AutoCodes – Generic – P229F

P229F Code - NOx Sensor Circuit Range/Performance Bank 2

Quick Answer

The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. Common causes include Faulty Nitrogen Oxide (NOx) Sensor Bank 2, Nitrogen Oxide (NOx) Sensor Bank 2 harness is open or shorted, Nitrogen Oxide (NOx) Sensor Bank 2 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: P229F indicates NOx Sensor Circuit Range/Performance Bank 2.
Common causes: Common causes include Faulty Nitrogen Oxide (NOx) Sensor Bank 2, Nitrogen Oxide (NOx) Sensor Bank 2 harness is open or shorted, Nitrogen Oxide (NOx) Sensor Bank 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 75,739

How popular is this code, among other codes? Medium

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 May 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P229F Description

The reductant system uses two Nitrogen Oxide (NOx) sensors to monitor the amount of NOx in the engine's exhaust gas. The first sensor is located at the outlet of the turbocharger and monitors the engine out NOx level. The second NOx sensor is located between the Selective Catalytic Reduction (SCR) and the Diesel Particulate Filter (DPF) and monitors NOx levels downstream of the SCR. The second NOx sensor also provides the Engine Control Module (ECM) with information on the exhaust oxygen level during DPF regeneration.
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 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 (DEF) or reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out 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.

OBDII Code P229F - NOx Sensor Circuit Range/Performance Bank 2 - AutoCodes.com — P229F Code - NOx Sensor Circuit Range/Performance Bank 2

What does this mean?

What are the Possible Causes of the DTC P229F?

Faulty Nitrogen Oxide (NOx) Sensor Bank 2
Nitrogen Oxide (NOx) Sensor Bank 2 harness is open or shorted
Nitrogen Oxide (NOx) Sensor Bank 2 circuit poor electrical connection

How to Fix the DTC P229F?

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 P229F 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.

Need more information about the P229F code?

Need more information on how to fix the P229F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P229F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P229F Chevrolet — NOx Sensor Circuit Range/Performance Bank 2
P229F Dodge — NOx Sensor Circuit Range/Performance Bank 2
P229F GMC — NOx Sensor Circuit Range/Performance Bank 2
P229F RAM — NOx Sensor Circuit Range/Performance Bank 2

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 P229F Code

1. What are the common symptoms of OBDII code P229F (NOx Sensor Circuit Range/Performance Bank 2)?

- The common symptoms include reduced engine performance, decreased fuel efficiency, illuminated Check Engine Light, and potential issues passing emissions tests.

2. What are the possible causes of OBDII code P229F?

- The code P229F can be triggered by a faulty NOx sensor, wiring or connector issues, a damaged sensor circuit, or issues with the Engine Control Module (ECM).

3. How can I diagnose the root cause of OBDII code P229F?

- To diagnose the issue, it is recommended to perform a thorough inspection of the NOx sensor, check the wiring and connectors for any damage, and use a diagnostic scan tool to analyze the sensor's performance.

4. Can driving with OBDII code P229F cause further damage to the vehicle?

- Continuing to drive with code P229F may lead to poor engine performance, reduced fuel efficiency, and potential damage to other engine components over time. It is advisable to address the issue promptly.

5. How can I repair OBDII code P229F (NOx Sensor Circuit Range/Performance Bank 2) myself?

- Repairing this code may involve replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or resetting the Engine Control Module. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Is it safe to drive my vehicle with the Check Engine Light on due to code P229F?

- While the vehicle may still be operable with the Check Engine Light on, it is advisable to have the issue diagnosed and repaired promptly to prevent potential long-term damage and ensure optimal vehicle performance.

7. Can a faulty NOx sensor cause code P229F to be triggered?

- Yes, a malfunctioning NOx sensor is a common cause of OBDII code P229F. If the sensor fails to accurately measure the NOx levels in the exhaust, the ECM may trigger this code.

8. How much does it typically cost to repair OBDII code P229F at a professional auto repair shop?

- The cost of repairing OBDII code P229F can vary depending on the root cause of the issue, the labor rates of the repair shop, and the cost of any necessary replacement parts. It is recommended to obtain quotes from multiple shops for an accurate estimate.

9. Can resetting the Check Engine Light resolve OBDII code P229F temporarily?

- Resetting the Check Engine Light may temporarily turn off the light, but it will not address the underlying issue causing code P229F. It is important to diagnose and repair the problem to prevent future occurrences.

10. How long does it typically take to repair OBDII code P229F?

- The repair time for code P229F can vary depending on the specific cause of the issue, the availability of replacement parts, and the expertise of the mechanic. In general, it may take a few hours to a day for diagnosis and repair.