C1991
Plant Ride Height Setting And/Or Tests Incomplete
C1991 is an OBD-II diagnostic trouble code meaning: Plant Ride Height Setting And/Or Tests Incomplete. Common causes: incomplete clearance calibration, malfunction of suspension level sensors. Estimated repair cost: $56–167.
Symptoms
- Incorrect vehicle clearance
- Error message on the dashboard
- Unstable operation of the air suspension
Causes
- Incomplete clearance calibration
- Malfunction of suspension level sensors
- Air suspension compressor problems
- Malfunctions in the electronic suspension control unit
- Broken or damaged wiring harnesses
How to Fix
- Check the condition of the suspension level sensors
- Check the operation of the air suspension compressor
- Carry out diagnostics of the electronic suspension control unit
- Calibrate clearance using diagnostic equipment
- Check the integrity of the wiring harnesses
Related codes
FAQ
What does the C1991 code mean?
C1991 is an OBD-II diagnostic trouble code that indicates: Plant Ride Height Setting And/Or Tests Incomplete
What causes a C1991 error code?
The most common causes of C1991 include: Incomplete clearance calibration; Malfunction of suspension level sensors; Air suspension compressor problems; Malfunctions in the electronic suspension control unit.
How do I fix a C1991 diagnostic trouble code?
To fix C1991: Check the condition of the suspension level sensors. Check the operation of the air suspension compressor. Carry out diagnostics of the electronic suspension control unit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with C1991?
Do not drive — repair immediately
How much does it cost to fix C1991?
The estimated repair cost for C1991 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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