AutoCodes – Toyota – C1751 Toyota

C1751 Toyota 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 Toyota 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 8,345

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

What does this mean?

What are the Possible Causes of the DTC C1751 Toyota?

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 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 C1751 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 C1751 Toyota Code

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

- Common symptoms include a malfunctioning height control system, uneven ride height, and an illuminated height control warning light on the dashboard.

2. What can cause OBDII code C1751 to trigger in a Toyota?

- The code C1751 is typically triggered by a fault in the height control compressor, such as a short circuit or open circuit in the electrical system.

3. How can I diagnose the issue causing OBDII code C1751 in my Toyota?

- Diagnosing the issue involves checking the wiring harness for any damage, testing the compressor motor for proper operation, and ensuring the compressor relay is functioning correctly.

4. Is it safe to drive my Toyota with OBDII code C1751 active?

- It is not recommended to drive the vehicle with the code active, as it can affect the vehicle's suspension system and lead to potential safety hazards.

5. Can I reset OBDII code C1751 in my Toyota by disconnecting the battery?

- While disconnecting the battery may temporarily clear the code, it is important to address the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair OBDII code C1751 in a Toyota?

- The cost of repairing OBDII code C1751 can vary depending on the specific issue causing the code, but it may involve replacing the height control compressor or repairing the electrical system, which can range from a few hundred to over a thousand dollars.

7. Are there any DIY tips for fixing OBDII code C1751 in a Toyota?

- DIY tips may include checking and cleaning electrical connections, inspecting the wiring harness for damage, and testing the compressor motor for continuity to identify potential issues.

8. Will OBDII code C1751 affect the overall performance of my Toyota?

- While the code may not directly impact the drivability of the vehicle, it can affect the suspension system's operation and overall ride comfort.

9. How long does it typically take to repair OBDII code C1751 in a Toyota?

- The repair time for OBDII code C1751 can vary depending on the extent of the issue, but it may take a few hours to a full day to diagnose and repair the problem.

10. Can a mechanic easily fix OBDII code C1751 in a Toyota, or is it a complex issue?

- A qualified mechanic with experience in handling suspension and electrical systems should be able to diagnose and repair OBDII code C1751 in a Toyota, but the complexity of the issue may require specialized knowledge and tools.