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 getting a steady reading from a sensor that checks the pressure of air going into the turbocharger. It's like trying to read a book with pages that keep flipping by themselves.
The P2378 code is triggered when the Engine Control Module (ECM) detects an intermittent or erratic signal from the turbocharger or supercharger inlet pressure sensor B.
The turbocharger/supercharger inlet pressure sensor B is responsible for monitoring the pressure of the air entering the turbocharger or supercharger. If the sensor signal is inconsistent or erratic, it can cause the ECM to log the P2378 code. This can affect the performance of the turbocharger or supercharger, leading to reduced engine efficiency or power.
• Check Engine Light is on
• Reduced engine performance
• Poor acceleration
• Faulty turbocharger/supercharger inlet pressure sensor B
• Wiring issues such as damaged or corroded connectors
• Intermittent electrical connection or short circuit
Turbocharger: A device that increases an engine's efficiency and power output by forcing extra air into the combustion chamber.
Supercharger: A device that increases the pressure of air entering the engine, similar to a turbocharger but driven by the engine itself.
• Use an OBD-II scanner to confirm the code
• Inspect the wiring and connectors for damage or corrosion
• Test the sensor for proper operation
• Replace the faulty pressure sensor
• Repair or replace damaged wiring or connectors
• Clear the code and test drive the vehicle to ensure the issue is resolved
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram
• Regularly inspect and maintain sensor connections
• Ensure proper maintenance of the turbocharger system
• Use quality replacement parts
Sensor Issue
• Do not ignore the Check Engine Light; address the issue promptly.
• Consult a professional mechanic if unsure about the repair process.
Check with the vehicle manufacturer for warranty coverage on sensor-related issues.
This code has been associated with issues in turbocharged vehicles where sensor reliability is crucial for performance.
Moderate – While it may not cause immediate damage, it can lead to reduced performance and should be addressed soon.
Driving with a malfunctioning sensor can lead to reduced engine performance and may not comply with emissions regulations.
• Engine at operating temperature
• Vehicle at idle
The turbocharger/supercharger inlet pressure sensor is typically located near the intake manifold or turbocharger housing.
Q: Can I drive with a P2378 code?
A: While the car may still be drivable, it's best to address the issue to avoid reduced performance and potential damage.
Q: How do I clear a P2378 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, the code may reappear.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.