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U0323 Software Incompatibility With Instrument Panel Control Module

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The instrument panel control module is the cluster with gauges, warning lamps and messages; it also passes data such as units or outside temperature to other modules. U0323 means the engine controller or another unit rejects its software or coding. Mazda (MT-010/18, 2014–2019 models with Mazda Connect) and Toyota for the Scion iA (S-SB-0018-17) list U0323 in the PCM together with U0423 in the ABS and U3000 in the cluster: if the ignition is switched off within 20 s of switching on while the ROOM fuse or the infotainment unit is missing, the codes stick and TPMS and DSC lamps light. Volkswagen's 2014 Golf specification book sets U0323 when the cluster lacks coding for the ambient temperature sensor. Ducati saw U0323 with a lit MIL on Scrambler 800 MY21 after an accessory alarm kit. U0155 is lost contact.

Likely causes

Cluster not coded for the fitted equipment, for example the ambient temperature sensor
Start-up exchange interrupted by a missing fuse, disconnected infotainment unit or quick ignition off
Cluster replaced or updated without matching configuration
Retrofitted accessory such as an alarm kit disturbing the cluster data

Symptoms

  • MIL or several warning lamps such as TPMS and stability control on
  • Codes in engine, ABS and cluster that cannot be cleared
  • Outside temperature or other displays missing

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–500
Time0.3–1.5 h

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

Parts involved

instrument panel modulecontrol module software

Related codes

U0155U0423U0301U0322

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