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Lost Communication With ABS Control Module

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1 source
  • Official data (NHTSA)official_feed

What U0121 means

Avoid long trips

The vehicle network has lost communication with the ABS/DSC control module.

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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.

Common causes

  • Lost Communication With ABS Control Module

What to check first

  1. Check wiring to the ABS/DSC module
  2. Verify battery and grounds
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