P0068 GMC 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 GMC 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 GMC Description
What are the Possible Causes of the DTC P0068 GMC?
- 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 GMC?
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 GMC 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 GMC code?
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Need Help with the Code?
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Information for Specific GMC Models
- P0068 2014 GMC Sierra — Throttle Body Air Flow Performance
- P0068 2015 GMC Sierra — Throttle Body Air Flow Performance
- P0068 2016 GMC Sierra — Throttle Body Air Flow Performance
- P0068 2017 GMC Sierra — Throttle Body Air Flow Performance
- P0068 2018 GMC Sierra — Throttle Body Air Flow Performance
Frequently Asked Questions about P0068 GMC Code
1. What does the OBDII code P0068 mean for GMC vehicles?
P0068 indicates a throttle body air flow performance issue, where there's a mismatch between the readings of the throttle position sensor (TPS) and the mass air flow (MAF) or manifold absolute pressure (MAP) sensors.
2. What are the common symptoms of P0068 in GMC vehicles?
Symptoms may include reduced engine performance, rough idling, stalling, hesitation during acceleration, and the check engine light turning on.
3. What causes the P0068 code on GMC vehicles?
Common causes include a dirty or faulty throttle body, a malfunctioning TPS, MAF, or MAP sensor, intake air leaks, or issues with the engine control module (ECM).
4. How serious is the P0068 code for GMC vehicles?
While the vehicle may still be drivable, prolonged operation with this code can lead to further engine damage or unsafe driving conditions due to stalling or reduced performance.
5. How can I diagnose the P0068 code on my GMC vehicle?
Start by inspecting the throttle body for dirt or damage, check the TPS, MAF, and MAP sensor for faults, and look for vacuum leaks or damaged wiring.
6. Can a dirty throttle body cause the P0068 code?
Yes, carbon buildup or dirt on the throttle body can restrict airflow and lead to a mismatch in sensor readings, triggering the code.
7. What tools are needed to troubleshoot the P0068 code on a GMC?
You'll need an OBDII scanner, multimeter for electrical tests, and basic tools to inspect and clean or replace components like the throttle body and sensors.
8. How do I fix the P0068 code on a GMC vehicle?
Fixes include cleaning or replacing the throttle body, repairing or replacing faulty sensors, sealing air intake leaks, and ensuring proper wiring connections.
9. Can a faulty MAF sensor trigger P0068 on a GMC?
Yes, a malfunctioning MAF sensor can send incorrect airflow readings to the ECM, leading to the P0068 code.
10. Should I reset the code after repairs for P0068 on a GMC?
Yes, after completing repairs, clear the code using an OBDII scanner and test drive the vehicle to confirm the issue has been resolved.
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