AutoCodes – Chrysler – P20EE Chrysler

P20EE Chrysler 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 Chrysler 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 708

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 28, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20EE Chrysler 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 Chrysler - SCR NOx Catalyst Efficiency Below Threshold Bank 1 - AutoCodes.com — P20EE Chrysler Code - SCR NOx Catalyst Efficiency Below Threshold Bank 1

What does this mean?

What are the Possible Causes of the DTC P20EE Chrysler?

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

How to Fix the DTC P20EE Chrysler?

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 P20EE Chrysler 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 Chrysler Code

1. What are common symptoms of OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Common symptoms include a check engine light illuminated on the dashboard, reduced engine performance, and potential issues passing emissions tests.

2. What are the possible causes of OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- The code can be triggered by issues such as a faulty NOx sensor, a malfunctioning SCR catalyst, exhaust leaks, or contaminated DEF (diesel exhaust fluid).

3. How can I diagnose OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, checking the NOx sensor readings, inspecting the SCR catalyst, and examining the DEF quality.

4. Can I drive my vehicle with OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- It is not recommended to drive the vehicle for an extended period with this code as it may lead to reduced fuel efficiency, engine damage, or failure to meet emission standards.

5. How can I repair OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Repairs may involve replacing the NOx sensor, repairing exhaust leaks, cleaning or replacing the SCR catalyst, ensuring proper DEF quality, and clearing the code with an OBDII scanner.

6. Is it possible to reset OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1 without fixing the underlying issue?

- While you can clear the code temporarily with an OBDII scanner, it is crucial to address the root cause to prevent further damage and ensure the vehicle operates efficiently.

7. What are the long-term consequences of ignoring OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Ignoring the code can lead to increased emissions, potential damage to the engine or emission control components, and may result in the vehicle failing emission tests.

8. Are there any maintenance tips to prevent OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Regularly maintaining the exhaust system, using high-quality DEF, following the manufacturer's recommended service schedule, and addressing any warning lights promptly can help prevent this code.

9. Can weather conditions affect OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1?

- Extreme temperatures or adverse weather conditions can impact the performance of the SCR system and potentially trigger the code, so it's essential to monitor the system in varying conditions.

10. Is OBDII code P20EE (Chrysler) SCR NOx Catalyst Efficiency Below Threshold Bank 1 a common issue in certain Chrysler models?

- This code is more commonly reported in specific Chrysler models equipped with SCR systems, particularly in vehicles that have been driven for an extended period without proper maintenance.