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Home >> Mazda >> 2021 >> CX-3 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (On-Board Diagnostic - Start Stop Unit) >> DTC U201F-12: Keyless Receiver Circuit Malfunction >> Notes

DTC U201F-12: Keyless Receiver Circuit Malfunction: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.
Description  Keyless receiver circuit malfunction
Detection condition 
  • Start stop unit detects that the keyless receiver circuit voltage of 6.2 V or more  for 0.5 s or more. 
Fail-safe  Not applicable
Possible cause 
  • Keyless receiver connector or terminal malfunction
  • Start stop unit connector or terminal malfunction
  • Short to power supply in wiring harness between start stop unit terminal 2Q and keyless receiver terminal A
  • Keyless receiver malfunction
  • Start stop unit malfunction
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