C1724

Code

Other C — Chassis

Air Suspension Height Sensor Power Circuit Failure

Brand: Other

Type: C — Chassis

Views: UK: 16 EN: 54 RU: 25

AI status

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Page language: EN

Causes

Blown fuse or failed relay supplying the height sensor
Open or shorted wiring in the sensor power feed
Corroded or loose connector pins at the sensor or module
Failed height/position sensor
Faulty suspension control module or internal driver fault
Aftermarket modifications or physical damage to suspension linkages/wiring

Symptoms

Air suspension warning or service suspension message on dash
Incorrect ride height, sagging or one corner low
Compressor runs excessively or cycles frequently
Reduced suspension performance or limp/limited suspension mode
Related DTCs for height sensor open/short

What to check

Scan for active and stored codes; record freeze-frame and live sensor data
Visually inspect sensor, linkage, and wiring for damage, corrosion or disconnection
Verify fuses and relays that feed the suspension sensors and module
Back-probe sensor connector with ignition ON and measure supply voltage and ground
Check continuity of power feed and ground between sensor connector and suspension control module
Wiggle harness and connectors while monitoring voltage or live data for intermittent faults

Signal parameters

Sensor power feed: nominal battery/ignition supply (~11–14 V) with ignition ON (varies by vehicle)
Sensor reference (if used): typically ~5 V (varies by vehicle)
Sensor output: varies with ride height; usually 0.5–4.5 V or a variable resistance (check manufacturer spec)
Ground: near 0 V continuity to chassis ground
No voltage or severely low voltage on power pin indicates open/fuse/relay/wiring fault; >14 V or short to battery indicates short/relay stuck

Diagnostic algorithm

Retrieve code and vehicle-specific service information for C1724 to confirm definition and related codes.
Inspect harness, connectors and sensor for physical damage, corrosion, or contamination. Repair any visible faults.
With ignition ON (engine off), back-probe the sensor power pin and measure voltage; compare to expected battery/ignition voltage. Verify reference and ground pins as applicable.
If power is missing or low, check the fuse and relay that feed the sensor circuit. Replace if faulty and re-test.
Perform continuity checks between the sensor power pin and the suspension control module fuse/relay output to locate open or high-resistance wiring. Repair any breaks or chafing.
Check for short to ground or short to battery by isolating the sensor connector and measuring resistance to ground and battery. Disconnect module connectors as needed to isolate circuits.
If wiring and power are good, test or replace the height sensor. Confirm sensor output changes with suspension movement or lift.
If sensor and wiring are good but power feed is present, investigate the suspension control module for internal driver fault or reflash/update software per manufacturer bulletin.
Clear codes, perform a relearn/initialization procedure if required, and road test to confirm repair. Monitor live data for proper sensor operation.
Safety note: Support vehicle securely and relieve air suspension pressure per manufacturer procedures before working on suspension components or linkages.

Likely causes

Connector corrosion or disconnected harness at the height sensor
Blown fuse or failed relay for sensor power
Broken, chafed, or pinched power wire in the harness
Failed height sensor (internal power regulator)
Faulty ground at sensor or module

Fault status

⚠️ Status

Air suspension height sensor power circuit failure — sensor not receiving correct supply voltage. Check fuses/relays, wiring, connectors, ground and sensor.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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