Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car has a part that checks the air pressure inside the engine. This code means that the computer thinks this part is not working right because it is getting a weak signal.
The crankcase pressure sensor measures the pressure in the engine's crankcase and sends this information to the engine control module (ECM). A 'Circuit Low' code indicates the ECM is receiving a signal that is lower than expected.
The P2C34 code is triggered when the ECM detects a low voltage signal from the crankcase pressure sensor B. This sensor is responsible for monitoring the pressure within the crankcase to ensure it is within the specified range. A low signal can indicate a problem with the sensor itself, the wiring, or the ECM.
• Check Engine Light is on
• Poor engine performance
• Increased emissions
• Possible engine misfires
• Faulty crankcase pressure sensor B
• Open or shorted wiring in the sensor circuit
• Poor electrical connection at the sensor
• Faulty ECM
ECM: Engine Control Module, the computer that manages engine functions.
Crankcase: The part of the engine that houses the crankshaft.
• Use an OBD-II scanner to verify the code.
• Inspect the crankcase pressure sensor and its wiring for damage.
• Test the sensor's voltage and resistance.
• Check for proper grounding and connections.
• Replace the crankcase pressure sensor B if faulty.
• Repair or replace damaged wiring or connectors.
• Update or reprogram the ECM if needed.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Wrench set
$100 - $300
Moderate
• Ford F-150
• Chevrolet Silverado
• Dodge Ram 1500
• Regularly inspect engine sensors and wiring.
• Perform routine maintenance checks.
• Ensure proper engine oil levels and quality.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Regular maintenance can prevent such issues.
Check with the vehicle manufacturer for warranty coverage on engine sensors.
This code has been associated with issues in vehicles with high mileage or those that have not had regular maintenance.
Moderate – While the vehicle may still be drivable, it should be inspected soon to prevent further damage.
Driving with a malfunctioning engine sensor can lead to increased emissions and potential engine damage.
• Engine at operating temperature
• Vehicle in park or neutral
The crankcase pressure sensor is typically located on the engine block or cylinder head.
Q: Can I drive with a P2C34 code?
A: It's possible, but not recommended. Driving with this code can lead to engine performance issues and increased emissions.
Q: How do I clear a P2C34 code?
A: After fixing the issue, you can clear the code using an OBD-II scanner. However, if the problem persists, the code will return.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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Fitment Required · Vehicle-fitment part
Commonly relevant for misfire, ignition-efficiency, and some drivability-related repairs.
Misfire and ignition-related faults commonly involve spark plugs as part of the repair path.
Check the correct plug type, gap, and engine application for your vehicle.
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Fitment Required · Vehicle-fitment part
Relevant when the fault points toward ignition-coil performance or cylinder-specific ignition issues.
Some ignition faults involve coil performance or cylinder-specific coil problems.
Match the coil to your engine and confirm the failed component before ordering.
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.