What Does P1511 Mean?
The PCM has detected an electrical malfunction in the intake manifold changeover valve circuit. This valve controls airflow path or runner length in variable intake manifold systems to optimize engine performance across RPM ranges.
Common Causes
40%
Faulty intake manifold changeover valve solenoid or actuator
30%
Damaged wiring or corroded connectors in IMRC circuit
20%
Mechanical binding or carbon buildup preventing valve movement
10%
Failed PCM output driver circuit
Diagnostic Steps
1
Step 1: Inspect IMRC valve connector for damage, corrosion, or loose terminals
2
Step 2: Measure resistance of IMRC solenoid (typically 20-50 ohms, verify with service data)
3
Step 3: Check for battery voltage at solenoid connector with key on
4
Step 4: Manually actuate IMRC valve to verify it moves freely without binding
5
Step 5: Command valve operation with scan tool and listen/feel for valve actuation
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an electrical malfunction in the intake manifold changeover valve circuit. This valve controls airflow path or runner length in variable intake manifold systems to optimize engine performance across RPM ranges.
The most common cause of P1511 (Intake Manifold Changeover Valve circuit electrical malfunction) is: Faulty intake manifold changeover valve solenoid or actuator
Typical repair costs for P1511 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle remains safe to drive. May experience reduced power or fuel economy, particularly at specific RPM ranges.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1511 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Intake Manifold System
Difficulty
Type
Manufacturer
Recommended Tools
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