What Does P1574 Mean?
The active engine mount solenoid valve on the left side has an electrical fault in its control circuit. Active engine mounts use electronically controlled hydraulic valves to reduce engine vibration by adjusting mount stiffness.
Common Causes
40%
Failed engine mount solenoid coil with open or high resistance
30%
Damaged wiring or connectors in solenoid circuit
15%
Corroded or loose connector at engine mount solenoid
10%
Water intrusion or contamination in solenoid connector
5%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Inspect left engine mount solenoid connector for corrosion, damage, or moisture
2
Step 2: Check solenoid coil resistance with multimeter - typical range is 10-50 ohms (verify manufacturer specs)
3
Step 3: Test for power and ground at solenoid connector with key on
4
Step 4: Use scan tool to command solenoid on/off and listen for clicking sound indicating operation
5
Step 5: Check wiring harness continuity and insulation resistance between solenoid and PCM
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The active engine mount solenoid valve on the left side has an electrical fault in its control circuit. Active engine mounts use electronically controlled hydraulic valves to reduce engine vibration by adjusting mount stiffness.
The most common cause of P1574 (Left Eng. Mount Solenoid Valve Electrical fault in circuit) is: Failed engine mount solenoid coil with open or high resistance
Typical repair costs for P1574 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive but may experience increased engine vibration at idle and during acceleration. No mechanical safety concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1574 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Mount System
Difficulty
Type
Manufacturer
Recommended Tools
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