AutoCodes – Toyota – C1739 Toyota

C1739 Toyota 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 Toyota 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 1,308

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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

What does this mean?

What are the Possible Causes of the DTC C1739 Toyota?

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 Toyota?

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 Toyota 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.

Frequently Asked Questions about C1739 Toyota Code

1. What does the OBDII code C1739 mean on a Toyota?

C1739 indicates a problem with the right rear height control solenoid valve circuit in Toyota vehicles, which is part of the air suspension system.

2. What are the symptoms of code C1739 on a Toyota?

Common symptoms include uneven ride height, a sagging rear suspension on the right side, poor ride quality, or a suspension warning light on the dashboard.

3. What causes the C1739 code to appear?

The code can be triggered by a faulty height control solenoid valve, damaged wiring or connectors, a malfunctioning height sensor, or an issue with the air suspension control module.

4. Can I still drive my Toyota with a C1739 code?

Driving with this code is possible but not recommended, as it can affect the vehicle's handling, stability, and ride comfort.

5. How do I diagnose the C1739 code on my Toyota?

Start by inspecting the wiring and connectors to the right rear height control solenoid valve. Then test the solenoid valve for proper operation and check for any fault codes in the suspension control module.

6. How is the C1739 code fixed?

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

7. How much does it cost to fix the C1739 code?

Repair costs vary but typically range from $200 to $600, depending on whether the solenoid valve, wiring, or other components require replacement.

8. Can a weak air compressor cause the C1739 code?

While a weak air compressor can affect suspension performance, this code specifically relates to the right rear solenoid valve circuit and not the compressor itself.

9. Is it necessary to recalibrate the suspension after repairing a C1739 code?

Yes, recalibrating the suspension system may be necessary after repairs to ensure proper ride height and system functionality.

10. Can a blown fuse cause the C1739 code?

Yes, a blown fuse in the air suspension system can interrupt power to the solenoid valve and trigger this code. Always check fuses as part of the diagnostic process.