C1890 – OBD-II DTC

OBD-II DTC C1890 – Air Suspension LF Height Sensor Circuit Open

DTC C1890 meaning

DTC C1890 refers to a diagnostic trouble code indicating an open circuit in the left front height sensor of the air suspension system. This sensor is responsible for measuring the height of the vehicle’s left front corner and providing feedback to the air suspension control module. An open circuit means that there is a break in the electrical connection, preventing the sensor from sending accurate data to the control module.

DTC C1890 symptoms

Common symptoms associated with DTC C1890 may include:

• Warning light illuminated on the dashboard
• Uneven ride height or sagging on the left front side
• Inconsistent air suspension performance
• Vehicle may not level properly when loaded

DTC C1890 causes

Several factors can lead to the occurrence of DTC C1890, including:

• Faulty left front height sensor
• Damaged wiring or connectors in the sensor circuit
• Corrosion or poor connections at the sensor or control module
• Issues with the air suspension control module itself

DTC C1890 seriousness

DTC C1890 is considered a moderate to serious issue. While it may not immediately affect the drivability of the vehicle, it can lead to uneven tire wear, compromised handling, and potential safety concerns due to improper vehicle height. Addressing this code promptly is essential to maintain optimal vehicle performance and safety.

How to diagnose DTC C1890

To diagnose DTC C1890, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the C1890 code.
2. Inspect the left front height sensor and its wiring for visible damage or disconnections.
3. Check the electrical connectors for corrosion or loose connections.
4. Test the height sensor’s resistance and voltage output according to manufacturer specifications.
5. Examine the air suspension control module for any faults or issues.

How to fix DTC C1890 step-by-step instructions

To fix DTC C1890, follow these steps:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors related to the left front height sensor.
3. If the height sensor is faulty, replace it with a new one.
4. Reconnect all electrical connections securely and ensure there is no corrosion.
5. Reconnect the vehicle’s battery.
6. Clear the DTC using an OBD-II scanner and perform a test drive to verify the repair.

How to erase DTC C1890

To erase DTC C1890, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the vehicle to ensure the code does not reappear.

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