AutoCodes – Lincoln – C1991 Lincoln

C1991 Lincoln 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 Lincoln 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.

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Code Popularity 1,842

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C1991 Lincoln Description

The Air Suspension Control Module monitors the Plant Ride Height Setting. The Air Suspension Control Module sets the OBDII code when the Plant Ride Height Setting is not to factory specifications.

OBDII Code C1991 Lincoln - Plant Ride Height Setting And/Or Tests Incomplete - AutoCodes.com — C1991 Lincoln Code - Plant Ride Height Setting And/Or Tests Incomplete

What does this mean?

What are the Possible Causes of the DTC C1991 Lincoln?

Calibrate the ride heights

How to Fix the DTC C1991 Lincoln?

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 Lincoln 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.

Need more information about the C1991 Lincoln code?

Need more information on how to fix the C1991 Lincoln code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1991 Lincoln code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1991 Lincoln Code

1. What are the common symptoms of OBDII code C1991 in a Lincoln related to "Plant Ride Height Setting And/Or Tests Incomplete"?

- The common symptoms include a malfunction indicator light (MIL) on the dashboard, issues with ride height adjustment, and potential suspension problems.

2. What could cause the OBDII code C1991 in a Lincoln to trigger "Plant Ride Height Setting And/Or Tests Incomplete"?

- The code may be triggered due to a fault in the ride height sensor, a problem with the suspension system, or issues with the control module calibration.

3. How can I diagnose the OBDII code C1991 in a Lincoln related to "Plant Ride Height Setting And/Or Tests Incomplete"?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, inspecting the suspension components, checking the ride height sensors, and verifying calibration settings.

4. Are there any quick repair tips for resolving OBDII code C1991 in a Lincoln with "Plant Ride Height Setting And/Or Tests Incomplete"?

- Quick repair tips include checking the suspension connections for any loose or damaged parts, recalibrating the ride height sensors, and ensuring proper tire pressure.

5. Can driving with the OBDII code C1991 in a Lincoln related to "Plant Ride Height Setting And/Or Tests Incomplete" cause further damage?

- Continuing to drive with the code may lead to improper suspension performance, affecting ride comfort and handling. It is advisable to address the issue promptly.

6. Is it safe to ignore the OBDII code C1991 in a Lincoln indicating "Plant Ride Height Setting And/Or Tests Incomplete"?

- Ignoring the code can result in potential safety issues, as it may affect the Lincoln's suspension system and overall driving experience. It is recommended to address the problem as soon as possible.

7. How much does it typically cost to repair the OBDII code C1991 in a Lincoln with "Plant Ride Height Setting And/Or Tests Incomplete"?

- The cost of repair can vary depending on the exact cause of the issue. It may range from a simple sensor adjustment to a more complex suspension system repair, so it is advisable to consult a professional for an accurate estimate.

8. Can a DIY enthusiast fix the OBDII code C1991 in a Lincoln related to "Plant Ride Height Setting And/Or Tests Incomplete"?

- Some basic troubleshooting and repairs, such as checking connections and recalibrating sensors, can be done by a DIY enthusiast. However, more complex issues may require professional diagnosis and repair.

9. How long does it take to resolve the OBDII code C1991 in a Lincoln with "Plant Ride Height Setting And/Or Tests Incomplete"?

- The repair duration depends on the specific cause of the code. Simple fixes like sensor recalibration can be done quickly, while more involved repairs might take longer. It is best to consult a mechanic for an accurate timeframe.

10. Are there any preventive measures to avoid encountering the OBDII code C1991 in a Lincoln related to "Plant Ride Height Setting And/Or Tests Incomplete" in the future?

- Regular maintenance checks, including inspecting the suspension system and keeping the ride height sensors calibrated, can help prevent issues that may trigger the code.