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C1739 Toyota Code - Right Rear Height Control Solenoid Valve Circuit

Quick Answer

The C1739 diagnostic trouble code (DTC) for Toyota vehicles specifically refers to an issue with the Right Rear Height Control Solenoid Valve Circuit. Common causes include Electrical issues: Corroded connectors, damaged wiring, or a faulty ECM can cause electrical issues in the circuit, Sensor malfunction: A malfunctioning height sensor can send inaccurate signals to the ECM, leading to height control problems, Solenoid valve failure: The solenoid valve itself may be faulty and unable to control the right rear suspension height. 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 Electrical issues: Corroded connectors, damaged wiring, or a faulty ECM can cause electrical issues in the circuit, Sensor malfunction: A malfunctioning height sensor can send inaccurate signals to the ECM, leading to height control problems, Solenoid valve failure: The solenoid valve itself may be faulty and unable to control the right rear suspension height.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code C1739 Toyota Description

The C1739 diagnostic trouble code (DTC) for Toyota vehicles specifically refers to an issue with the Right Rear Height Control Solenoid Valve Circuit. This means that there is a problem with the solenoid valve that controls the height of the right rear suspension in vehicles equipped with an air suspension system. The height control system is responsible for adjusting the vehicle's ride height based on various factors such as load, speed, and road conditions to ensure optimal handling and comfort.

OBDII Code C1739 Toyota - Right Rear Height Control Solenoid Valve Circuit
C1739 Toyota Code - Right Rear Height Control Solenoid Valve Circuit

Common Causes of C1739 Toyota

  1. Electrical issues: Corroded connectors, damaged wiring, or a faulty ECM can cause electrical issues in the circuit.
  2. Sensor malfunction: A malfunctioning height sensor can send inaccurate signals to the ECM, leading to height control problems.
  3. Solenoid valve failure: The solenoid valve itself may be faulty and unable to control the right rear suspension height.
  4. Wiring problems: Damaged or chafed wiring in the circuit can disrupt the signal communication between components.

Symptoms of C1739 Toyota

  1. Uneven ride height: The vehicle may sit lower on one side, indicating a problem with the right rear suspension.
  2. Rough ride quality: The vehicle may exhibit a harsh ride, especially over bumps or rough roads.
  3. Handling issues: The vehicle may feel unstable or exhibit poor handling characteristics, particularly during cornering.
  4. Warning light: The Check Engine Light or Suspension Warning Light may illuminate on the dashboard to indicate a problem with the suspension system.

How to Fix C1739 Toyota

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the right rear height control solenoid valve circuit.
  2. Inspect wiring and connectors: Check for any damaged or corroded wiring and connectors in the circuit and repair or replace as needed.
  3. Test solenoid valve: Test the functionality of the right rear height control solenoid valve to determine if it is operating correctly.
  4. Replace faulty components: If the solenoid valve, sensor, or ECM is found to be faulty, replace the defective component with a new one.
  5. Clear error codes: After completing the repairs, clear the DTC and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix C1739 Toyota

The cost of repairing the Right Rear Height Control Solenoid Valve Circuit issue can vary depending on the specific cause of the problem and the cost of parts and labor. On average, the repair costs for this type of issue can range from $200 to $500, including parts and labor. However, it's important to note that prices can differ based on the location, vehicle make and model, and the rates of the auto repair shop. Diagnostic time and labor rates can vary between $80 and $150 per hour, with dealerships and metropolitan areas typically charging higher rates. Independent shops may offer lower rates for the repair. It is recommended to contact local auto repair shops for a more accurate estimate based on the specific circumstances.

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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.

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