What Does C1744 Mean?
The lift/dive signal from the suspension or body control system has a discrete fault. This signal communicates braking (dive) and acceleration (lift) conditions to the active suspension system so it can proactively adjust damping. With this fault, the suspension cannot anticipate body pitch changes, resulting in more pronounced nose dive during braking and squat during acceleration.
Common Causes
30%
Faulty accelerometer or pitch sensor providing incorrect lift/dive signal data
25%
Wiring harness fault in the lift/dive signal circuit — open, short, or high resistance
20%
Suspension control module not receiving proper input from the brake or acceleration system
15%
CAN bus communication error between the modules that share this signal
10%
Corroded or damaged connector at the sensor or module providing the signal
Diagnostic Steps
1
Check for additional codes in the ABS/stability control module and suspension module — the lift/dive signal often originates from the ABS module's accelerometer data shared over CAN bus.
2
Monitor the lift/dive signal in scan tool live data during braking and acceleration — the signal should change predictably with vehicle dynamics. A stuck or erratic signal indicates a sensor fault.
3
Inspect the accelerometer/pitch sensor (typically mounted on the vehicle floor or near the center of gravity) for secure mounting, connector integrity, and physical damage.
4
Check the CAN bus communication between the ABS module and suspension module — verify there are no U-codes (communication fault codes) stored that would indicate a data-sharing failure.
5
If a discrete (hardwired) signal rather than CAN bus, check the wire from the source module to the suspension module for continuity and proper voltage levels during dynamic conditions.
Estimated Repair Cost
$150 - $1,000
Parts + labor, varies by vehicle and location
The lift/dive signal from the suspension or body control system has a discrete fault. This signal communicates braking (dive) and acceleration (lift) conditions to the active suspension system so it can proactively adjust damping. With this fault, the suspension cannot anticipate body pitch changes,...
The most common cause of C1744 (Lift/Dive Signal Discrete Fault) is: Faulty accelerometer or pitch sensor providing incorrect lift/dive signal data
Typical repair costs for C1744 range from $150 to $1,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle can be driven but active suspension performance is degraded. The system cannot anticipate braking dive or acceleration squat, resulting in more body pitch than normal. This may slightly increase braking distances and reduce passenger comfort. Drive moderately and avoid aggressive braking or acceleration.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1744 to identify the root cause.
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Quick Info
Category
Chassis
System
Active Suspension
Difficulty
Type
Manufacturer
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