P2176 fault code: what it means

P2176: Throttle idle position not learned. Idle may be unstable; usually needs an idle relearn after cleaning or battery work.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

idle relearn not done
dirty throttle body

P2176 by make

Honda

Throttle idle position not learned. Idle may be unstable; usually needs an idle relearn after cleaning or battery work.

Usual causes: idle relearn not done; dirty throttle body

Mercedes-Benz

Throttle idle position not learned. Rough idle until adapted.

Usual causes: throttle adaptation not done; battery disconnected; dirty throttle body

What the repair usually costs

Throttle body clean and idle relearnNZ$90–NZ$190 · A$100–A$200
Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190

Not sure what P2176 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.