Error code

OBD2 P0068

OBD2P0068
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

MAP/MAF - Throttle Position Correlation.

Severity

moderateThe vehicle can be driven but may experience performance issues.

Summary

P0068 indicates that there is an issue with the correlation between signals from the throttle position sensor (TPS), mass air flow (MAF) sensor, and manifold absolute pressure (MAP) sensor.

Symptoms

  • Reduced fuel efficiency
  • Decreased engine performance
  • Significant hesitation upon acceleration

Common Causes

  • Large vacuum leaks due to cracked or disconnected vacuum lines/hoses
  • Defective intake and throttle body gaskets
  • EGR valve and gasket malfunctions
  • Vacuum-operated component defects (brake boosters, etc.)
  • Faulty TPS, MAF, or MAP sensor

Diagnosis

  1. Retrieve and record all trouble codes using a scanner.
  2. Perform a visual inspection of the related components, connectors, and circuitry for damage or disconnection.
  3. Test live data at the sensor connector with a DVOM to check resistance values against manufacturer specifications.
  4. Disconnect electrical connectors from sensors and control modules before testing circuits for continuity and resistance.

Fixes

  • Replace faulty TPS, MAF, or MAP sensor as needed.

FAQ

What should I do if the code P0068 appears?

Start by checking for vacuum leaks and inspecting related sensors. Use a diagnostic tool to test live data and compare with manufacturer specifications.

Can this issue be fixed without professional help?

Yes, it can often be addressed by replacing faulty sensors or repairing vacuum lines/hoses, but thorough testing is recommended.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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