AutoCodes – Generic – P047A

P047A Code - Exhaust Pressure Sensor 'B' Circuit

Quick Answer

The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure. Common causes include Faulty Exhaust Back Pressure Sensor 'B', Exhaust Back Pressure Sensor 'B' harness is open or shorted, Exhaust Back Pressure Sensor 'B' circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P047A indicates Exhaust Pressure Sensor 'B' Circuit.
Common causes: Common causes include Faulty Exhaust Back Pressure Sensor 'B', Exhaust Back Pressure Sensor 'B' harness is open or shorted, Exhaust Back Pressure Sensor 'B' circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 7,764

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P047A Description

The Exhaust Back Pressure (EBP) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the Engine Control Module (ECM), produces a linear analog voltage signal that indicates pressure.
The EBP sensor's primary function is to measure exhaust back pressure so that the ECM can control the exhaust back pressure regulator (EPR) when needed.

OBDII Code P047A - Exhaust Pressure Sensor 'B' Circuit - AutoCodes.com — P047A Code - Exhaust Pressure Sensor 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P047A?

Faulty Exhaust Back Pressure Sensor 'B'
Exhaust Back Pressure Sensor 'B' harness is open or shorted
Exhaust Back Pressure Sensor 'B' circuit poor electrical connection

How to Fix the DTC P047A?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P047A code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P047A Audi — Exhaust Pressure Sensor 'B' Circuit
P047A Dodge — Exhaust Pressure Sensor 'B' Circuit
P047A Ford — Exhaust Pressure Sensor 'B' Circuit
P047A Mercedes-Benz — Exhaust Pressure Sensor 'B' Circuit
P047A Volkswagen — Exhaust Pressure Sensor 'B' Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.