AutoCodes – Generic – P20E1

P20E1 Code - Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

Quick Answer

The exhaust fuel addition injector assembly is mounted on the outlet of the turbocharger sub-assembly, and low-pressure fuel is supplied to the exhaust fuel addition injector assembly by the feed pump in the supply pump assembly. Common causes include Faulty Exhaust Aftertreatment Fuel Pressure Sensor, Exhaust Aftertreatment Fuel Pressure Sensor harness is open or shorted, Exhaust Aftertreatment Fuel Pressure Sensor 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: P20E1 indicates Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic.
Common causes: Common causes include Faulty Exhaust Aftertreatment Fuel Pressure Sensor, Exhaust Aftertreatment Fuel Pressure Sensor harness is open or shorted, Exhaust Aftertreatment Fuel Pressure Sensor 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 6,109

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20E1 Description

The exhaust fuel addition injector assembly is mounted on the outlet of the turbocharger sub-assembly, and low-pressure fuel is supplied to the exhaust fuel addition injector assembly by the feed pump in the supply pump assembly. The exhaust fuel addition injector assembly adds fuel by a control signal from the Engine Control Module (ECM). This injector is used for two different controls: Particulate Matter (PM) forced regeneration and PM reduction.

OBDII Code P20E1 - Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic - AutoCodes.com — P20E1 Code - Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

What does this mean?

What are the Possible Causes of the DTC P20E1?

Faulty Exhaust Aftertreatment Fuel Pressure Sensor
Exhaust Aftertreatment Fuel Pressure Sensor harness is open or shorted
Exhaust Aftertreatment Fuel Pressure Sensor circuit poor electrical connection

How to Fix the DTC P20E1?

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 P20E1 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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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.

Frequently Asked Questions about P20E1 Code

1. What does the OBDII code P20E1 mean?

Code P20E1 indicates an issue with the Exhaust Aftertreatment Fuel Pressure Sensor Circuit, specifically an intermittent or erratic signal, which can affect the diesel exhaust aftertreatment system.

2. What are the common symptoms of code P20E1?

Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, and potential failure of the diesel exhaust aftertreatment system.

3. What causes the P20E1 code to occur?

Common causes include a faulty exhaust aftertreatment fuel pressure sensor, damaged or corroded wiring, loose electrical connections, or a malfunctioning ECM (engine control module).

4. Can I drive with the P20E1 code?

Driving with the P20E1 code is not recommended, as it can lead to reduced engine performance and potential damage to the exhaust aftertreatment system over time.

5. How is the P20E1 code diagnosed?

A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the fuel pressure sensor for proper operation.

6. How do I fix the P20E1 code?

Repairs may include replacing the faulty fuel pressure sensor, repairing damaged wiring or connectors, or reprogramming/updating the ECM software if necessary.

7. How much does it cost to fix the P20E1 code?

Repair costs can vary but typically range from $150 to $500 depending on the specific cause and labor rates in your area.

8. Can a dirty or clogged exhaust system cause the P20E1 code?

While less common, a clogged exhaust system can increase pressure and potentially interfere with sensor readings, contributing to the code.

9. Does the P20E1 code affect emissions?

Yes, this code can impact emissions by disrupting the proper operation of the exhaust aftertreatment system, potentially causing the vehicle to fail emissions tests.

10. How can I prevent the P20E1 code from occurring?

Regular maintenance, including inspecting wiring and sensors, using high-quality diesel fuel, and addressing exhaust system issues promptly, can help prevent this code.