Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is having trouble matching the engine's idle speed with what it should be. It's like when you try to keep a spinning top steady, but it wobbles instead.
The P152E code is triggered when the engine control module (ECM) detects a discrepancy between the actual and desired idle speed. This is monitored through the idle speed control valve.
The idle speed control valve is responsible for maintaining the engine's idle speed by adjusting the amount of air that bypasses the throttle plate. The ECM monitors the actual idle speed and compares it to the desired idle speed. If the two values do not match within a specified range, the P152E code is set.
• Engine stalls at idle
• Rough idle
• Check Engine Light is on
• Faulty idle speed control valve
• Vacuum leaks
• Dirty throttle body
ECM: Engine Control Module
Throttle Body: A component of the air intake system that controls the amount of air flowing into the engine
• Check for vacuum leaks around the intake manifold.
• Inspect and clean the throttle body.
• Test the idle speed control valve for proper operation.
• Replace the idle speed control valve if faulty.
• Repair any vacuum leaks.
• Clean the throttle body.
• OBD-II scanner
• Multimeter
• Throttle body cleaner
$150 - $400
Moderate
• BMW 3 Series
• Mercedes-Benz C-Class
• Audi A4
• Regularly clean the throttle body.
• Perform routine maintenance checks.
• Ensure vacuum hoses are intact and not leaking.
Engine Performance
• Avoid driving with a rough idle for extended periods.
• Seek professional diagnostic if unsure about repairs.
Check with your vehicle manufacturer for specific warranty coverage on engine components.
This code is commonly associated with vehicles that have electronically controlled throttle systems and can be triggered by a variety of issues related to idle speed control.
Moderate – The car may still be drivable, but performance issues should be addressed to prevent further damage.
Driving with a malfunctioning idle control system can lead to stalling, which may be dangerous in traffic. Address the issue promptly.
• Engine at operating temperature
• Vehicle in park or neutral
The idle speed control valve is typically located on or near the throttle body of the engine.
Q: Can I drive with a P152E code?
A: It's possible to drive with this code, but it's not recommended as it can lead to stalling and other performance issues.
Q: How do I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code after the repair, or the light may turn off automatically after several driving cycles.
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Fitment Required · Vehicle-fitment part
Relevant for airflow, fuel-trim, and intake-metering faults after confirming the sensor is actually at fault.
Airflow and fuel-trim codes can involve the mass air flow sensor after proper diagnosis.
Verify the sensor design and fitment for your exact vehicle.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.