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 thinks the oil pressure sensor isn't working right. It's like if a video game controller wasn't telling the game what you're doing correctly.
The P055B code indicates that the Engine Control Module (ECM) has detected an issue with the oil pressure sensor or switch B, which is not performing within the expected range.
The P055B code is triggered when the ECM detects that the oil pressure sensor/switch B is not operating within its normal range. This could be due to a faulty sensor, wiring issues, or incorrect oil pressure readings, which can affect engine performance.
• Illuminated check engine light
• Engine running rough or stalling
• Unusual engine noises
• Oil pressure warning light on
• Faulty oil pressure sensor/switch B
• Wiring issues or poor electrical connections
• Low engine oil level or pressure
• Defective oil pump
ECM: Engine Control Module
OBD-II: On-Board Diagnostics II
• Check the oil level and top up if necessary.
• Inspect the oil pressure sensor/switch and its wiring for damage.
• Test the oil pressure sensor/switch with a multimeter.
• Verify the actual oil pressure using a mechanical gauge.
• Replace the faulty oil pressure sensor/switch.
• Repair or replace damaged wiring or connectors.
• Change the engine oil and filter.
• Inspect and repair the oil pump if needed.
• Multimeter
• Oil pressure gauge
• Socket set
• Wrench set
$100 - $300
Moderate
• Chevrolet Silverado
• Ford F-150
• Toyota Camry
• Regularly check and maintain proper oil levels.
• Perform timely oil changes.
• Inspect and replace faulty sensors promptly.
Sensor Issue
• Do not ignore the check engine light.
• Have a professional inspect the vehicle if unsure.
• Regular maintenance can prevent such issues.
Check with your vehicle manufacturer for warranty coverage on sensors.
This code has been reported in vehicles with aging sensors or inadequate maintenance.
Moderate – Address the issue soon to prevent engine damage.
Driving with low oil pressure can cause severe engine damage. Address the issue promptly.
• Engine at operating temperature
• Vehicle parked on a level surface
The oil pressure sensor/switch is typically located near the oil filter or on the engine block.
Q: Can I drive with a P055B code?
A: It's not recommended to drive with this code, as it may indicate low oil pressure, which can damage the engine.
Q: How do I reset the check engine light after fixing the issue?
A: You can reset the light by using an OBD-II scanner or by disconnecting the battery for a few minutes.
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.