Turbocharger Inlet Pressure Sensor Circuit High
The P012D code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the turbocharger/supercharger inlet pressure sensor, which is located downstream of the throttle valve. This sensor monitors the pressure in the intake manifold after the throttle plate. A high voltage reading typically means the sensor is reporting a pressure higher than expected, which can be caused by a faulty sensor, wiring issues, or a stuck throttle plate. This condition can lead to incorrect fuel delivery and boost control, potentially causing performance issues.
01. Most Common Causes
- Faulty turbocharger/supercharger inlet pressure sensor
- Short to voltage in sensor wiring or connector
- Corroded or damaged sensor connector
- Stuck or malfunctioning throttle plate
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Excessive black smoke from exhaust
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the sensor and wiring for damage, corrosion, or loose connections.
Step 3: Test the sensor voltage with a multimeter; compare to manufacturer specifications.
Step 4: Check the throttle plate operation and clean if necessary.
Step 5: If sensor is faulty, replace it and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced power and potential engine damage. Limp mode may limit speed, making highway driving unsafe.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a new sensor, plus labor if installed by a mechanic. DIY replacement can save on labor costs.