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Home >> Toyota >> 2021 >> RAV4 LE, AWD >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (W/O Vacuum Brake Booster) - Diagnostic Codes (4 Of 8) >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster) >> DTC C124A-05: ECM Communication System Programming Failure [12/2021 - ] >> Description

DTC C124A-05: ECM Communication System Programming Failure [12/2021 - ]: Description

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
C124A-05 ECM Communication System Programming Failure When the vehicle speed is 40 km/h (25 mph) or more, one of the following conditions is met:
  • The engine type, powertrain variation and destination information sent from the hybrid vehicle control ECU do not match the information stored in the No. 2 skid control ECU (brake actuator assembly).
  • No system information stored in the No. 2 skid control ECU (brake actuator assembly).
  • Incorrect hybrid vehicle control ECU installed
  • No. 2 skid control ECU (brake actuator assembly)
Comes on
  • SAE Code: C124A
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
C124A-05 DTC DETECTION CONDITIONS

  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition When the vehicle speed is 40 km/h (25 mph) or more ◦ ◦
Malfunction Status The engine type, powertrain variation and destination information sent from the hybrid vehicle control ECU do not match the information stored in the No. 2 skid control ECU (brake actuator assembly) ◦ -
No system information stored in the No. 2 skid control ECU (brake actuator assembly) - ◦
Detection Time - -
Number of Trips 1 trip 1 trip

HINT: 

DTC will be output when conditions for either of the patterns in the table above are met.