P2BAC Code - NOx Exceedence - Deactivation of EGR
Quick Answer
The selective catalytic reduction system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of diesel exhaust fluid or reductant into the exhaust gas stream entering the diesel particulate filter (DPF). Common causes include Faulty NOx Sensors, NOx Sensors harness is open or shorted, NOx Sensors 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
- P2BAC indicates NOx Exceedence - Deactivation of EGR.
- Common causes
- Common causes include Faulty NOx Sensors, NOx Sensors harness is open or shorted, NOx Sensors 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 P2BAC Description
The ECM uses the 2 NOx sensors to control exhaust NOx levels. The NOx sensor measures the amount of NOx and oxygen in the exhaust system. The first NOx sensor is located at the outlet of the turbocharger and monitors the engine out NOx. The second NOx sensor is located in the DPF that monitors NOx levels exiting the DPF. The ECM varies the amount of reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
What are the Possible Causes of the DTC P2BAC?
- Faulty NOx Sensors
- NOx Sensors harness is open or shorted
- NOx Sensors circuit poor electrical connection
- Fualty Diesel Particulate Filter (DPF)
How to Fix the DTC P2BAC?
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 P2BAC 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 P2BAC code?
Need more information on how to fix the P2BAC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2BAC code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P2BAC Chevrolet — NOx Exceedence - Deactivation of EGR
- P2BAC Dodge — NOx Exceedence - Deactivation of EGR
- P2BAC GMC — NOx Exceedence - Deactivation of EGR
- P2BAC Toyota — NOx Emissions Exceeded Deactivation of EGR
Frequently Asked Questions about P2BAC Code
1. What does OBDII code P2BAC mean?
Code P2BAC indicates a NOx Exceedence - Deactivation of EGR, signaling that the nitrogen oxide levels are higher than acceptable due to the Exhaust Gas Recirculation (EGR) system deactivation.
2. What are some common symptoms of code P2BAC?
Common symptoms of code P2BAC may include decreased engine performance, rough idling, increased fuel consumption, and the illumination of the Check Engine Light.
3. What can cause the OBDII code P2BAC to trigger?
The OBDII code P2BAC can trigger due to issues such as a faulty EGR valve, clogged EGR passages, wiring or electrical problems in the EGR system, or issues with the NOx sensor.
4. How serious is the OBDII code P2BAC?
Code P2BAC should be addressed promptly as it can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time if left unresolved.
5. Can I continue driving with the OBDII code P2BAC active?
It is not recommended to continue driving with the code P2BAC active, as it can negatively affect the vehicle's performance and emissions. It is best to address the underlying issue as soon as possible.
6. How can I diagnose and repair OBDII code P2BAC?
Diagnosing and repairing code P2BAC typically involves inspecting the EGR system components, checking for clogs, testing the EGR valve operation, inspecting wiring and connectors, and testing the NOx sensor.
7. Is it possible to reset the OBDII code P2BAC without fixing the underlying issue?
Resetting the code without fixing the underlying issue will only temporarily turn off the Check Engine Light. The problem causing the code will persist, and the code is likely to reappear.
8. Can a DIY enthusiast fix the OBDII code P2BAC at home?
Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the OBDII code P2BAC at home. However, it is recommended to consult a professional mechanic for an accurate diagnosis and repair.
9. How much does it cost to repair the OBDII code P2BAC?
The cost of repairing code P2BAC can vary depending on the underlying issue, the need for parts replacement, and labor costs. It is advisable to obtain estimates from different repair shops.
10. How can I prevent OBDII code P2BAC from reoccurring?
To prevent the OBDII code P2BAC from reoccurring, it is crucial to perform regular maintenance on the EGR system, drive the vehicle responsibly, and address any related issues promptly to maintain optimal engine performance.
Discuss the causes and fixes for P2BAC OBDII Code
-
where the first and second nox sensors are located varies with models and manufacturer and is not at all dpf related
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
