C1620 — First Setup Not Completed | ALIGNMENT FAILED | 1st Set-up Not Completed | 1st Set-up Not Completed(Height Sensor Not Cailbrated)

Causes

• Initial calibration procedure was not performed after battery disconnect, control module replacement, or sensor replacement.
• Height/level sensor out of adjustment or mechanically stuck.
• Faulty height/level sensor.
• Open, shorted or corroded wiring/connectors between sensor and control module.
• Vehicle not placed on a level, flat surface during setup.
• Control module/software requiring reinitialization or update.

Symptoms

• Malfunction indicator lamp or a specific suspension/leveling warning message on the dash.
• Height/level control disabled or unavailable.
• Incorrect or uneven ride height; vehicle may sit too low or high on one corner.
• Headlight aim or leveling operation incorrect (if tied to level sensor).
• DTC stored in body/ABS/suspension control module; possible related communication faults.

What to check

• Check for other stored DTCs that may relate to height sensors, ABS, body or suspension modules.
• Verify battery voltage and charging system health before performing calibration.
• Inspect height sensor(s), linkages and mounting for corrosion, damage or binding.
• Inspect sensor connectors for corrosion, bent pins or water intrusion.
• Confirm vehicle is on a level, flat surface and parking brake applied before initializing.
• Use a scan tool to view live height sensor data and calibration status bits.

Signal parameters

• Height sensor voltage: typically ~0.5–4.5 V (varies by sensor type) — check manufacturer spec.
• Sensor position/raw counts: typical range 0–255 or 0–1023 depending on module.
• Calibration status flag: 0 = not calibrated, 1 = calibrated (binary).
• Communication/timeout: no comms or timeouts reported by control module.
• Height value in mm or % for each corner — compare left/right and front/rear for symmetry.

Similar codes

Causes

• Initial calibration procedure was not performed after battery disconnect, control module replacement, or sensor replacement.
• Height/level sensor out of adjustment or mechanically stuck.
• Faulty height/level sensor.
• Open, shorted or corroded wiring/connectors between sensor and control module.
• Vehicle not placed on a level, flat surface during setup.
• Control module/software requiring reinitialization or update.

Symptoms

• Malfunction indicator lamp or a specific suspension/leveling warning message on the dash.
• Height/level control disabled or unavailable.
• Incorrect or uneven ride height; vehicle may sit too low or high on one corner.
• Headlight aim or leveling operation incorrect (if tied to level sensor).
• DTC stored in body/ABS/suspension control module; possible related communication faults.

What to check

• Check for other stored DTCs that may relate to height sensors, ABS, body or suspension modules.
• Verify battery voltage and charging system health before performing calibration.
• Inspect height sensor(s), linkages and mounting for corrosion, damage or binding.
• Inspect sensor connectors for corrosion, bent pins or water intrusion.
• Confirm vehicle is on a level, flat surface and parking brake applied before initializing.
• Use a scan tool to view live height sensor data and calibration status bits.

Signal parameters

• Height sensor voltage: typically ~0.5–4.5 V (varies by sensor type) — check manufacturer spec.
• Sensor position/raw counts: typical range 0–255 or 0–1023 depending on module.
• Calibration status flag: 0 = not calibrated, 1 = calibrated (binary).
• Communication/timeout: no comms or timeouts reported by control module.
• Height value in mm or % for each corner — compare left/right and front/rear for symmetry.

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