P2176
Throttle Actuator Control System - Idle Position Not Learned
- Severity
- Medium
- Driving
- Drivable — book it in
The throttle's idle position has not been learned. These systems measure where the throttle plate rests when unpowered and use that as their zero point - and after cleaning, replacement or a battery disconnection, that reference is gone until the relearn procedure is run. Nothing has failed; a calibration is missing.
Possible causes
- CommonRelearn never run after cleaning or replacing the throttle body
- CommonBattery disconnected, clearing the learned position
- CommonRelearn attempted but its conditions were never met
- CommonAnother stored fault preventing the procedure from completing
- PossibleCarbon preventing the plate reaching its true rest position
What you might notice
- Idle too high, too low or hunting
- Hesitation when pulling away
- Reduced power mode
- Behaviour noticeably worse since throttle body work
What to check, in order
- Ask what was done. Throttle body cleaning, replacement or a battery disconnection immediately before this appeared is the explanation.
- Run the relearn procedure. It usually requires specific conditions - a warm engine, everything switched off, the accelerator untouched - and must be allowed to finish.
- Clear any other stored faults first. The procedure will not complete while another fault is active.
- If the relearn will not complete, check the plate reaches its true rest position - carbon can hold it slightly open.
- Do not replace parts for this code. It is a procedure, not a component.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx
Fuel and air metering
P2100P2101P2102P2103P2104P2105P2106P2107P2108P2109P2110P2111P2112P2113P2114P2115P2116P2117P2118P2119P2120P2121P2122P2123P2124P2125P2126P2127P2128P2129P2130P2131P2132P2133P2134P2135P2136P2137P2138P2139P2140P2141P2142P2143P2144P2145P2146P2147P2148P2149P2150P2151P2152P2153P2154P2155P2156P2157P2158P2159P2160P2161P2162P2163P2164P2165P2166P2167P2168P2169P2170P2171P2172P2173P2174P2175P2176P2177P2178P2179P2180P2181P2182P2183P2184P2185P2186P2187P2188P2189P2190P2191P2192P2193P2194P2195P2196P2197P2198P2199