P0068 Code: MAP/MAF – Throttle Correlation — Causes & Fix
P0068 means the ECM sees a mismatch between the air-flow (MAF/MAP) reading and the throttle position — the airflow doesn't match how far the throttle is open.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $30 – $400
- Time to fix
- 30 minutes – 2 hours
What it means
Causes include a large vacuum/intake leak, a dirty MAF, a MAP/throttle sensor fault, or a stuck throttle plate. P0068 is a generic OBD-II powertrain code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer petrol car or light truck regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Rough idle, surging, or stalling
- Reduced power / limp mode
How to fix it
- 1
Find intake/vacuum leaks
1. Inspect the intake boot and vacuum lines for leaks. 2. Clean the MAF sensor.
- 2
Verify throttle and sensors
1. Compare throttle, MAF, and MAP data on a scan tool. 2. Repair the mismatch source, then clear the code.
Frequently asked questions
What usually triggers P0068?
A big unmetered air leak after the MAF is the classic cause, because it makes the airflow reading disagree with the throttle position.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.