What does code P1847 mean?

Q: What does code P1847 mean?

Check DTC Memory Of Brake System ECU. P1847 is a Volkswagen-specific code that the transmission control module (TCM) sets when it cannot verify the brake system electronic control unit's (ECU) diagnostic memory. The TCM requests the brake ECU's stored fault codes over the vehicle's controller area network (CAN) data bus, and when that handshake fails or returns an implausible response, P1847 is logged to indicate that the brake ECU's memory must be checked directly.

DTC codes / Volkswagen codes / P1847

P1847 · VolkswagenCheck DTC Memory Of Brake System ECU

P1847 is a Volkswagen-specific code that the transmission control module (TCM) sets when it cannot verify the brake system electronic control unit's (ECU) diagnostic memory. The TCM requests the brake ECU's stored fault codes over the vehicle's controller area network (CAN) data bus, and when that handshake fails or returns an implausible response, P1847 is logged to indicate that the brake ECU's memory must be checked directly.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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