What Does P1578 Mean?
The right engine mount solenoid valve has a general electrical fault in its control circuit. This is a broader fault code that may indicate open circuit, high resistance, or other electrical anomaly not specifically a short.
Common Causes
40%
Failed engine mount solenoid with open coil winding
30%
Broken or corroded wiring causing open circuit or high resistance
20%
Poor connection at solenoid connector due to corrosion or looseness
7%
Water intrusion causing intermittent electrical fault
3%
PCM driver circuit failure or poor PCM ground
Diagnostic Steps
1
Step 1: Inspect right engine mount solenoid connector for looseness, corrosion, and proper pin contact
2
Step 2: Measure solenoid coil resistance - should be within specifications (typical 10-50 ohms), infinite resistance indicates open coil
3
Step 3: Check for power and ground at solenoid connector with key on and PCM commanding solenoid
4
Step 4: Test wiring continuity between PCM and solenoid connector in both power and ground circuits
5
Step 5: Monitor voltage drop across solenoid circuit during operation to identify high resistance connections
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The right engine mount solenoid valve has a general electrical fault in its control circuit. This is a broader fault code that may indicate open circuit, high resistance, or other electrical anomaly not specifically a short.
The most common cause of P1578 (Right Eng. Mount Solenoid Valve Electrical fault in circuit) is: Failed engine mount solenoid with open coil winding
Typical repair costs for P1578 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive with increased engine vibration. No immediate safety concern but comfort is compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1578 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Engine Mount System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
