AutoCodes – Generic – C1739

C1739 Code - Right Rear Height Control Solenoid 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 Right Rear Height Control Solenoid Valve, Right Rear Height Control Solenoid Valve harness is open or shorted, Right Rear Height Control Solenoid 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: C1739 indicates Right Rear Height Control Solenoid Valve Circuit.
Common causes: Common causes include Faulty Right Rear Height Control Solenoid Valve, Right Rear Height Control Solenoid Valve harness is open or shorted, Right Rear Height Control Solenoid 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 4,779

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 C1739 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 C1739 - Right Rear Height Control Solenoid Valve Circuit - AutoCodes.com — C1739 Code - Right Rear Height Control Solenoid Valve Circuit

What does this mean?

What are the Possible Causes of the DTC C1739?

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

How to Fix the DTC C1739?

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 C1739 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 C1739 code?

Need more information on how to fix the C1739 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1739 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1739 Lexus — Right Rear Height Control Solenoid Valve Circuit
C1739 Toyota — Right Rear Height Control Solenoid Valve Circuit

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 C1739 Code

1. What does OBDII code C1739 mean?

C1739 indicates an issue with the Right Rear Height Control Solenoid Valve Circuit, which is part of the vehicle's suspension system responsible for maintaining proper ride height.

2. What are common symptoms of code C1739?

Symptoms may include uneven ride height, a sagging or raised rear end on the right side, suspension warning lights, or a noticeable decrease in ride comfort.

3. What causes the C1739 code to appear?

Common causes include a faulty height control solenoid valve, damaged wiring or connectors in the solenoid circuit, a malfunctioning air compressor, or a control module issue.

4. Can I drive my vehicle with a C1739 code?

Driving with this code may be possible, but it could lead to further suspension damage or compromised handling, especially if the ride height is uneven or the air suspension is not functioning properly.

5. How is the C1739 code diagnosed?

A mechanic will typically check the solenoid valve for proper operation, inspect the wiring and connectors, test the air compressor, and use an OBDII scanner to confirm the fault.

6. How do I fix the C1739 code?

Repairs may include replacing the right rear height control solenoid valve, repairing damaged wiring or connectors, or recalibrating the suspension system control module.

7. How much does it cost to repair code C1739?

Repair costs can vary depending on the issue, but replacing the solenoid valve typically costs between $150 and $400, including parts and labor.

8. Can a blown fuse cause the C1739 code?

Yes, a blown fuse in the suspension or solenoid circuit could disrupt power to the solenoid and trigger the code.

9. Do I need to recalibrate the suspension after fixing the C1739 code?

In many cases, suspension recalibration is necessary after repairs to ensure proper ride height and system functionality.

10. What tools are needed to troubleshoot code C1739?

Tools may include an OBDII scanner, a multimeter for checking electrical continuity, and possibly a suspension system diagnostic tool for recalibration.