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Bosch MG1CS201MS - TC298

Bosch MG1CS201MS - TC298 | FAQ & Error Solutions

Bosch MG1CS201MS - TC298

Errors

Find the most common error codes and connection issues encountered when working with the Bosch MG1CS201MS ECU across BMW and Alpina platforms.

Bootloader was not present on server

This error occurs when attempting OBD programming on a protected ECU typically found in BMW models produced from 2019 onwards.

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7F-23-10: UDS readMemoryByAddress Rx error

Indicates that the ECU likely has an active anti-read protection from a previous tuning tool, blocking standard OBD access.

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TSW TransferData RX error

A communication error during Bench mode, usually caused by physical wiring faults or unstable pin connections.

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TSW ReadEcuIdentification RX error

Failure to identify the control unit on the bench, typically pointing toward incorrect or loose wiring pins.

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Concerns vehicles from

Alpina BMW

Bootloader was not present on server

Method: OBD / Recovery: Bench

Issue: Direct OBD programming is blocked because the ECU's software version is protected by factory security measures.

Solution
  • Verify the production date; if the ECU was produced before 06/2020, proceed with Bench mode.
  • Switch your connection method to BENCH mode.
  • Perform a full read of the ECU in Bench mode.
  • Flash the file you just read back onto the ECU without modifications using Bench mode.
  • This process applies an OBD unlock patch, enabling future operations via OBD.
To understand more

BMW implemented enhanced security on ECUs from 2019 onwards, preventing external tools from loading bootloaders via the diagnostic port. By performing a "read-write" cycle in Bench mode, the software bypasses the security signature check and patches the memory to allow standard OBD communication.

7F-23-10: UDS readMemoryByAddress Rx error

Method: OBD / Recovery: Bench

Issue: The tool is unable to read the ECU memory through OBD because of an existing anti-read lock in the software.

Solution
  • Acknowledge that OBD reading is not possible for this specific unit.
  • Remove the ECU from the vehicle and prepare for a BENCH mode connection.
  • Attempt to read the ECU using the Bench protocol to bypass the software-level protection.
To understand more

This error specifically triggers when a previous tuner has used a tool that activates a "No-Read" flag in the ECU's configuration. Bench mode is more effective because it communicates directly with the processor, ignoring the OBD-level diagnostic restrictions.

TSW TransferData RX error

Method: Bench

Issue: The data transfer between the ECU and the tool failed during a Bench operation due to hardware link instability.

Solution
  • Thoroughly verify your wiring pin-by-pin against the official connection diagram.
  • Check that all pins are inserted correctly and have solid, stable contact with the ECU connector.
  • Ensure the power supply to the tool and ECU is consistent and sufficient.
To understand more

TransferData errors are almost exclusively physical layer issues. A tiny gap or high resistance in a CAN-High or CAN-Low connection can cause data packets to drop, resulting in a receive (RX) error on the tool's side.

TSW ReadEcuIdentification RX error

Method: Bench

Issue: The tool cannot identify the ECU model or serial information over the established Bench connection.

Solution
  • Check your wiring setup meticulously and ensure all pin-outs match the required documentation.
  • Verify that the ECU pins are not bent, oxidized, or loose.
  • Ensure the ground and power connections are properly seated.
To understand more

Identification is the first step of any protocol. If the physical link is poor, the tool cannot send the "Who are you?" request to the ECU, or the ECU's response is lost before reaching the tool. This is usually corrected by reseating the connectors.