control module handles theft protection: alarm, monitoring of doors, bonnet and tailgate and, at some makers, the key check that unlocks the engine. Chrysler, for example, gives this job to its wireless control module, and its lost-contact code U0168 calls that unit the vehicle security control module (18-023-13). U0327 means another controller finds the software of this module unsuitable, typically after a replacement, a used part or an update of only one side. No manufacturer documents U0327 publicly. Where the security module also performs the key check, the engine controller withholds release and the car will not start; elsewhere the alarm, remote locking or panic function misbehaves. U0326 covers a separate immobilizer module, U0168 lost contact and U0427 invalid data. No MIL is expected.

Likely causes

Security or wireless control module replaced without programming and key learning
Engine or body controller updated while the security module kept old software
Aftermarket alarm or remote start interfering with the security data

Symptoms

  • No start or start refused although the key is accepted at the door
  • Alarm triggers without reason or cannot be armed
  • Security lamp flashing, remote locking unreliable

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€80–700
Time0.5–2 h

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

Parts involved

vehicle security modulecontrol module software

Related codes

U0168U0427U0326

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