Skip to content
Book on WhatsApp

U020C

Lost Communication With Wireless Accessory Charging Module A

ECU lost communication with wireless accessory charging module A (Qi pad for phones). A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.

  • Check engine light: Yes
  • Emissions related: No
  • Repair difficulty: easy

Symptoms

  • Multiple warning lights may illuminate
  • Affected modules may go into limp mode or shut down
  • Specific functions inoperative depending on module
  • Diagnostic tools may show communication faults

Common causes

Ordered by how often each turns out to be the cause.

  • Module unpoweredCommon
  • Gateway module routing CAN messages incorrectlyLess likely
  • CAN terminating resistor (120 Ω) drifted out of specLess likely

Parts involved

  • Wireless Charging Module A
  • CAN Bus

U020C is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.