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B128F31 — DSRC card reader - no communication

DSRC card reader - no communication. The Taycan, 911 (992), Panamera (971), Panamera (972) and Cayenne report this code; below is which control unit sets it on each model and how to read and clear it.

Which models and control units set B128F31

Porsche Taycan

Information Control Unit

Porsche 911 (992)

MIB2 (Zentralrechner)

Porsche Panamera (971, 2017–2023)

MIB2 (Zentralrechner)

Porsche Panamera (972, 2024–)

MIB3 (Zentralrechner)

Porsche Cayenne (9YA)

MIB2 (Zentralrechner)

How to read and clear B128F31

  1. Plug a standard ENET (Ethernet-to-OBD) cable into your Porsche's OBD port and your Mac or Windows PC.
  2. Open STEUER14, pick your car and run a fault scan: every control unit is read, and B128F31 shows with its status, its full description and the freeze frame when the unit stores one.
  3. Fix the cause first, then clear the fault memory and scan again to check it stays away. Reading and clearing fault codes is free on every control unit.

More about fault memory in the manual →

Download STEUER14 — free fault reading

Other codes of the Information Control Unit

B126E13FM antenna amplifier 2 - open circuit
B127013Digital radio (DAB), antenna amplifier - open circuit
B127213AM/FM antenna - open circuit
B127313FM antenna 2 - open circuit
B127413Digital radio (DAB) antenna - open circuit
B128E31VICS antenna - no communication
B129011DSRC antenna - short circuit to ground
B129013DSRC antenna - open circuit
B129107Operator control unit in front center console - mechanical fault
B1291F0Operator control unit in front center console - reset line, electrical fault
B1291F2Operator control unit in front center console, rotary knob for menu selection
B1291F3Operator control unit in front center console, media source selection button "MEDIA"

All 614 codes of this control unit →

Fault names come from the manufacturer's diagnostic data. STEUER14 is independent and not affiliated with Porsche AG. A code tells you what a control unit detected, not always which part failed — check wiring, supply voltage and related codes before replacing parts. STEUER14 shows each fault's full description, status and freeze frame on the car.