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P0068 Pontiac Code - MAP/MAF - Throttle Position Correlation

Quick Answer

The P0068 diagnostic trouble code (DTC) for Pontiac vehicles relates to a correlation issue between the Manifold Absolute Pressure (MAP) sensor, Mass Air Flow (MAF) sensor, and the Throttle Position Sensor (TPS). Common causes include Faulty MAP sensor, Faulty MAF sensor, Faulty TPS. 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 Pontiac indicates MAP/MAF - Throttle Position Correlation.
Common causes
Common causes include Faulty MAP sensor, Faulty MAF sensor, Faulty TPS.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P0068 Pontiac Description

The P0068 diagnostic trouble code (DTC) for Pontiac vehicles relates to a correlation issue between the Manifold Absolute Pressure (MAP) sensor, Mass Air Flow (MAF) sensor, and the Throttle Position Sensor (TPS). The MAP sensor measures the pressure within the intake manifold, while the MAF sensor measures the amount of air entering the engine. The TPS, on the other hand, monitors the position of the throttle valve. When these three sensors do not provide consistent readings, the Engine Control Module (ECM) detects a correlation problem, triggering the P0068 code.

OBDII Code P0068 Pontiac - MAP/MAF - Throttle Position Correlation
P0068 Pontiac Code - MAP/MAF - Throttle Position Correlation

Common Causes of P0068 Pontiac

  1. Faulty MAP sensor
  2. Faulty MAF sensor
  3. Faulty TPS
  4. Wiring or connection issues
  5. Vacuum leaks

Symptoms of P0068 Pontiac

  1. Reduced fuel efficiency
  2. Rough idling or stalling
  3. Hesitation or lack of power during acceleration
  4. Engine misfires
  5. Check Engine Light illuminated

How to Fix P0068 Pontiac

  1. Begin by inspecting the MAP, MAF, and TPS sensors for any signs of damage or wear. Replace any sensor that shows visible issues.
  2. Check the wiring and connections to ensure there are no loose connections or frayed wires. Repair or replace any damaged wiring.
  3. Inspect the intake system for vacuum leaks. Use a smoke machine or a can of carburetor cleaner to identify any leaks and address them accordingly.
  4. Clean the throttle body and replace the air filter if necessary to ensure proper airflow into the engine.
  5. Clear the fault codes using a scan tool and perform a test drive to confirm that the issue has been resolved.

Cost to Fix P0068 Pontiac

The cost of repairing a P0068 MAP/MAF - Throttle Position Correlation issue can vary depending on the specific cause of the problem and the labor rates in your area. In general, replacing a sensor can cost between $50 to $200, while addressing wiring or connection issues may range from $100 to $300. Vacuum leak repairs can also vary in cost, depending on the extent of the damage. Overall, the total repair cost for this issue could range from $150 to $600, including parts and labor. It's recommended to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

When is the Code Detected?

If the PCM detects that the difference between the actual air flow (MAF) and the speed density calculated air flow is greater than expected, DTC P0068 sets.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0068 Pontiac Code

1. What does the OBDII code P0068 on my Pontiac mean?

The P0068 code indicates a potential issue with the correlation between the MAP (Manifold Absolute Pressure) sensor, MAF (Mass Air Flow) sensor, and throttle position sensor.

2. What are the common symptoms of a P0068 code in a Pontiac?

Common symptoms include poor engine performance, rough idling, stalling, reduced fuel efficiency, and potential hesitation during acceleration.

3. What are the possible causes of a P0068 code in a Pontiac?

Potential causes include a faulty MAP sensor, MAF sensor, throttle position sensor, wiring issues, vacuum leaks, or a problem with the engine's air intake system.

4. How can I diagnose a P0068 code on my Pontiac?

Diagnosis typically involves using an OBDII scanner to read the code, conducting a visual inspection of the sensors and related components, checking for any visible damage or loose connections, and testing sensor functionality.

5. How can I repair a P0068 code in my Pontiac?

Repair steps may involve replacing the faulty MAP sensor, MAF sensor, or throttle position sensor, repairing any damaged wiring, fixing vacuum leaks, and ensuring proper connections in the intake system.

6. Can a P0068 code be safely driven with in my Pontiac?

Continuing to drive with a P0068 code may lead to further engine issues and potentially worsen fuel efficiency. It is recommended to address the problem promptly to prevent any long-term damage.

7. Will resetting the P0068 code on my Pontiac make it go away permanently?

Simply resetting the code may temporarily clear the check engine light, but the underlying issue causing the P0068 code will persist unless properly diagnosed and repaired.

8. Are there any maintenance tips to prevent a P0068 code in my Pontiac?

Regularly inspecting and maintaining the MAP sensor, MAF sensor, throttle position sensor, and intake system components can help prevent issues that may trigger a P0068 code.

9. Can a DIY enthusiast repair a P0068 code on a Pontiac?

Depending on your level of automotive expertise, you may be able to perform basic diagnostics and sensor replacements. However, complex issues or wiring problems may require professional assistance.

10. How much does it typically cost to repair a P0068 code in a Pontiac?

The cost of repairs for a P0068 code can vary based on the specific components needing replacement and labor costs. It is advisable to get estimates from local mechanics or dealerships for an accurate price range.

Discuss the causes and fixes for P0068 Pontiac OBDII Code

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  • 2007 Grand Prix GT SC 3.8...doesn't start, when does by pressing on gas as you start it, it will run very rough for about 10 secs then shows TC OFF/REDUCED ENGINE POWER & then SERVICE TRACTION SYSTEM & then stalls. Bought brand new MAF Sensor, Filter, Throttle Body, PCV Valve ad still the same. All started after replacing return hose for power steering, worked fine before that.

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  • Start by checking the Manifold Absolute Pressure (MAP) Sensor connector. If the connector is OK, then you may have to replace the sensor.

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