What does code P1623 mean?

Q: What does code P1623 mean?

Data Bus Powertrain No Communication. P1623 on Volkswagen vehicles means the engine control module (ECM) has lost communication with other modules on the powertrain data bus, which is the high-speed network linking the engine, transmission, and anti-lock brake systems. The ECM sets this code when it stops receiving expected messages from those modules for a calibrated period, often because of a wiring fault, a failed module, or a power supply issue.

DTC codes / Volkswagen codes / P1623

P1623 · VolkswagenData Bus Powertrain No Communication

P1623 on Volkswagen vehicles means the engine control module (ECM) has lost communication with other modules on the powertrain data bus, which is the high-speed network linking the engine, transmission, and anti-lock brake systems. The ECM sets this code when it stops receiving expected messages from those modules for a calibrated period, often because of a wiring fault, a failed module, or a power supply issue.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyProfessional

AreaComputer and output circuits

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