What does it mean?
B2134 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Ignition Run/Start (Remote Start) Control Circuit High .
Symptoms
- Brake warning lamp stays illuminated at all times, sometimes even with the key off
- Lamp cannot be switched off by any function
- Fuse in the circuit blowing repeatedly
- Module will not enter sleep mode, leading to a flat battery after a few days
- Electric parking brake or brake assist inhibited by the stored fault
- Warning message in the display that does not clear
Likely causes
- Lamp output wire chafed against a permanently live conductor in the same loom
- Short to a hot feed inside the instrument cluster or its connector
- Previous repair that fed the lamp from the wrong supply, or an added accessory tapped into the circuit
- Water in a connector bridging the lamp output to an adjacent live pin
- Module output driver failed in the shorted state so the lamp is always powered
- Remote start module or relay backfeeding voltage into the ignition control circuit
- Corroded terminals in the cluster connector letting pins touch
- Instrument cluster internal fault backfeeding the shared lamp circuit
How to fix it
- Confirm the manufacturer definition and the pin assignment for this vehicle
- Unplug the module connector and measure the lamp output circuit for voltage, key off and key on
- If voltage is present with the module unplugged, the short is external, in the harness or the cluster
- If voltage only appears with the module connected, the driver inside the module has failed shorted
- Trace the circuit from the module to the cluster, inspecting every grommet and bracket for chafing
- Check the cluster connector for water and corrosion and dry it thoroughly
- Disconnect any aftermarket device wired into the lamp or ignition circuit
- Repair the short, then confirm the lamp goes out normally and the module sleeps after lock up