The BimmerECU ECA uses PT CAN 2 via the TMS harness. Both MHD and EcuTek default to PT CAN, so you must manually change the ethanol analyzer setting to “Zeitronix” in your tuning app. “Zeitronix” is the correct preset because it matches the CAN protocol used by the BimmerECU ECA.

Bootmod3 uses PT CAN, which is compatible with the BimmerECU as long as the device is connected to the correct CAN line (PT CAN in this case). TMS Flex Fuel instructions are designed to connect into PT CAN 2.

Check that the ethanol sensor is on the main line (not on the return line). Ethanol sensors placed on a return fuel line may give false readings because there isn’t constant flow of fuel through the sensor.

Check for CAN Hi and CAN Low being reversed. This is the most common cause.

Crank sensor is either not connected or connected to the oil pressure sensor instead of the crankshaft position sensor.

• Confirm the correct firmware version is installed based on your ReFlex serial number.
• If TunerPro shows ethanol content but your tuning app does not, double-check that Motiv ReFlex is selected in the app’s ethanol analyzer settings.

Often caused by incorrect wiring of a secondary low-pressure fuel pump (LPFP). Some aftermarket LPFPs (e.g., from Vader Solutions) have reversed power and ground.

• Solution: Refer to the correct pinout for the secondary LPFP before connecting. Find link below:

If you've installed a top-mount turbo, verify that the TMS harness is still connected to the PCV heater (ReFlex gets power here).

• Check Voltage: Use a multimeter to confirm 12V at the OEM PCV connector.
• Note: Incorrect LPFP wiring can damage the Integrated Power Supply Module near the DME. If there is no power, inspect and possibly replace this module.

Check in TunerPro: If ethanol data is visible in TunerPro, the ReFlex is working.

In the MHD app:

• Go to ECA settings and select "ReFlex" as the analyzer.
• Your tuner may also need to switch the CAN setting from PT CAN to PT CAN 2 within the tune.

This error indicates a CAN communication issue.

• Make sure the CAN High and CAN Low wires are not reversed. A reversed CAN will cause a persistent error.
• If the wiring is correct, open TunerPro and confirm you can see live data (ethanol content, fuel pressure, etc.).
• If TunerPro shows data but the MHD app does not, the ReFlex likely needs reprogramming. Contact Motiv support.

Triggered when no crank signal is detected. 

Common Cause: The harness is mistakenly connected to the oil pressure sensor instead of the crankshaft position sensor—they are located close together.

Fix: Reconnect the TMS harness to the correct sensor.

If all injectors are plugged in and this code still appears:

Common Cause: Crank sensor is wired to the oil sensor, causing both this error and a crank sensor error (MHD009).

Fix: Verify crank sensor is connected properly.

Ensure the TMS harness is connected to the correct camshaft position sensor.

• BootMod3 requires the ReFlex to be connected to PT CAN only.
• If it’s connected to PT CAN 2, data logging and communication will not function.

• Check TunerPro: If TunerPro shows ethanol/fuel pressure data, the ReFlex is working.
• Conclusion: The issue is with ReFlex communication to the car’s ECU – recheck wiring and ECU CAN configuration.