C1790 Code - Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure
Quick Answer
The Vehicle Dynamic Module (VDM) will command the air spring solenoid(s) ON or OFF when certain conditions are met. Common causes include Faulty Air Suspension Left Rear Air Spring/Shock Solenoid, Air Suspension Left Rear Air Spring/Shock Solenoid harness is open or shorted, Air Suspension Left Rear Air Spring/Shock Solenoid circuit poor electrical connection. 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
- C1790 indicates Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure.
- Common causes
- Common causes include Faulty Air Suspension Left Rear Air Spring/Shock Solenoid, Air Suspension Left Rear Air Spring/Shock Solenoid harness is open or shorted, Air Suspension Left Rear Air Spring/Shock Solenoid circuit poor electrical connection.
- 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 C1790 Description
What are the Possible Causes of the DTC C1790?
- Faulty Air Suspension Left Rear Air Spring/Shock Solenoid
- Air Suspension Left Rear Air Spring/Shock Solenoid harness is open or shorted
- Air Suspension Left Rear Air Spring/Shock Solenoid circuit poor electrical connection
- Faulty Vehicle Dynamic Module (VDM)
How to Fix the DTC C1790?
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 C1790 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 C1790 code?
Need more information on how to fix the C1790 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the C1790 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- C1790 Ford — Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure
- C1790 Lincoln — Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure
- C1790 Mercury — Air Suspension Left Rear Air Spring/Shock Solenoid Output Circuit Failure
Frequently Asked Questions about C1790 Code
1. What are the common symptoms of OBDII code C1790?
- Common symptoms of code C1790 include a noticeable decrease in ride quality, uneven suspension heights, and a dashboard warning light indicating air suspension issues.
2. What are the potential causes of OBDII code C1790?
- The code C1790 may be triggered by a faulty left rear air spring/shock solenoid, damaged wiring or connectors, a blown fuse, or issues with the air suspension control module.
3. How can I diagnose the cause of OBDII code C1790?
- To diagnose code C1790, use a diagnostic scanner to read the code and perform a visual inspection of the air suspension components, wiring, and connectors. Testing the left rear air spring/shock solenoid and checking for power and ground signals can help pinpoint the issue.
4. Can I still drive my vehicle with OBDII code C1790?
- It is not recommended to drive your vehicle with code C1790 as it can affect the ride quality, handling, and overall safety of your vehicle. Addressing the issue promptly is essential.
5. How can I repair OBDII code C1790?
- Repairing code C1790 involves replacing the left rear air spring/shock solenoid if faulty, repairing any damaged wiring or connectors, checking and replacing fuses if necessary, and resetting the trouble code.
6. Is it possible to reset OBDII code C1790 without fixing the underlying issue?
- While you can clear the trouble code using a diagnostic scanner, it is not recommended to reset the code without addressing the root cause. The issue will likely reoccur, leading to potential safety hazards and continued suspension problems.
7. Are there any preventive maintenance tips to avoid OBDII code C1790?
- Regularly inspecting the air suspension components, checking for leaks, maintaining proper air pressure, and addressing any suspension issues promptly can help prevent OBDII code C1790 from occurring.
8. Can extreme weather conditions trigger OBDII code C1790?
- Extreme weather conditions such as temperature fluctuations, humidity, or exposure to water can potentially exacerbate existing issues with the air suspension components and lead to triggering code C1790.
9. How long does it typically take to repair OBDII code C1790?
- The time required to repair code C1790 can vary depending on the exact cause of the issue, the availability of replacement parts, and the expertise of the person performing the repairs. In general, it may take a few hours to a day to address the problem.
10. Can I fix OBDII code C1790 myself, or should I take it to a professional mechanic?
- While some DIY enthusiasts may be able to diagnose and repair code C1790 themselves, it is recommended to seek assistance from a professional mechanic, especially when dealing with complex air suspension systems to ensure the issue is properly addressed.
Discuss the causes and fixes for C1790 OBDII Code
Code C1790 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
