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DTC codes / U03xx · Software and configuration mismatches / U034F

U034FSoftware Incompatibility With Active Grille Air Shutter Module B

U034F is a network communication fault indicating that a control module (typically the engine control module or body control module) has detected a software incompatibility with the Active Grille Air Shutter Module B. The computer has received data from that module but found the software version, calibration, or configuration does not match what the vehicle expects, so it flags the mismatch and may disable the active grille shutter system.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaSoftware and configuration mismatches

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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