C1790 Mercury 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 Mercury 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 Mercury Description
What are the Possible Causes of the DTC C1790 Mercury?
- 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 Mercury?
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 Mercury 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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Frequently Asked Questions about C1790 Mercury Code
1. What does the OBDII code C1790 mean on a Mercury vehicle?
C1790 indicates a failure in the left rear air spring/shock solenoid output circuit, which is part of the air suspension system.
2. What are the symptoms of code C1790 on a Mercury?
Common symptoms include an uneven or sagging suspension, a noticeable drop in the rear-left corner of the vehicle, or a suspension warning light on the dashboard.
3. What causes the C1790 code to trigger?
This code can be caused by a faulty air suspension solenoid, damaged wiring or connectors in the circuit, or a malfunctioning air suspension control module.
4. Can I drive my Mercury with the C1790 code active?
While the vehicle may still be drivable, continued use can lead to further damage to the suspension system and compromised ride quality or handling.
5. How do I diagnose the C1790 code on a Mercury?
Start by visually inspecting the wiring and connectors for damage or corrosion, then test the solenoid and circuit continuity with a multimeter. Check for signal output from the air suspension control module.
6. How do I fix the C1790 code on my Mercury?
Repairs may include replacing the left rear air suspension solenoid, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming/replacing the air suspension control module if necessary.
7. Can a blown fuse cause the C1790 code?
Yes, if the fuse for the air suspension system is blown, it can result in a loss of power to the solenoid circuit and trigger the code.
8. How much does it cost to repair the C1790 code?
Repair costs vary depending on the issue but can range from $100 to $600, with solenoid replacement being less expensive and control module replacement costing more.
9. What tools are needed to fix the C1790 code?
You’ll need a diagnostic scanner, a multimeter, and possibly wiring repair tools. In some cases, specialized tools for air suspension components may be required.
10. Can I reset the C1790 code without fixing the problem?
While you can clear the code using a diagnostic scanner, it will likely return if the underlying issue is not resolved.
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