P1133 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code
What does the OBDII code P1133 mean for a 2016 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 P1133 in a 2016 GMC Sierra?
Symptoms may include poor fuel economy, rough idle, reduced engine performance, and the check engine light being illuminated.
What causes the P1133 code in a 2016 GMC Sierra?
Common causes include a failing Bank 1 Sensor 1 oxygen sensor, exhaust leaks, wiring issues, or engine problems affecting the air-fuel ratio.
How do you diagnose the P1133 code in a 2016 GMC Sierra?
Start by inspecting the oxygen sensor wiring for damage, checking for exhaust leaks, and confirming proper fuel delivery and air intake systems.
Can a dirty or damaged oxygen sensor cause P1133?
Yes, a dirty or malfunctioning Bank 1 Sensor 1 oxygen sensor can cause insufficient switching and trigger the P1133 code.
Can an exhaust leak cause the P1133 code?
Yes, an exhaust leak near the Bank 1 Sensor 1 can disrupt oxygen sensor readings, leading to the P1133 code.
How do you fix the P1133 code in a 2016 GMC Sierra?
Repairs may include replacing the Bank 1 Sensor 1 oxygen sensor, fixing exhaust leaks, repairing damaged wiring, or addressing air-fuel mixture issues.
Is the P1133 code urgent to fix on a 2016 GMC Sierra?
While it may not immediately harm the engine, ignoring P1133 can lead to poor performance, increased emissions, and potential damage over time.
Can a bad catalytic converter cause the P1133 code?
While rare, a failing catalytic converter can indirectly affect oxygen sensor readings and trigger the P1133 code.
Does the P1133 code affect fuel efficiency?
Yes, the P1133 code can lead to inefficient fuel combustion, resulting in lower fuel economy.
Discuss the causes and fixes for P1133 2016 GMC Sierra OBDII Code
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