Powertrain, generic (extended)

P2136 Throttle/Pedal Position Sensor/Switch A/C Voltage Correlation

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2136 reports that position signals A and C disagree. On engines with two electronic throttles, C typically belongs to the second throttle body: GM's 2023 table 23OBDG07 assigns C to sensor 1 of the bank 2 throttle. Mercedes-Benz documents P2136 for its M177 twin-turbo V8 in AMG C63, GLC63, SL63 and related models: bulletin LI07.10-P-080384 lists it with P2135, the A/G and B/G checks and actuator faults, traces the set to increased electrical resistance in the connector pins of both throttle actuators, and replaces the connector sockets with coated terminals. FCA also lists the code in emissions recall T21 for the 2004-2006 Dodge Sprinter. Expect a warning lamp and possibly reduced power.

Likely causes

Increased resistance in the throttle actuator connector pins
Position sensor in one throttle body drifted or worn
Carbon or ice making one throttle lag behind the other

Symptoms

  • Engine warning lamp on
  • Possible loss of power
  • Often stored together with P2135

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–900
Time1–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle position sensorthrottle body

Related codes

P2135P2137P2AD3P2AD2P210E

References: static.nhtsa.gov, gsi.ext.gm.com, static.nhtsa.gov.