P22A2 GMC 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 GMC 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 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 P22A2 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 P22A2 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 P22A2 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.
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Frequently Asked Questions about P22A2 GMC Code
1. What are the common symptoms of OBDII code P22A2 GMC (NOx Sensor Circuit Intermittent Bank 2)?
- Common symptoms include reduced engine performance, increased fuel consumption, and the illumination of the check engine light.
2. What can cause the OBDII code P22A2 GMC to trigger?
- The code P22A2 GMC can be triggered by issues such as a faulty NOx sensor, wiring harness problems, or a poor electrical connection.
3. How serious is the OBDII code P22A2 GMC (NOx Sensor Circuit Intermittent Bank 2)?
- While the vehicle may still be driveable with this code, it is important to address it promptly to prevent potential damage to the engine and ensure optimal emissions control.
4. What are some DIY repair tips for OBDII code P22A2 GMC?
- DIY repair tips include checking the wiring harness for signs of damage, ensuring proper sensor connections, and clearing the code to see if it reoccurs.
5. Can driving with the OBDII code P22A2 GMC (NOx Sensor Circuit Intermittent Bank 2) cause further damage?
- Continuing to drive with this code may lead to decreased fuel efficiency, increased emissions, and potential long-term engine damage if left unresolved.
6. How can I diagnose the OBDII code P22A2 GMC related to the NOx sensor?
- Diagnosing this code involves using a diagnostic scanner to read the code, inspecting the NOx sensor and related components, and testing the circuitry for faults.
7. Is it safe to ignore the OBDII code P22A2 GMC (NOx Sensor Circuit Intermittent Bank 2)?
- Ignoring this code can result in poor engine performance, failed emissions tests, and potential harm to the environment, so it is not recommended to ignore it.
8. What is the typical cost to repair the OBDII code P22A2 GMC?
- The cost to repair this code can vary depending on the exact cause, but it may range from a few hundred to a thousand dollars, including parts and labor.
9. Are there any recalls related to the OBDII code P22A2 GMC (NOx Sensor Circuit Intermittent Bank 2)?
- It is recommended to check with the manufacturer or authorized dealerships for any recalls or service bulletins related to this specific OBDII code.
10. How long does it take to repair the OBDII code P22A2 GMC?
- The repair time for this code can vary based on the complexity of the issue and the availability of parts, but it may typically take a few hours to a day to resolve.
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