P2136
Throttle/Pedal Position Sensor/Switch "A"/"C" Voltage Correlation
- Severity
- High
- Driving
- Drive only to a garage
The two throttle or pedal position sensors "A"/"C" disagree with each other. These systems use more than one sensor deliberately so the module can cross-check them; when they stop agreeing it cannot tell which one to believe, so it takes the safe option and limits power. This is a designed safety behaviour rather than a malfunction of the limp mode itself.
Possible causes
- CommonOne of the two sensors failing or drifting
- CommonCorroded connector affecting one signal
- PossibleWiring fault on one of the two signal circuits
- PossibleCarbon build-up making the throttle plate stick
- PossibleFailed throttle body assembly where both sensors are integrated
What you might notice
- Reduced power mode, often engaging suddenly
- Warning light on, usually with a power or throttle warning
- Engine limited to a low speed
- Erratic throttle response
What to check, in order
- Take the reduced-power mode seriously - it exists because the module cannot trust the pedal, and it may engage without warning.
- Watch both sensor values side by side on the live data screen through a slow pedal sweep. The one that jumps, sticks or reads implausibly is the faulty one.
- Inspect both connectors for corrosion and water ingress.
- Check the throttle plate for carbon build-up preventing free movement.
- On many vehicles both sensors live inside one throttle body assembly, in which case the assembly is replaced as a unit.
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