What Does C0628 Mean?
This code indicates the suspension control module has detected a voltage signal from the level control position sensor that exceeds the normal operating range. The level control system uses this sensor to monitor suspension height and adjust air pressure or hydraulic fluid accordingly. A high circuit voltage typically means the sensor signal wire is shorted to voltage, the sensor itself has failed internally, or there is a wiring harness issue causing excessive voltage input to the control module.
Common Causes
45%
Faulty level control position sensor with internal short to voltage or degraded potentiometer
30%
Damaged wiring harness or sensor connector with signal wire shorted to power supply
15%
Corroded or damaged sensor connector terminals causing high resistance or short circuit
10%
Failed suspension control module providing incorrect reference voltage or misreading sensor input
Diagnostic Steps
1
Step 1: Perform a visual inspection of the level control position sensor and its wiring harness for obvious damage, chafing, pinched wires, or corrosion at the connector. Check sensor mounting for physical damage or misalignment that could affect operation.
2
Step 2: With ignition on and engine off, use a digital multimeter to backprobe the sensor signal wire at the connector and measure voltage. Compare reading against manufacturer specifications (typically 0.5-4.5V range). A reading above 4.8V confirms high circuit condition.
3
Step 3: Disconnect the level control position sensor connector and measure voltage on the signal wire from the harness side. If voltage remains high with sensor disconnected, the problem is in the wiring harness (short to power). If voltage drops to normal reference voltage, the sensor is faulty.
4
Step 4: Inspect the sensor connector terminals for corrosion, bent pins, or moisture intrusion using a flashlight and magnification. Clean terminals with electrical contact cleaner if corroded.
5
Step 5: If wiring is suspected, trace the sensor signal wire from connector to control module checking for damage, repair splices, or contact with hot components. Use a wiring diagram to identify all connector points and check for shorts to battery voltage using a multimeter in ohms mode with power disconnected.
6
Step 6: After replacing faulty sensor or repairing wiring, clear codes, perform a road test over varied terrain, and monitor live data from the level control system to verify sensor voltage remains within normal range during suspension travel and the code does not return.
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the suspension control module has detected a voltage signal from the level control position sensor that exceeds the normal operating range. The level control system uses this sensor to monitor suspension height and adjust air pressure or hydraulic fluid accordingly. A high circui...
The most common cause of C0628 (Level Control Position Sensor Circuit High) is: Faulty level control position sensor with internal short to voltage or degraded potentiometer
Typical repair costs for C0628 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive in most conditions, but the level control system will not function properly, potentially causing uneven ride height, reduced load-leveling capability, and degraded handling characteristics. Repair within a few weeks to restore proper suspension performance and prevent potential damage to suspension components from improper ride height.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0628 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Chassis
System
Suspension System (Active/Adaptive Suspension)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
