P229E GMC Code - NOx Sensor Circuit 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
- P229E GMC indicates NOx Sensor Circuit 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.
Code P229E GMC Description
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.
What are the Possible Causes of the DTC P229E GMC?
- 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 P229E GMC?
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 P229E GMC 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 P229E GMC code?
Need more information on how to fix the P229E GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P229E GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P229E GMC Code
1. What are the common symptoms of OBDII code P229E GMC (NOx Sensor Circuit Bank 2)?
The common symptoms of code P229E include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.
2. What causes OBDII code P229E GMC to trigger?
Code P229E is typically triggered by a faulty NOx sensor, damaged wiring or connectors in the NOx sensor circuit, or issues with the engine control module (ECM).
3. How can I diagnose the cause of OBDII code P229E GMC?
Diagnosing code P229E involves using an OBDII scanner to retrieve the code and then inspecting the NOx sensor, wiring, and connectors for any signs of damage or malfunction.
4. Can I continue driving my vehicle with OBDII code P229E GMC?
It is not recommended to drive your vehicle with code P229E unresolved, as it can lead to further damage and potentially affect the overall performance of your vehicle.
5. How can I repair OBDII code P229E GMC?
Repairing code P229E typically involves replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, and clearing the code with an OBDII scanner.
6. Are there any DIY tips for fixing OBDII code P229E GMC?
While some basic troubleshooting steps can be taken, it is recommended to consult a professional mechanic for an accurate diagnosis and repair of code P229E to ensure proper functioning of the NOx sensor circuit.
7. How much does it cost to repair OBDII code P229E GMC?
The cost of repairing code P229E can vary depending on the extent of the damage and the specific components that need to be replaced. It is advisable to obtain quotes from different repair shops for an accurate estimate.
8. Can a faulty NOx sensor cause other issues in the vehicle?
Yes, a faulty NOx sensor can cause a decrease in engine performance, reduced fuel efficiency, and potentially lead to increased emissions, affecting the overall drivability of the vehicle.
9. How long does it take to repair OBDII code P229E GMC?
The repair time for code P229E can vary depending on the availability of parts, the complexity of the repair, and the mechanic's expertise. It is advisable to consult with a professional for a more accurate time frame.
10. Is OBDII code P229E GMC a common issue in GMC vehicles?
While not extremely common, OBDII code P229E related to the NOx sensor circuit can occur in GMC vehicles, particularly in models equipped with NOx sensors for emissions control.
Discuss the causes and fixes for P229E GMC OBDII Code
Code P229E GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
