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Top Tip - Mercedes

Hill Start and ESP Fault

Models  117, 156, 176, 246 with engine 270, 607, 651 CLA/GLA/A CLASS/B CLASS


ESP, BAS, PRE-SAFE, HOLD function, Hill-Start Assist and ESP trailer stabilization are all unavailable.
Adaptive brake assist and ATTENTION ASSIST warning on instrument cluster.
The brake system continues to operate normally. The support functions listed above may have failed. (An ignition cycle may reset these briefly)


One or more of the following faults regarding the accelerator pedal (B37) may be stored – P213800, P022664, P213862, P212714
These engine faults may cause faults in collision prevention assist and electric parking brake control unit.


  1. Check the contact pins of the accelerator pedal plug connector (B37) for possible widening or damage.
    • Make sure that testing is performed using the correct tool, to avoid pin damage.
  2. If damage or widening is found, disconnect the engine control unit plug connector F and M and reconnect once.
  3. Road test the vehicle, If the fault returns, then replace the pins for the (B37) pedal sensor connectors at the engine ECU connector end, and the pins at the B37 throttle pedal sensor end.
Note: The wiring loom pins are now modified by Mercedes and have changed to a different make and size.