What does code U034B mean?

Q: What does code U034B mean?

Software Incompatibility With Brake Booster Control. U034B is a network communication fault indicating that a control module, typically the antilock brake system (ABS) or body control module, has received software or calibration data from the brake booster control module that it cannot interpret or that is incompatible with its own programming. The computer detected a mismatch in software version, calibration identifier, or message format between the brake booster control module and the module requesting the data, so it flagged the incompatibility rather than a hardware failure.

DTC codes / U03xx · Software and configuration mismatches / U034B

U034BSoftware Incompatibility With Brake Booster Control

U034B is a network communication fault indicating that a control module, typically the antilock brake system (ABS) or body control module, has received software or calibration data from the brake booster control module that it cannot interpret or that is incompatible with its own programming. The computer detected a mismatch in software version, calibration identifier, or message format between the brake booster control module and the module requesting the data, so it flagged the incompatibility rather than a hardware failure.

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.