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 sensor that measures the pressure in the exhaust system is reporting a value that is too low.
The P047C code indicates that the signal from the exhaust pressure sensor B is lower than the expected range set by the manufacturer.
The Exhaust Pressure Sensor B is responsible for monitoring the pressure within the exhaust system. When the sensor sends a signal that is lower than the predetermined threshold, the Engine Control Module (ECM) triggers the P047C code. This can affect the vehicle's emission control and performance.
• Check Engine Light is on
• Decreased engine performance
• Poor fuel economy
• Faulty exhaust pressure sensor
• Wiring issues such as short circuits or open circuits
• Faulty ECM
ECM: Engine Control Module
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage.
• Test the exhaust pressure sensor for proper operation.
• Replace the exhaust pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the ECM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Ford F-250
• Chevrolet Silverado
• Dodge Ram
• Regular maintenance and inspection of the exhaust system.
• Ensure wiring and connectors are in good condition.
• Use high-quality fuel to prevent sensor clogging.
Sensor Issue
• Do not ignore the Check Engine Light.
• Have the vehicle inspected by a professional if unsure.
• Address the issue promptly to avoid further damage.
Check with the vehicle manufacturer for warranty coverage on emissions-related components.
This code is relatively common in diesel engines with advanced emission controls.
Moderate – Should be addressed soon to prevent performance issues.
Driving with a faulty exhaust pressure sensor can lead to increased emissions and may not comply with local emissions regulations.
• Engine running at operating temperature.
• Vehicle stationary or during a road test.
The exhaust pressure sensor is typically located near the exhaust manifold or turbocharger.
Q: Can I drive with a P047C code?
A: While the vehicle may still be drivable, it is recommended to address the issue to prevent potential performance and emissions problems.
Q: How can I reset the Check Engine Light after fixing the issue?
A: You can use an OBD-II scanner to clear the code, or the light may turn off automatically after several drive cycles if the issue is resolved.
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