C1991 Ford Code - Plant Ride Height Setting And/Or Tests Incomplete
Quick Answer
The Air Suspension Control Module monitors the Plant Ride Height Setting. Common causes include Calibrate the ride heights. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- C1991 Ford indicates Plant Ride Height Setting And/Or Tests Incomplete.
- Common causes
- Common causes include Calibrate the ride heights.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code C1991 Ford Description
How to Fix the DTC C1991 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the C1991 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Need Help with the Code?
Get the C1991 Ford code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about C1991 Ford Code
1. What does the OBDII code C1991 mean on a Ford vehicle?
C1991 indicates that the plant ride height setting and/or tests for the suspension system are incomplete, often related to the air suspension calibration process.
2. What are the common symptoms of the C1991 code?
Symptoms may include an illuminated suspension warning light, improper ride height, a sagging suspension, or uneven vehicle stance.
3. What causes the C1991 code to appear?
The code is typically caused by incomplete ride height calibration, a failed air suspension component, or communication issues with the suspension control module.
4. Can I drive my Ford with the C1991 code active?
It may be possible to drive, but improper ride height can affect handling and safety. It’s best to address the issue promptly to avoid further damage.
5. How do I clear the C1991 code?
Clearing the code requires completing the suspension calibration procedure using a scan tool capable of accessing the suspension control module.
6. What tools are needed to diagnose the C1991 code?
You’ll need a professional-grade OBDII scan tool with suspension system capabilities and potentially a vehicle lift or jack to inspect the suspension components.
7. Could a faulty ride height sensor trigger the C1991 code?
Yes, a malfunctioning ride height sensor can prevent proper calibration and trigger the code.
8. How much does it cost to fix the C1991 code?
Repair costs vary depending on the issue but typically range from $100 to $500 for diagnostics, calibration, or replacing faulty components.
9. Does the C1991 code always require part replacement?
Not always. Sometimes the issue can be fixed by completing the calibration process or addressing software-related problems in the suspension control module.
10. Can a low battery voltage cause the C1991 code?
Yes, low battery voltage can disrupt the suspension system's calibration process and cause the code to appear. Always ensure the battery is fully charged before diagnosing.
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