AutoCodes – Lexus – C1A73 Lexus

C1A73 Lexus Code - Driving Support ECU Receive Data Malfunction

Quick Answer

If a communication error between the Driving Support ECU Assembly and another ECU is detected, Diagnostic Trouble Code (DTC) C1A73 is stored. Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Forward Recognition Camera, Faulty Driving Support ECU Assembly. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1A73 Lexus indicates Driving Support ECU Receive Data Malfunction.
Common causes: Common causes include Faulty Controller Area Network (CAN) Communication System, Faulty Forward Recognition Camera, Faulty Driving Support ECU Assembly.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 411

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 03, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code C1A73 Lexus Description

If a communication error between the Driving Support ECU Assembly and another ECU is detected, Diagnostic Trouble Code (DTC) C1A73 is stored. When the ignition switch is on for 2 seconds or more, a communication malfunction between the Forward Recognition Camera and the Driving Support ECU Assembly is detected for 5 seconds or more.

OBDII Code C1A73 Lexus - Driving Support ECU Receive Data Malfunction - AutoCodes.com — C1A73 Lexus Code - Driving Support ECU Receive Data Malfunction

What does this mean?

What are the Possible Causes of the DTC C1A73 Lexus?

Faulty Controller Area Network (CAN) Communication System
Faulty Forward Recognition Camera
Faulty Driving Support ECU Assembly

How to Fix the DTC C1A73 Lexus?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

When replacing the Forward Recognition Camera, always replace it with a new one. If a Forward Recognition Camera which was installed in another vehicle is used, the information stored in the Forward Recognition Camera will not match the information from the vehicle. As a result, a DTC may be stored.
If the Forward Recognition Camera has been replaced with a new one, be sure to perform Forward Recognition Camera learning.
When replacing the Driving Support ECU Assembly, always replace it with a new one. If a Driving Support ECU Assembly which was installed in another vehicle is used, the information stored in the Driving Support ECU Assembly will not match the information from the vehicle. As a result, a DTC may be stored.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1A73 Lexus code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.