Severity Medium
C1845

Front Inflate Solenoid Circuit Malfunction

📅 Last reviewed: July 2026
What does the C1845 code mean?

The air suspension control module has detected a fault in the front inflate solenoid output circuit. This indicates an open circuit, short to ground, or short to voltage in the wiring or the solenoid itself, preventing precise control of air pressure in the front air springs.

Medium
Severity
Variable
Typical Cost
Medium
Frequency

1. Commonly Affected Makes

FordLincolnMercury

2. Most Common Causes

3. Symptoms You Will Notice

4. Step-by-Step Diagnosis

1

Scan for additional codes and check freeze frame data

2

Visually inspect wiring and connectors for damage, corrosion, or loose connections

3

Test solenoid resistance and compare to specifications

4

Check for power and ground at the solenoid connector with a multimeter

5

If wiring and solenoid test OK, suspect the control module

5. Frequently Asked Questions

Is it safe to drive?

Driving is possible but not recommended for long distances. The front suspension may sag, affecting handling and ride comfort. Have it diagnosed promptly.

How much does it cost to fix?

Repair costs typically range from $200 to $800, depending on whether the solenoid, wiring, or control module needs replacement.

6. Related Codes

Need an OBD2 Scanner for the C1845? Compare the best scanners compatible with all vehicles
🛒 View OBD2 Scanners →