P0135 2018 GMC Sierra Code - HO2S Heater Performance Bank 1 Sensor 1
Quick Answer
Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0135 2018 GMC Sierra indicates HO2S Heater Performance Bank 1 Sensor 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0135 2018 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.
What are the Possible Causes of the DTC P0135 2018 GMC Sierra?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0135 2018 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 P0135 2018 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 P0135 2018 GMC Sierra Code
1. What does the OBDII code P0135 mean on a 2018 GMC Sierra?
P0135 indicates a problem with the heater circuit of the oxygen sensor (HO2S) in Bank 1, Sensor 1, meaning the sensor is not heating up properly to function efficiently.
2. What are the symptoms of code P0135 in a 2018 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, difficulty passing emissions tests, and possibly rough idling or poor engine performance.
3. What causes the P0135 code on a 2018 GMC Sierra?
Causes can include a blown fuse, damaged wiring or connectors, a faulty oxygen sensor, or a malfunctioning engine control module (ECM).
4. Where is Bank 1 Sensor 1 located on a 2018 GMC Sierra?
Bank 1 Sensor 1 is the oxygen sensor located upstream (before the catalytic converter) on the side of the engine with cylinder 1.
5. Can I drive my 2018 GMC Sierra with the P0135 code?
While it may still be drivable, ignoring the issue can lead to decreased fuel efficiency and potential damage to the catalytic converter over time.
6. How is the P0135 code diagnosed in a 2018 GMC Sierra?
A mechanic will typically use a scan tool to confirm the code, inspect the sensor wiring and connectors, check for blown fuses, and test the oxygen sensor’s resistance and voltage.
7. How do I fix the P0135 code on my 2018 GMC Sierra?
Common fixes include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, replacing blown fuses, or in rare cases, replacing the ECM.
8. How much does it cost to fix the P0135 code on a 2018 GMC Sierra?
The cost varies, but replacing an oxygen sensor generally ranges from $150 to $400, including parts and labor.
9. Can a dirty air filter cause the P0135 code in a 2018 GMC Sierra?
No, a dirty air filter is unlikely to cause this code, as P0135 specifically relates to the oxygen sensor’s heater circuit, not general airflow issues.
10. Will clearing the P0135 code fix the problem on my 2018 GMC Sierra?
Clearing the code may turn off the check engine light temporarily, but if the underlying issue isn’t resolved, the code will likely return.
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