What Does P1520 Mean?
The PCM has detected an electrical malfunction in the intake manifold runner control circuit. This could be a short, open circuit, or excessive resistance preventing proper control of the variable intake system.
Common Causes
35%
Damaged or broken wiring to IMRC actuator or solenoid
30%
Faulty intake manifold runner control actuator coil
20%
Corroded or loose electrical connector at actuator
10%
Short to ground or power in control circuit wiring
5%
PCM driver circuit failure
Diagnostic Steps
1
Step 1: Inspect IMRC actuator/solenoid connector for corrosion, damage, or loose connection
2
Step 2: Disconnect actuator and measure resistance across solenoid coil terminals (compare to specs)
3
Step 3: Check for battery voltage at actuator connector with key on (power supply circuit)
4
Step 4: Test continuity and resistance of control wiring between PCM and actuator
5
Step 5: Check for shorts to ground or power in wiring harness using multimeter
Estimated Repair Cost
$150 - $700
Parts + labor, varies by vehicle and location
The PCM has detected an electrical malfunction in the intake manifold runner control circuit. This could be a short, open circuit, or excessive resistance preventing proper control of the variable intake system.
The most common cause of P1520 (Intake Manifold Runner Control Circuit Malfunction) is: Damaged or broken wiring to IMRC actuator or solenoid
Typical repair costs for P1520 range from $150 to $700, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will have reduced performance and fuel economy at certain engine speeds. Safe to drive but performance will be noticeably affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1520 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air Intake/Variable Intake System
Difficulty
Type
Manufacturer
Recommended Tools
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