OBDII Code List

C1203 LEXUS - ECM Communication Circuit Malfunction

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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C1203 LEXUS Possible Causes

  • The wrong ECU or sensor was installed
  • Skid control ECU (Brake booster with master cylinder assembly)

First diagnose C1203 LEXUS code

    Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.

C1203 LEXUS Tech Notes

DTC C1203/95 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from that stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

Cost of diagnosing the C1203 LEXUS code

    Labor: 1.0

    The cost of diagnosing the C1203 LEXUS code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

C1203 LEXUS Possible Symptoms

  • Anti-Lock Brake System (ABS) Warning Light ON
  • Engine Light ON (or Service Engine Soon Warning Light)

C1203 Lexus Description

The circuit is used to send TR(A)C and VSC information from the skid control ECU to the power management control ECU, and hybrid control system information from the power management control ECU to the skid control ECU via the CAN communication system.

Identification information sent from other ECUs is stored when shipped from the factory and used as default values.

OBDII Code C1203 Lexus - ECM Communication Circuit Malfunction -

C1203 LEXUS More Information

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C1203 LEXUS Comments

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