Ride Height Sensor Rear Left Circuit Malfunction
What does C0159 mean?
The C0159 code means the vehicle's onboard diagnostic system has detected: Ride Height Sensor Rear Left Circuit Malfunction. This is a moderate severity code.
Common Symptoms
- Suspension fault warning displayed
- Rear left of vehicle sagging
- Air suspension not leveling properly
- Headlights aimed incorrectly
- Rough ride quality over bumps
Probable Causes (Ranked by Likelihood)
- Failed rear left ride height sensor Very High
- Sensor linkage disconnected or broken High
- Water damage to sensor from road spray Moderate
- Wiring damage near rear suspension Low
Step-by-Step Diagnostic Procedure
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Scan suspension module for rear sensor DTCs
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Compare rear left sensor reading to rear right
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Inspect sensor and linkage at rear left corner
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Check for water damage at sensor connector
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Test sensor through full range of suspension travel
Frequently Asked Questions
Why do rear ride height sensors fail more often?
Rear sensors are more exposed to road spray, salt, and debris compared to front sensors. This exposure accelerates corrosion of the connector and sensor housing.
Can I drive with a failed ride height sensor?
You can drive short distances, but the suspension system may not level properly. The vehicle may sit unevenly and the ride quality will be degraded. Some vehicles limit speed.
What happens if I ignore this code?
The air suspension compressor may overwork trying to compensate for incorrect readings, potentially burning out. The uneven ride height also causes accelerated tire wear.