P0127: Intake Air Temperature Too High
What to do
Expect reduced performance, especially in hot weather or after sustained hard driving. On a turbocharged car, have the intercooler and its airflow checked.
What this code means
The measured intake air temperature has exceeded what the module considers reasonable. Hot intake air carries less oxygen and raises the risk of detonation, so the module protects the engine by pulling timing and reducing boost — the driver feels this as a car that goes noticeably worse when hot. On turbocharged engines, a blocked or failing intercooler is a leading physical cause; elsewhere, recirculating engine bay heat or a genuinely failed sensor.
Likely causes
Start here
- Blocked or failing intercooler · moderate
- Faulty intake air temperature sensor · easy
- Sensor heat soak from poor mounting or airflow · moderate
Less common
- Restricted air filter · easy
- Debris blocking sensor airflow · easy
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P0127.