AutoCodes – Generic – C1785

C1785 Code - Steering Control ECU Communication Error

Quick Answer

The Suspension Control ECU receives signals from the Steering Control ECU via CAN communication. Common causes include Faulty Steering Control ECU, Steering Control ECU harness is open or shorted, Steering Control ECU 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: C1785 indicates Steering Control ECU Communication Error.
Common causes: Common causes include Faulty Steering Control ECU, Steering Control ECU harness is open or shorted, Steering Control ECU 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 1,949

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 Nov 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1785 Description

The Suspension Control ECU receives signals from the Steering Control ECU via CAN communication. When there is a communication malfunction, it will be detected by the diagnosis function.

OBDII Code C1785 - Steering Control ECU Communication Error - AutoCodes.com — C1785 Code - Steering Control ECU Communication Error

What does this mean?

What are the Possible Causes of the DTC C1785?

Faulty Steering Control ECU
Steering Control ECU harness is open or shorted
Steering Control ECU circuit poor electrical connection
Faulty Suspension Control ECU

How to Fix the DTC C1785?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1785 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 C1785 code?

Need more information on how to fix the C1785 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1785 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1785 Lexus — Steering Control ECU Communication Error
C1785 Toyota — Steering Control ECU Communication Error

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 C1785 Code

1. What are the common symptoms of OBDII code C1785 (Steering Control ECU Communication Error)?

- Common symptoms include the ABS warning light and traction control light illuminating on the dashboard, loss of power steering assistance, and potential steering wheel vibration.

2. What are the possible causes of OBDII code C1785?

- The code can be caused by a faulty steering control ECU, damaged wiring or connectors in the communication circuit, or issues with the CAN bus communication system.

3. How can I diagnose the source of OBDII code C1785?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific fault codes related to the steering control ECU communication error and performing a thorough inspection of the wiring and connectors.

4. Are there any DIY repair tips for OBDII code C1785?

- DIY repair tips include checking and repairing any damaged wiring or connectors in the communication circuit, ensuring proper grounding, and resetting the fault codes after making repairs.

5. Can driving with OBDII code C1785 pose any safety risks?

- Driving with this code may result in loss of power steering assistance, which can make steering more difficult, especially at low speeds or during maneuvers. It is recommended to address the issue promptly.

6. Is it possible to reset OBDII code C1785 without fixing the underlying issue?

- While resetting the code may temporarily turn off the warning lights, the issue causing the communication error will likely persist and trigger the code again. It is essential to address the root cause of the problem.

7. Should I replace the steering control ECU if I encounter code C1785?

- It is recommended to diagnose the specific cause of the communication error before replacing the steering control ECU, as the issue could also be related to wiring or connector problems.

8. Can extreme weather conditions contribute to triggering OBDII code C1785?

- Extreme temperatures or moisture can potentially affect the wiring and connectors in the communication circuit, leading to a steering control ECU communication error. Insulating or protecting these components may help prevent issues.

9. Is it necessary to visit a mechanic for OBDII code C1785 repair?

- While some DIY repairs are possible for this code, seeking professional help from a qualified mechanic with experience in diagnosing and repairing steering control ECU communication errors is recommended for more complex issues.

10. How can regular maintenance help prevent OBDII code C1785 from occurring?

- Regularly inspecting and maintaining the steering system, including checking the wiring and connectors, keeping them clean and secure, can help prevent issues that may trigger the steering control ECU communication error.