What Does P1538 Mean?
The intake manifold runner control valve or flap on bank 2 is stuck in the open position. This affects engine performance by not allowing proper airflow management at different RPM ranges.
Common Causes
45%
Failed or seized intake manifold runner control actuator/motor
30%
Carbon buildup causing mechanical binding of runner flaps
15%
Broken linkage or disconnected vacuum lines to runner control
10%
Faulty IMRC position sensor or wiring harness issues
Diagnostic Steps
1
Step 1: Perform visual inspection of intake manifold runner control actuator and linkage for damage or disconnection
2
Step 2: Use scan tool to command IMRC actuator operation and observe if valve moves freely
3
Step 3: Check actuator motor resistance and voltage supply at connector
4
Step 4: Remove intake manifold if necessary to inspect for carbon buildup or mechanical binding
5
Step 5: Test IMRC position sensor signal voltage throughout range of motion
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The intake manifold runner control valve or flap on bank 2 is stuck in the open position. This affects engine performance by not allowing proper airflow management at different RPM ranges.
The most common cause of P1538 (Intake Manifold Runner Control (Bank 2) Stuck Open) is: Failed or seized intake manifold runner control actuator/motor
Typical repair costs for P1538 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 reduced power and fuel economy. Performance at different RPM ranges will be compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1538 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 Air Intake
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
