AutoCodes – RAM – P20EE RAM

P20EE RAM Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

Quick Answer

The aftertreatment system is equipped with two Nox Sensors. Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst. 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: P20EE RAM indicates SCR NOx Catalyst Efficiency Below Threshold Bank 1.
Common causes: Common causes include Faulty NOx Sensor, Diesel Exhaust Fluid, Faulty Selective Catalyst Reduction (SCR) Catalyst.
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 3,273

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on May 09, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P20EE RAM Description

The aftertreatment system is equipped with two Nox Sensors. The upstream NOx Sensor 1/1 is located at the inlet elbow of the Diesel Exhaust Oxidation (DOC) Catalyst/Diesel Particulate Filter (DPF) and is permanently connected (via a permanent wiring harness) to the NOx Sensor 1/1 Module mounted toward the front frame rail at the rear of the right front wheel well. The downstream NOx Sensor 1/2 is located at the outlet of the Selective Catalytic Reduction (SCR) Catalyst and is permanently connected (via a permanent wiring harness) to the NOx Sensor Module 1/2 mounted along the left middle frame rail. The upstream NOx Sensor 1/1 measures the NOx concentration upstream of the Catalysts. The downstream NOx Sensor 1/2 measures the NOx concentration downstream of the Catalysts. The NOx Sensors also perform a heater strategy. The NOx Sensor module monitors the sensor temperature and operates a heater inside the NOx Sensor probe to maintain proper sensor operating temperature. The NOx Sensors are smart devices and communicate with the Powertrain Control Module (PCM) over designated Data Link circuits. The NOx Sensors perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the MIL lamp immediately after the monitor runs and fails.

OBDII Code P20EE RAM - SCR NOx Catalyst Efficiency Below Threshold Bank 1 - AutoCodes.com — P20EE RAM Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

What does this mean?

What are the Possible Causes of the DTC P20EE RAM?

Faulty NOx Sensor
Diesel Exhaust Fluid
Faulty Selective Catalyst Reduction (SCR) Catalyst

How to Fix the DTC P20EE RAM?

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 does this mean?

Code Tech Notes

For the 2011-2012 Ram 3500, 4500, and 5500 there is a factory service bulletin that recommends replacing the Selective Catalyst Reduction (SCR) Catalyst assembly if exhaust fluid leaks are found or there are no signs of DEF fluid contamination found

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P20EE RAM 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 P20EE RAM Code

What does the OBDII code P20EE mean?

The OBDII code P20EE indicates that the SCR (Selective Catalytic Reduction) NOx (Nitrogen Oxide) catalyst efficiency is below the acceptable threshold for Bank 1, suggesting that the catalyst may not be functioning properly.

What are the common symptoms associated with the P20EE code?

Common symptoms include increased emissions, reduced engine performance, a decrease in fuel efficiency, and the check engine light being illuminated on the dashboard.

What can cause the P20EE code to trigger?

The P20EE code can be triggered by a faulty NOx sensor, a malfunctioning SCR catalyst, clogged exhaust components, or issues with the DEF (Diesel Exhaust Fluid) system.

Can I drive my vehicle with the P20EE code?

While you can technically drive with the P20EE code, it is not advisable, as it can lead to increased emissions and potential damage to the exhaust system. It's best to have it diagnosed and repaired promptly.

How can I diagnose the P20EE code?

To diagnose the P20EE code, use an OBD-II scanner to read the trouble codes, inspect the SCR system, check the NOx sensors, and look for any leaks or blockages in the exhaust system.

What repairs are typically needed for the P20EE code?

Repairs may include replacing the NOx sensor, cleaning or replacing the SCR catalyst, fixing any leaks in the exhaust system, or addressing issues with the DEF system.

Is it expensive to fix the P20EE code?

The cost to fix the P20EE code can vary widely depending on the specific issue, but repairs involving the SCR system or catalyst can be costly, often ranging from a few hundred to several thousand dollars.

Can I reset the check engine light after fixing the P20EE code?

Yes, after addressing the underlying issue causing the P20EE code, you can reset the check engine light using an OBD-II scanner. It's recommended to clear the codes and perform a test drive to ensure the issue is resolved.

Will ignoring the P20EE code lead to further problems?

Yes, ignoring the P20EE code can lead to more severe engine issues, increased emissions fines, and potential damage to the SCR system, which may result in more expensive repairs down the line.