P22A2 Code - NOx Sensor Circuit Intermittent 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
- P22A2 indicates NOx Sensor Circuit Intermittent 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 P22A2 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 P22A2?
- 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 P22A2?
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 P22A2 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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Information for Specific Makes
- P22A2 Chevrolet — NOx Sensor Circuit Intermittent Bank 2
- P22A2 GMC — NOx Sensor Circuit Intermittent Bank 2
Frequently Asked Questions about P22A2 Code
1. What are common symptoms of the OBDII code P22A2 (NOx Sensor Circuit Intermittent Bank 2)?
Common symptoms include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.
2. What can cause the OBDII code P22A2 to trigger?
The code P22A2 is typically triggered by a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.
3. How serious is the OBDII code P22A2 (NOx Sensor Circuit Intermittent Bank 2)?
While the code itself may not cause immediate harm to the vehicle, it can lead to increased emissions and reduced engine efficiency if left unresolved.
4. How can I diagnose the OBDII code P22A2?
Diagnosing the code P22A2 involves using a diagnostic scanner to read the code, checking the NOx sensor and its circuit for any visible damage, and testing the sensor's functionality.
5. What are some potential repair options for the OBDII code P22A2?
Repair options include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, and resetting the engine control module after making necessary repairs.
6. Can I drive my vehicle with the OBDII code P22A2?
It is generally not recommended to drive the vehicle with the code P22A2, as it can lead to increased emissions and potential engine performance issues.
7. How much does it typically cost to repair the OBDII code P22A2?
The cost of repairing the code P22A2 can vary depending on the extent of the damage and the specific repairs needed, but it may range from $200 to $500 or more.
8. How often does the OBDII code P22A2 occur in vehicles?
The occurrence of the code P22A2 can vary depending on the make and model of the vehicle, but it is a relatively common issue in vehicles equipped with NOx sensors.
9. Are there any preventive measures to avoid the OBDII code P22A2?
Regular maintenance, such as checking and replacing sensors as recommended by the manufacturer, can help prevent issues like the code P22A2 from occurring.
10. Can I reset the check engine light after resolving the OBDII code P22A2?
Yes, the check engine light can be reset using a diagnostic scanner after resolving the underlying issue causing the OBDII code P22A2.
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