AutoCodes – Generic – C1A01

C1A01 Code - Driving Support ECU

Quick Answer

For vehicles with Dynamic Radar Cruise Control System: This Diagnostic Trouble Code (DTC) indicates an internal malfunction of the driving support ECU assembly. Common causes include Faulty Driving Support ECU Assembly, Driving Support ECU Assembly harness is open or shorted, Driving Support ECU Assembly circuit poor electrical connection. 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: C1A01 indicates Driving Support ECU.
Common causes: Common causes include Faulty Driving Support ECU Assembly, Driving Support ECU Assembly harness is open or shorted, Driving Support ECU Assembly circuit poor electrical connection.
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 4,457

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 Feb 28, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1A01 Description

For vehicles with Dynamic Radar Cruise Control System: This Diagnostic Trouble Code (DTC) indicates an internal malfunction of the driving support ECU assembly. When the engine switch is on (IG) and the Dynamic Radar Cruise Control System is operating, the Driving Support ECU Assembly detects an internal malfunction for approximately 1 second.

For vehicles with Lane Departure Alert System (W/ Steering Control): If the forward recognition camera detects a malfunction in the internal circuit of the Driving Support ECU Assembly, DTC C1A01 is stored.

For vehicles with Pre-collision System: The Driving Support ECU Assembly uses the millimeter wave radar sensor assembly to detect obstacles in front of the vehicle. Based on signals from the millimeter wave radar sensor assembly, the Driving Support ECU Assembly calculated the risk of a collision and operates the pre-collision system when it determines that the risk is high.

OBDII Code C1A01 - Driving Support ECU - AutoCodes.com — C1A01 Code - Driving Support ECU

What does this mean?

What are the Possible Causes of the DTC C1A01?

Faulty Driving Support ECU Assembly
Driving Support ECU Assembly harness is open or shorted
Driving Support ECU Assembly circuit poor electrical connection
Faulty Forward Recognition Camera (For vehicles with Lane Departure Alert System)

How to Fix the DTC C1A01?

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 driving support ECU assembly, always replace it with a new one. If a driving support ECU assembly that 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.

When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera that 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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1A01 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.

Need more information about the C1A01 code?

Need more information on how to fix the C1A01 code? Get Access to Factory Service Manuals

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Get the C1A01 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1A01 Lexus — Driving Support ECU
C1A01 Toyota — Driving Support ECU

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.

Frequently Asked Questions about C1A01 Code

1. What are common symptoms of OBDII code C1A01 related to the Driving Support ECU?

The common symptoms include malfunction of driving support features like adaptive cruise control, lane departure warning, or automatic emergency braking.

2. What are the possible causes of OBDII code C1A01 related to the Driving Support ECU?

Potential causes include faulty sensors, wiring issues, software glitches, or a malfunctioning Driving Support ECU itself.

3. How can I diagnose the OBDII code C1A01 issue with the Driving Support ECU?

Diagnosis involves using a professional OBDII scanner to retrieve the fault codes, checking the related sensors and wiring for any visible damage, and performing a detailed inspection of the Driving Support ECU components.

4. Can OBDII code C1A01 be cleared/reset, or does it require immediate repair?

While the code can be cleared/reset using an OBDII scanner, it is advisable to address the underlying issue promptly to ensure the proper functioning of driving support systems.

5. Is it safe to continue driving with OBDII code C1A01 related to the Driving Support ECU?

It is not recommended to continue driving with this code present, as it may affect the operation of critical driving support features, compromising safety on the road.

6. How much does it typically cost to repair OBDII code C1A01 linked to the Driving Support ECU?

The repair cost can vary depending on the exact cause of the issue, but it may involve expenses for sensor replacement, wiring repairs, or ECU reprogramming, ranging from a few hundred to over a thousand dollars.

7. Can a DIY enthusiast fix OBDII code C1A01 associated with the Driving Support ECU?

While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, diagnosing and repairing complex issues with the Driving Support ECU often require professional automotive expertise.

8. How long does it usually take to repair OBDII code C1A01 concerning the Driving Support ECU?

The repair time can vary based on the specific problem identified, but it may take a few hours to a full day for diagnostics, parts replacement, and testing procedures.

9. Are there any preventive maintenance tips to avoid encountering OBDII code C1A01 related to the Driving Support ECU?

Regularly inspecting and maintaining the vehicle's sensors, wiring harnesses, and ECU components can help prevent issues that trigger this code and ensure the proper functioning of driving support systems.

10. Can weather conditions or road hazards trigger OBDII code C1A01 related to the Driving Support ECU?

Extreme weather conditions, road debris, or accidents can potentially damage sensors or wiring associated with the driving support systems, leading to the triggering of this code. Regular inspections after such events are advisable.