Level Control Position Sensor Circuit High (GM)
The C0628 code means the vehicle's onboard diagnostic system has detected: Level Control Position Sensor Circuit High (GM). This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $1,200 (position sensor or wiring; compressor or damper components at the high end)
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What Are the Symptoms of C0628?
- Ride height wrong or vehicle sagging
- Harsh or floaty ride
- Compressor running excessively or not at all
What Causes C0628? (Most Likely First)
- Fault in the electronic suspension/level control component this code names (Level Control Position Sensor Circuit High) High
- Damaged wiring or a corroded connector in that circuit - road-splash zones corrode connectors High
- Failed related sensor or actuator Moderate
- Control module fault Low
Can I Still Drive with C0628?
Yes, but fix soon. C0628 is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
What does C0628 mean?
C0628 is a chassis code used primarily by GM vehicles: Level Control Position Sensor Circuit High. It concerns the electronic suspension/level control system.
Can I keep driving with C0628?
Generally yes; the electronic suspension/level control system may be degraded. Diagnose soon, and treat any brake- or steering-related behavior change as urgent.
Is C0628 the same on every make?
The decimal C0xxx range is dominated by GM's assignments (Chevrolet, GMC, Buick, Cadillac). Other makes may use this ID differently - if your vehicle is not a GM product, verify the meaning in your make's service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose C0628?
-
Read the code with a GM-capable scan tool and note the symptom byte/subcode if shown.
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View live data for the named circuit (e.g. all four wheel speeds while rolling for wheel-speed codes).
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Inspect the circuit's wiring and connectors - chassis harnesses live in the splash zone and corrode first.
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Follow the GM pinpoint test for C0628 before replacing components.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get C0628?
- Chevrolet, GMC, Buick, Cadillac (GM chassis code range)
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