AutoCodes – Lincoln – C1726 Lincoln

C1726 Lincoln Code - Air Suspension Rear Pneumatic Failure

Quick Answer

The Vehicle Dynamic Module (VDM) will command the air compressor and air solenoid valves to either fill or vent the air springs depending on the input from the 3 height sensors. Common causes include Air leak(s), Air line blockage(s), Air line(s). 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: C1726 Lincoln indicates Air Suspension Rear Pneumatic Failure.
Common causes: Common causes include Air leak(s), Air line blockage(s), Air line(s).
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 5,990

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 C1726 Lincoln Description

The Vehicle Dynamic Module (VDM) will command the air compressor and air solenoid valves to either fill or vent the air springs depending on the input from the 3 height sensors. The air compressor sends the air to the air springs first through the drier, then along the air lines, passing through several T-fittings and connections, through the air solenoid valves and finally to the air springs.

OBDII Code C1726 Lincoln - Air Suspension Rear Pneumatic Failure - AutoCodes.com — C1726 Lincoln Code - Air Suspension Rear Pneumatic Failure

What does this mean?

What are the Possible Causes of the DTC C1726 Lincoln?

Air leak(s)
Air line blockage(s)
Air line(s)
Mounting bracket(s)
Air compressor drier
Air spring solenoid valve(s)
Height sensor(s)
Air compressor
Faulty Vehicle Dynamic Module (VDM)
Air spring(s)

How to Fix the DTC C1726 Lincoln?

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 C1726 Lincoln 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 C1726 Lincoln code?

Need more information on how to fix the C1726 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C1726 Lincoln Code

1. What does the OBDII code C1726 mean for a Lincoln vehicle?

The code C1726 indicates a rear pneumatic failure in the air suspension system, meaning the system is having trouble maintaining proper air pressure at the rear.

2. What are common symptoms of the C1726 code?

Symptoms include a sagging rear suspension, uneven ride height, warning lights on the dashboard, and a rough or uncomfortable ride.

3. What causes the C1726 code to appear on a Lincoln?

Common causes include a faulty air spring, a leaking air line, a malfunctioning compressor, a defective height sensor, or electrical issues like damaged wiring.

4. Can I still drive my Lincoln with the C1726 code?

While the vehicle may still be drivable, continuing to drive with this issue can cause further damage to the suspension system and result in unsafe handling conditions.

5. How can I troubleshoot the C1726 code?

Start by inspecting the air springs and lines for leaks, checking the compressor for operation, and testing the rear height sensor and associated wiring for defects.

6. How do I fix the C1726 code on a Lincoln?

Repairs may involve replacing damaged air springs, repairing leaks in the air lines, replacing a faulty compressor, or fixing broken wiring and connectors.

7. How much does it cost to repair the C1726 code?

Repair costs vary depending on the issue, but air spring replacement can cost $500-$1,000 per side, while compressor replacement typically ranges from $700-$1,200.

8. Can I convert my air suspension to coil springs to avoid the C1726 code?

Yes, some owners opt for a coil spring conversion kit to eliminate air suspension problems. Kits typically cost $300-$800 plus labor.

9. What tools are needed to diagnose the C1726 code?

Youâ€™ll need an OBDII scanner capable of reading manufacturer-specific codes, a multimeter for electrical testing, and soapy water to check for air leaks.

10. How can I prevent the C1726 code from reoccurring?

Regularly inspect the air suspension system for leaks, ensure the compressor is functioning properly, and address any suspension issues promptly to avoid further damage.