Permanent Code
A permanent code is a confirmed emission-related code that cannot be cleared with a scan tool.
What is Permanent Code?
It was introduced so codes cannot simply be erased before an emissions test. It clears only after the system confirms the repair by running its monitor successfully. Disconnecting the battery does not remove it. Permanent codes exist on cars built to newer OBD standards, roughly from 2010 onward in the US. The scan tool shows them in a separate list.
How it works
The control unit removes the code after the relevant monitor passes.
Why it matters for your car
A car with a permanent code may fail an inspection even if the lamp is off. Drive normally after a repair so the monitors can run.
Other terms
- Agreed Value Insurance
- Backprobing
- Centre Console
- Charging Curve
- Clutch Master Cylinder
- Detonation (Engine Knock)
- Electronic Brakeforce Distribution (EBD)
- Far-Side (Centre) Airbag
- Feeler Gauge
- Firing Order
- Grease Nipple (Grease Fitting)
- Headlight Unit (Headlamp Assembly)
- Intelligent Battery Sensor (IBS)
- Mud Flaps (Splash Guards)
- Oil Analysis
- READY Indicator (EV And Hybrid)
- Retreaded Tyre
- Steer-by-wire
- Third-Party Liability Insurance
- Windscreen (Windshield)