C1724 — Air Suspension Height Sensor Power Circuit Failure #

The wording for this DTC may vary depending on the vehicle manufacturer.

• Air Suspension Height Sensor Power Circuit Malfunction (Ford, Land Rover)
• Chassis Level Sensor Power Supply Circuit Fault (Toyota/Lexus)
• Height Sensor Power Circuit Error (Nissan/Infiniti)
• Suspension Level Sensor Circuit Failure (General Motors)

Summary for DTC C1724 #

The C1724 diagnostic trouble code (DTC) indicates a problem within the power circuit of the air suspension height sensor. The height sensor is an electronic device that communicates the position of the suspension to the vehicle’s computer, helping to maintain proper ride height regardless of load. When this circuit loses power or becomes faulty, the vehicle may struggle to adjust its suspension system automatically. You might encounter warning lights or changes in the vehicle’s ride quality. This code is most commonly found on vehicles equipped with electronic or pneumatic air suspension systems.

Frequent Symptoms for DTC C1724 #

When C1724 appears, you’ll likely notice some clear signs that something is off with your vehicle’s suspension system. The car may not maintain its standard ride height, or you might see dashboard warnings. Handling and comfort can also suffer, especially over bumps or when carrying extra passengers or cargo.

• Suspension warning light illuminated on dashboard
• Noticeable change in ride height (vehicle sits too high or too low)
• Increased body roll or instability during turns
• Unusual noises from the suspension, especially over bumps
• “Leveling” or “Air Suspension” error messages on the driver display
• Compressor running excessively or not at all

Probable Causes for DTC C1724 #

The root causes of C1724 are usually electrical, but some mechanical issues can trigger the code as well. Diagnosing requires a systematic approach to avoid overlooking simple problems.

1. Blown fuse or open circuit in the sensor power supply line
2. Corroded or loose electrical connectors at the height sensor or control module
3. Faulty air suspension height sensor itself
4. Damaged or pinched wiring harness between sensor and control module
5. Faulty suspension control module (less common)

Step-by-Step Diagnostic for DTC C1724 #

Proper diagnosis of C1724 involves checking both electrical and physical aspects of the suspension system. Begin with basic inspections and work toward more complex tests to pinpoint the exact fault.

• Read and record all DTCs using a scan tool; clear codes and see if C1724 returns.
• Visually inspect the height sensor and its wiring for obvious damage, corrosion, or disconnection.
• Check the relevant fuse(s) and relays in the power supply circuit; replace if blown.
• Test voltage at the height sensor connector with the ignition on—should be within OEM specifications (typically 5V or 12V supply, depending on model).
• Backprobe the harness and check for continuity and proper ground.
• Test the height sensor for resistance and output signal using a multimeter, referencing OEM specs.
• If all wiring and sensor tests pass, evaluate the suspension control module for faults.

Possible Repairs for DTC C1724 #

Once you’ve identified the source of the C1724 code, targeted repairs can restore normal suspension function. Always use parts that meet or exceed OEM standards.

• Replace or repair any blown fuse or faulty relay supplying power to the sensor
• Clean, tighten, or replace corroded or loose electrical connectors
• Repair or replace damaged wiring harness sections
• Replace the faulty air suspension height sensor
• In rare cases, replace or reprogram the suspension control module

Is It Safe to Drive with DTC C1724? #

Limited — You may be able to drive the vehicle for a short distance, but it is not recommended for extended use. The car’s handling, comfort, and stability can be compromised, especially under load or at highway speeds. In some cases, the suspension may remain at an abnormal height, increasing the risk of damage to undercarriage components or loss of control. If the vehicle displays a “suspension fault” or similar warning, have it checked and repaired as soon as possible.

Vehicles Most Affected by DTC C1724 #

C1724 is most commonly found on vehicles equipped with OEM air or automatic leveling suspension systems. The following models and brands are frequently associated with this code:

• Ford Expedition, Lincoln Navigator, Ford F-150 (with air suspension)
• Land Rover Range Rover, Discovery
• Toyota Land Cruiser, Lexus LX/GX series
• Nissan Armada, Infiniti QX series
• General Motors SUVs with autoride or magnetic suspension (Cadillac Escalade, GMC Yukon, Chevrolet Tahoe)

Common Mistakes & Best Practices for DTC C1724 #

When dealing with C1724, some common pitfalls can prolong repairs or lead to unnecessary part replacements. Avoiding these mistakes can save both time and money.

• Replacing the sensor without checking for blown fuses or damaged wiring
• Overlooking corroded or loose connectors, especially after exposure to water or road salt
• Assuming the control module is at fault without ruling out simple electrical issues
• Not clearing codes or conducting a test drive after repairs
• Neglecting to use OEM-quality replacement parts, which may cause recurrent faults

Quick FAQ for DTC C1724 #

Q: Will C1724 cause my suspension to fail completely?
A: Not always. While the air suspension may default to a fixed height or become less responsive, total failure is rare unless accompanied by additional codes or warnings.

Q: Can I reset the code by disconnecting the battery?
A: Disconnecting the battery may temporarily clear the code, but if the underlying issue persists, C1724 will return. Always diagnose and repair the root cause for a lasting fix.