AutoCodes – Dodge – P2203 Dodge

P2203 Dodge Code - NOx Sensor Circuit High Bank 1

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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: P2203 Dodge indicates NOx Sensor Circuit High Bank 1.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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 3,658

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 Jul 24, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2203 Dodge Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P2203 Dodge - NOx Sensor Circuit High Bank 1 - AutoCodes.com — P2203 Dodge Code - NOx Sensor Circuit High Bank 1

What does this mean?

What are the Possible Causes of the DTC P2203 Dodge?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P2203 Dodge?

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 P2203 Dodge 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 P2203 Dodge Code

1. What does the OBDII code P2203 mean on a Dodge vehicle?

P2203 indicates a high voltage issue in the NOx sensor circuit for Bank 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of the P2203 code in a Dodge?

Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and potential activation of limp mode.

3. What causes the P2203 code to appear?

The code can be triggered by a faulty NOx sensor, damaged wiring or connectors, a malfunctioning NOx sensor control module, or excessive soot buildup on the sensor.

4. Can I drive my Dodge with a P2203 code?

Driving is possible but not recommended, as it may lead to increased emissions, reduced performance, or further damage to the emissions system.

5. How do I diagnose the P2203 code on my Dodge?

Start by inspecting the NOx sensor and its wiring for damage or corrosion, checking the sensor's voltage with a scan tool, and verifying the functionality of the NOx control module.

6. How do I fix the P2203 code on a Dodge?

Repairs may include replacing a faulty NOx sensor, repairing or replacing damaged wiring, cleaning excessive soot from the sensor, or replacing the NOx control module if necessary.

7. How much does it cost to fix a P2203 code on a Dodge?

The cost varies depending on the repair, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor.

8. Can a dirty air filter cause the P2203 code on a Dodge?

While an air filter won’t directly cause P2203, restricted airflow can affect combustion and emissions, potentially contributing to NOx sensor issues.

9. Will clearing the code with a scan tool fix the P2203 issue on my Dodge?

Clearing the code may temporarily turn off the check engine light, but the root cause must be addressed to prevent the code from returning.

10. Is the P2203 code covered under warranty for Dodge vehicles?

It depends on your vehicle's warranty. Emissions-related components like the NOx sensor may be covered under the federally mandated emissions warranty. Check with your dealer.