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• Thamo

  Member Since: 04 May 2026

  Location: Colombo

  Posts: 1

   

  Discovery 5 L462 starting fault

  Hi everyone,
  I'm dealing with a frustrating intermittent no-start issue on a 2019 Range Rover discovery 5 L462.
  The vehicle sometimes starts and runs perfectly, but after it goes into sleep mode, it often fails to restart.
  I’ve been diving into the CAN Bus diagnostics and found some unusual readings at the OBD port (Pin 6 & 14).
  Here’s what I’ve observed:
  Resistance Test (Battery Disconnected): - OBD Pin 6 to 14 reads 120 Ohms.
  ABS Module Connector reads 60 Ohms.
  CHCM Module Connector reads 60 Ohms.
  ECM Connector (Module side) reads 120 Ohms.
  This suggests the physical trunk line and terminating resistors are intact.
  The Problem (Battery Connected): - When the battery is connected and the system is awake, my multimeter shows a "short to ground" behavior on the CAN lines when using continuity mode.
  Voltage Readings: I'm seeing a significant imbalance. CAN High is sitting around 3.0V and CAN Low is around 1.9V.
  The differential voltage is roughly 1.1V.
  Symptoms:
  The vehicle starts and runs fine as long as it doesn't go to sleep.
  Once it enters sleep mode,
  it occasionally fails to wake up or communicate, leading to a no-start condition.
  I suspect an internal short or a transceiver leak in one of the modules, possibly the Gateway Module (GWM).
  Has anyone encountered this specific voltage imbalance (3.0V / 1.9V) on the Bosch/Land Rover CAN systems?
  Could this be a failing GWM or perhaps water ingress in a specific location known for these models?
  Has anyone seen this specific imbalance (3.0V/1.9V) before?
  Could this point to a specific module "leaking" or a failing transceiver?
  Also, could someone confirm the exact location of the Gateway Module (GWM) on this 2019 model?
  I want to unplug it to see if the voltage stabilizes or if the "short" behavior at the OBD port clears up.
  Any advice on which module to isolate first based on these voltages would be greatly appreciated.
  
  Thanks in advance
  
  Post #42826 4th May 2026 9:16 am

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