AutoCodes – Lexus – C1735 Lexus

C1735 Lexus Code - Height Control Exhaust Valve Circuit

Quick Answer

The Suspension Electronic Control Unit (ECU) energizes the height control solenoid valve, which opens the valve and leads compressed air to the pneumatic cylinder, thus raising the vehicle height. Common causes include Faulty Height Control Exhaust Valve, Height Control Exhaust Valve harness is open or shorted, Height Control Exhaust Valve 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: C1735 Lexus indicates Height Control Exhaust Valve Circuit.
Common causes: Common causes include Faulty Height Control Exhaust Valve, Height Control Exhaust Valve harness is open or shorted, Height Control Exhaust Valve 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 4,033

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 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1735 Lexus Description

The Suspension Electronic Control Unit (ECU) energizes the height control solenoid valve, which opens the valve and leads compressed air to the pneumatic cylinder, thus raising the vehicle height. When the vehicle height is lowered, the ECU energizes not only the height control solenoid valve but also the exhaust valve which open the valve and discharge the compressed air in the pneumatic cylinder to the atmosphere. Front and rear height control valves have 2 solenoid valves to control right hand and left hand pneumatic cylinders separately. The exhaust valve is located on the compressor unit, and has one valve only.

OBDII Code C1735 Lexus - Height Control Exhaust Valve Circuit - AutoCodes.com — C1735 Lexus Code - Height Control Exhaust Valve Circuit

What does this mean?

What are the Possible Causes of the DTC C1735 Lexus?

Faulty Height Control Exhaust Valve
Height Control Exhaust Valve harness is open or shorted
Height Control Exhaust Valve circuit poor electrical connection
Faulty Suspension Electronic Control Unit (ECU)

How to Fix the DTC C1735 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1735 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.

Need more information about the C1735 Lexus code?

Need more information on how to fix the C1735 Lexus code? Get Access to Factory Service Manuals

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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.

Frequently Asked Questions about C1735 Lexus Code

1. What does the OBDII code C1735 mean on a Lexus?

C1735 indicates a problem with the Height Control Exhaust Valve Circuit, which is part of the air suspension system responsible for adjusting the vehicle's ride height.

2. What are common symptoms of the C1735 code on a Lexus?

Symptoms may include uneven ride height, a suspension warning light on the dashboard, or the air suspension failing to adjust properly.

3. What causes the C1735 code to appear on a Lexus?

Common causes include a faulty height control exhaust valve, damaged wiring or connectors in the circuit, or a malfunctioning suspension control module.

4. Can I drive my Lexus with the C1735 code active?

While it may be safe to drive short distances, the ride comfort and stability could be compromised, especially if the suspension system isn't functioning properly.

5. How do I troubleshoot the C1735 code on my Lexus?

Start by inspecting the exhaust valve and its wiring for damage, corrosion, or loose connections. You may also need to test the valve for electrical continuity and consult the vehicle's service manual.

6. How much does it cost to repair the C1735 code on a Lexus?

Repair costs depend on the exact issue but can range from $150 to $500 or more, especially if the height control exhaust valve or a related component needs replacement.

7. Can a blown fuse cause the C1735 code on a Lexus?

Yes, a blown fuse in the suspension control system circuit can interrupt power to the height control exhaust valve, triggering the C1735 code.

8. Do I need to replace the height control exhaust valve to fix the C1735 code?

Not always. The issue could be caused by wiring problems or a bad connection. Proper diagnostics should be performed before replacing any parts.

9. Can a software update fix the C1735 code on a Lexus?

In rare cases, a suspension control module software update might address the issue, but it's more commonly related to hardware faults like the valve or wiring.

10. Is the C1735 code unique to Lexus vehicles?

The C1735 code is specific to Lexus and some Toyota models equipped with air suspension systems, as it relates to their height control circuitry.