P0056 2017 GMC Sierra Code - HO2S Heater Control Circuit Bank 2 Sensor 2
Quick Answer
Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 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
- P0056 2017 GMC Sierra indicates HO2S Heater Control Circuit Bank 2 Sensor 2.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2, Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 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 P0056 2017 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects an open circuit in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.
What are the Possible Causes of the DTC P0056 2017 GMC Sierra?
- Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 2
- Heated Oxygen Sensor Bank 2 Sensor 2 harness is open shorted
- Heated Oxygen Sensor Bank 2 Sensor 2 circuit poor electrical connection
- Heated Oxygen Sensor Bank 2 Sensor 2 circuit fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0056 2017 GMC Sierra?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0056 2017 GMC Sierra 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 P0056 2017 GMC Sierra Code
1. What does the OBDII code P0056 mean on a 2017 GMC Sierra?
P0056 indicates an issue with the Heater Control Circuit for the Oxygen Sensor (HO2S) on Bank 2 Sensor 2.
2. What is Bank 2 Sensor 2 on my 2017 GMC Sierra?
Bank 2 refers to the side of the engine opposite the #1 cylinder, and Sensor 2 is the downstream oxygen sensor, located after the catalytic converter.
3. What are the common symptoms of the P0056 code?
Symptoms may include an illuminated Check Engine Light, poor fuel efficiency, or delayed closed-loop operation during engine warm-up.
4. What causes the P0056 code on a GMC Sierra?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning PCM (Powertrain Control Module).
5. Can I drive my 2017 GMC Sierra with the P0056 code?
While the vehicle may still be drivable, prolonged operation with this code can lead to increased emissions and potential damage to other components.
6. How do I diagnose the P0056 code?
Start by inspecting the wiring and connectors for the Bank 2 Sensor 2 oxygen sensor, check the sensor's resistance, and verify the circuit continuity.
7. How do I fix the P0056 code on my GMC Sierra?
Repairs may include replacing the oxygen sensor, repairing damaged wiring, replacing a blown fuse, or addressing PCM issues if necessary.
8. How much does it cost to fix the P0056 code?
Replacing the oxygen sensor typically costs $150-$300, while wiring repairs or PCM replacement may vary depending on labor and part costs.
9. Can a dirty or clogged catalytic converter cause the P0056 code?
No, the P0056 code specifically relates to the heater control circuit of the oxygen sensor and not the catalytic converter's efficiency.
10. How can I prevent the P0056 code from occurring again?
Regular maintenance, such as inspecting wiring and periodically checking the oxygen sensor's condition, can help prevent this issue.
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