BOSCH AUTO BOX GS2.38 - System Overview
The Bosch GS 2.38 Electronic Gearbox control system has only ever been found to be fitted to the P38 Range Rover. It is only fitted to this vehicle whenever it is Automatic and has either a Gems Petrol engine management or an EDC Diesel engine management system. After 1999 the P38 petrol engine management was changed to Motronic 5.2.1which has CAN bus communication capability ECU. However as the GS 2.38 does not have Can bus capability the system used in this vehicle was changed to the GS8.87.1 This system has quite limited self diagnostic capability.
SM028 - BOSCH AUTO BOX GS2.38 - System Help file
Version 1.27

BOSCH AUTO BOX GS2.38 - Known Fitments
Vehicle makes, models and variants known or believed to be using this vehicle system, required diagnostic lead and degree of known compatibility.

Vehicle Make Vehicle Model Vehicle Variant Diagnostic Lead
Land Rover Range Rover MKII (P38) Petrol > 1999 Black OBDII Lead
Land Rover Range Rover MKII (P38) Diesel > 2002 Black OBDII Lead

BOSCH AUTO BOX GS2.38 - Physical Details

SM028 - BOSCH AUTO BOX GS2.38 - Diagnostic Capabilities (Read Fault Codes)
Reads the fault code memory. The ECU can self detect up to 44 different problems with itself, its wiring and its associated sensors, storing the respective code if it detects any malfunction or reading outside of pre defined acceptable limits. Not all stored faults may cause the fault warning lamp to illuminate.

SM028 - BOSCH AUTO BOX GS2.38 - Diagnostic Capabilities (Clear Fault Codes)
Clears the fault code memory.

SM028 - BOSCH AUTO BOX GS2.38 - Diagnostic Capabilities (Settings)
Values, configuration settings, and other stored information which can be read from the ECU, edited and then rewritten back. Read settings can also be stored as a standard HTML page for reference. These pages can then later be re loaded and re written back to the ECU. Please note that some values may be read only due to the fact that they are supplied from the ECU’s ROM or are internally calculated.

  • Manufacturer: This is the name of the manufacturer of the ECU.
  • ZF Part Number: This is the ZF part number that can be read on the cover of the ECU.
  • Hardware version: This is the hardware version which denotes the processor and circuit board type.
  • Land Rover Part Number: This is Land Rover's part number for this ECU.
  • Manufacturer's Part Number: This is the manufacturer's part number.

SM028 - BOSCH AUTO BOX GS2.38 - Diagnostic Capabilities (Inputs)
Realtime live display of the information the electronic control unit of the selected vehicle system is currently deriving from it's input sensors.

  • Vehicle Speed: This is the speed of the vehicle in both, km/h and mph.
  • Output Shaft Speed: This is the output shaft speed in both, km/h and mph of the automatic gearbox
  • Engine Speed: This is the current engine speed in rpm.
  • Throttle Position: This is the status of the throttle.
  • Engine Power: This is the power of the engine read from the gearbox ECU.
  • Battery Voltage: This shows the battery voltage of the automatic gearbox ECU input.
  • Current Gear: This shows if the gear selection is in Park, Neutral, Drive or Reverse.