P0068 2017 GMC Sierra Code - Throttle Body Air Flow Performance
Quick Answer
The Engine Control Module (ECM) compares actual air flow based on Throttle Position (TP) to a calculated air flow based on the Manifold Absolute Pressure (MAP) sensor, and Mass Air Flow (MAF). Common causes include Air leak between the Mass Air Flow (MAF) sensor and Throttle Body, Restricted Air Filter, Dirty Throttle Body. 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
- P0068 2017 GMC Sierra indicates Throttle Body Air Flow Performance.
- Common causes
- Common causes include Air leak between the Mass Air Flow (MAF) sensor and Throttle Body, Restricted Air Filter, Dirty Throttle Body.
- 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 P0068 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0068 2017 GMC Sierra?
- Air leak between the Mass Air Flow (MAF) sensor and Throttle Body
- Restricted Air Filter
- Dirty Throttle Body
- Dirty Mass Air Flow sensor
- Faulty Mass Air Flow sensor
- Faulty Manifold Absolute Pressure (MAP)
- Faulty Throttle Body
How to Fix the DTC P0068 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0068 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.
Need more information about the P0068 2017 GMC Sierra code?
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Frequently Asked Questions about P0068 2017 GMC Sierra Code
1. What does the OBDII code P0068 mean on a 2017 GMC Sierra?
P0068 indicates a discrepancy between the throttle body airflow and the readings from the Manifold Absolute Pressure (MAP) sensor and Mass Air Flow (MAF) sensor.
2. What are the common symptoms of code P0068 in a 2017 GMC Sierra?
Symptoms include poor engine performance, rough idling, decreased fuel efficiency, hesitation during acceleration, and the Check Engine Light turning on.
3. What causes the P0068 code to appear in a 2017 GMC Sierra?
Common causes include a dirty or faulty throttle body, a malfunctioning MAP or MAF sensor, vacuum leaks, wiring issues, or a problem with the powertrain control module (PCM).
4. Can a dirty throttle body cause code P0068 on my 2017 GMC Sierra?
Yes, a dirty or carbon-clogged throttle body can cause inaccurate airflow readings, triggering the P0068 code.
5. How do I fix the P0068 code on a 2017 GMC Sierra?
Start by cleaning the throttle body, checking for vacuum leaks, and inspecting the MAP and MAF sensors. Replace any faulty components as needed. If the issue persists, the PCM may require reprogramming or replacement.
6. Can I drive my 2017 GMC Sierra with the P0068 code active?
While it may be possible to drive, it’s not advisable as the code can lead to poor performance, reduced fuel efficiency, and potential engine damage if ignored.
7. How can I diagnose the P0068 code on a 2017 GMC Sierra?
Use an OBDII scanner to confirm the code, then inspect the throttle body, MAP and MAF sensors, and their wiring for faults. Check for vacuum leaks and perform a live data analysis to compare sensor readings.
8. Do I need to replace the throttle body to fix code P0068 on my 2017 GMC Sierra?
Not necessarily. First, try cleaning the throttle body and inspecting related components. Replace it only if it’s confirmed to be faulty.
9. Can a faulty MAP or MAF sensor trigger the P0068 code in a 2017 GMC Sierra?
Yes, a malfunctioning MAP or MAF sensor can provide incorrect data to the PCM, leading to airflow discrepancies and triggering the P0068 code.
10. Will clearing the P0068 code with a scanner fix the issue on a 2017 GMC Sierra?
Clearing the code will turn off the Check Engine Light temporarily, but if the underlying issue isn’t resolved, the code will likely return.
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