P1133 2017 GMC Sierra Code - HO2S Insufficient Switching Bank 1 Sensor 1
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 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
- P1133 2017 GMC Sierra indicates HO2S Insufficient Switching Bank 1 Sensor 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 1 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 P1133 2017 GMC Sierra Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor rich-to-lean counts or the lean-to-rich counts are less than a calibrated value greater than 100s.
What are the Possible Causes of the DTC P1133 2017 GMC Sierra?
- Faulty Heated Oxygen Sensor (HO2S) Bank 1 Sensor 1
- Heated Oxygen Sensor Bank 1 Sensor 1 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P1133 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 P1133 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 P1133 2017 GMC Sierra Code
What does the OBDII code P1133 mean for a 2017 GMC Sierra?
P1133 indicates "HO2S Insufficient Switching Bank 1 Sensor 1," meaning the upstream oxygen sensor in Bank 1 isn't switching between rich and lean as expected.
What are the symptoms of code P1133 in a 2017 GMC Sierra?
Common symptoms include a check engine light, reduced fuel efficiency, rough idling, and possible hesitation during acceleration.
What causes the P1133 code in a 2017 GMC Sierra?
Possible causes include a faulty oxygen sensor, wiring issues, exhaust leaks, or an engine running too rich or lean due to other problems.
How do you troubleshoot the P1133 code on a 2017 GMC Sierra?
Start by inspecting the oxygen sensor wiring for damage, checking for exhaust leaks, and verifying proper engine operation. A scan tool can help monitor sensor activity.
Can a bad O2 sensor cause the P1133 code in a 2017 GMC Sierra?
Yes, a failing or degraded upstream oxygen sensor (Bank 1 Sensor 1) is a common cause of this code.
How do you fix the P1133 code on a 2017 GMC Sierra?
Repairs may include replacing the oxygen sensor, fixing wiring issues, sealing exhaust leaks, or addressing fuel system problems.
Can the P1133 code affect drivability in a 2017 GMC Sierra?
Yes, it can lead to engine performance issues such as poor acceleration, reduced fuel efficiency, and rough idling.
Is it safe to drive a 2017 GMC Sierra with the P1133 code?
While the vehicle may still run, driving with this code can worsen fuel consumption and potentially damage the catalytic converter over time.
How can you prevent the P1133 code from occurring in a 2017 GMC Sierra?
Regular maintenance, including checking oxygen sensors, inspecting exhaust components, and ensuring the fuel system is functioning correctly, can help prevent this code.
Will replacing the oxygen sensor always fix the P1133 code in a 2017 GMC Sierra?
Not always; if the issue is caused by wiring damage, exhaust leaks, or engine performance problems, those must be addressed as well.
Discuss the causes and fixes for P1133 2017 GMC Sierra OBDII Code
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