What Does C1772 Mean?
The air suspension vent solenoid output circuit is shorted to battery voltage. The control module detects unexpected high voltage on the solenoid control wire. The vent solenoid may be continuously energized or the module driver may be damaged.
Common Causes
35%
Solenoid control wire chafed against a power feed wire
25%
Connector cross-pin short between power and control pins
20%
Aftermarket wiring modification creating a power short
20%
Internal short in the solenoid coil to the power supply pin
Diagnostic Steps
1
Step 1: Disconnect the vent solenoid and check for battery voltage on the control wire from the harness side.
2
Step 2: Disconnect at the module and test the harness for a short between the control wire and any power wire.
3
Step 3: Inspect the harness for chafing or heat damage, especially near the compressor area.
4
Step 4: Test the solenoid internally for shorts between pins.
5
Step 5: Repair the short, clear codes, and verify normal vent operation.
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The air suspension vent solenoid output circuit is shorted to battery voltage. The control module detects unexpected high voltage on the solenoid control wire. The vent solenoid may be continuously energized or the module driver may be damaged.
The most common cause of C1772 (Air Suspension Vent Solenoid Output Circuit Short To Battery) is: Solenoid control wire chafed against a power feed wire
Typical repair costs for C1772 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vent solenoid may be stuck open causing the vehicle to lower uncontrollably, or the module may shut down suspension control. Use caution and repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1772 to identify the root cause.
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Quick Info
Category
Chassis
System
Air Suspension System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
