AutoCodes – Lexus – C1751 Lexus

C1751 Lexus Code - Continuous Electric Current To Height Control Compressor

Quick Answer

If the vehicle height control is attempted on a steeply sloping road, when the vehicle is overloaded, or when the vehicle is jacked up with the engine running, the compressor motor operates continuously to raise vehicle height, and causes electric current to flow to the AIR SUS relay for 100 seconds or longer. Common causes include Faulty Height Control Compressor, Height Control Compressor harness is open or shorted, Height Control Compressor 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: C1751 Lexus indicates Continuous Electric Current To Height Control Compressor.
Common causes: Common causes include Faulty Height Control Compressor, Height Control Compressor harness is open or shorted, Height Control Compressor 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 9,108

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1751 Lexus Description

If the vehicle height control is attempted on a steeply sloping road, when the vehicle is overloaded, or when the vehicle is jacked up with the engine running, the compressor motor operates continuously to raise vehicle height, and causes electric current to flow to the AIR SUS relay for 100 seconds or longer. Thus DTC C1751/51 may be output and vehicle height control may be suspended. (This is not electrically abnormal.) In this case, however, the vehicle height operation is resumed approx. 10 min. after the ignition switch is turned ON after the ECU detects the first error. If ECU detects another error, it takes 70 minutes until control is resumed.

OBDII Code C1751 Lexus - Continuous Electric Current To Height Control Compressor - AutoCodes.com — C1751 Lexus Code - Continuous Electric Current To Height Control Compressor

What does this mean?

What are the Possible Causes of the DTC C1751 Lexus?

Faulty Height Control Compressor
Height Control Compressor harness is open or shorted
Height Control Compressor circuit poor electrical connection

How to Fix the DTC C1751 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 C1751 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.

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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 C1751 Lexus Code

1. What are the common symptoms of OBDII code C1751 in a Lexus related to the Continuous Electric Current To Height Control Compressor?

- Common symptoms include the height control system not functioning properly, the vehicle sitting too low or too high, and warning lights on the dashboard.

2. What are the possible causes of OBDII code C1751 in a Lexus?

- Possible causes include a faulty height control compressor, issues with the height control sensors, wiring problems, or a malfunctioning height control module.

3. How can I diagnose the Continuous Electric Current To Height Control Compressor issue in my Lexus?

- Diagnosing the issue typically involves using a scan tool to retrieve the OBDII code C1751, inspecting the height control compressor, checking the height sensors, and examining the wiring for any damage.

4. Is it safe to drive my Lexus with OBDII code C1751 triggered?

- It is generally not recommended to drive the vehicle with this code triggered, as it can affect the vehicle's ride comfort and stability. It is best to address the issue promptly.

5. Can I repair OBDII code C1751 in my Lexus myself?

- Repairing this code may require specialized knowledge and tools, so it is advisable to seek assistance from a qualified mechanic or Lexus dealership for proper diagnosis and repair.

6. How much does it typically cost to fix OBDII code C1751 in a Lexus?

- The cost of fixing this code can vary depending on the root cause of the issue, but it may involve replacement of the height control compressor, sensors, or module, which can range from a few hundred to over a thousand dollars.

7. Are there any preventive measures to avoid triggering OBDII code C1751 in my Lexus?

- Regularly inspecting the height control system, ensuring proper maintenance of the vehicle's suspension components, and addressing any issues promptly can help prevent triggering this code.

8. Can OBDII code C1751 be intermittent or sporadic in a Lexus?

- Yes, this code can sometimes be triggered intermittently, especially if the issue is related to a loose connection or intermittent fault in the height control system components.

9. Will resetting the OBDII system clear the C1751 code in my Lexus?

- While resetting the OBDII system may temporarily clear the code, it is important to identify and address the root cause of the issue to prevent the code from reoccurring.

10. How long does it typically take to repair OBDII code C1751 in a Lexus?

- The repair time can vary depending on the exact cause of the code and the availability of parts, but it may take a few hours to a day for a mechanic to diagnose and fix the issue.