What Does P1387 Mean?
The electrical circuit controlling the variable cam timing solenoid #1 has a malfunction. This indicates an open, short, or excessive resistance in the VVT solenoid circuit.
Common Causes
40%
Faulty VVT solenoid coil winding (open or shorted)
25%
Damaged wiring or connector at VVT solenoid
15%
PCM internal VVT driver circuit failure
12%
Corroded or loose connector terminals
8%
Short to ground or voltage in solenoid control circuit
Diagnostic Steps
1
Step 1: Disconnect VVT solenoid connector and measure resistance across solenoid terminals (typically 6-12 ohms)
2
Step 2: Inspect solenoid connector for corrosion, bent pins, or oil contamination
3
Step 3: Check for power and ground at solenoid connector with key on
4
Step 4: Use multimeter to test solenoid control circuit for shorts to ground or voltage
5
Step 5: Monitor PCM command signal with scan tool while testing circuit continuity to PCM
Estimated Repair Cost
$150 - $900
Parts + labor, varies by vehicle and location
The electrical circuit controlling the variable cam timing solenoid #1 has a malfunction. This indicates an open, short, or excessive resistance in the VVT solenoid circuit.
The most common cause of P1387 (Variable Cam Timing Solenoid #1 Circuit Malfunction) is: Faulty VVT solenoid coil winding (open or shorted)
Typical repair costs for P1387 range from $150 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Will cause reduced engine performance, poor fuel economy, and rough idle. Vehicle is generally safe to drive but should be repaired soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1387 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing System
Difficulty
Type
Manufacturer
Recommended Tools
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