Powertrain, generic (extended)

P2137 Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P2137 compares position signals B and C and sets when their voltages drift apart beyond the calibrated tolerance. No manufacturer publishes a detection rule for this pair; FCA merely lists P2137 in emissions recall T21 for the 2004-2006 Dodge Sprinter among the codes that may surface after the ECU is reprogrammed. Where the letters are known, B is the second track of the main throttle and C a sensor on a second throttle body (GM 23OBDG07). The neighbouring pair A/C is documented by Mercedes on the M177 V8, where corroded or high-resistance actuator pins set it, which is the most likely pattern here too. Unlike P2135, which stays within one throttle, this check spans two components. Expect a warning lamp and possibly reduced power.

Likely causes

High resistance or corrosion at a throttle connector

Track B or sensor C drifted or worn

Fault on a shared 5 V reference or ground

Symptoms

Engine warning lamp on
Possible loss of power

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

P2135 P2136 P2AD2 P0221

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.