What Does P2137 Mean?
The PCM has identified that throttle/pedal position sensors B and C are not providing properly correlated voltage signals. This redundancy fault indicates sensor degradation, circuit problems, or mechanical issues affecting sensor accuracy.
Safety Warning
Expect immediate limp mode activation with significant power reduction and limited speed capability. Vehicle should only be driven slowly to nearest repair facility.
Common Causes
45%
Defective accelerator pedal position (APP) sensor with failed sensor element
30%
Failed throttle position sensor in electronic throttle body assembly
12%
Wiring harness damage or connector corrosion affecting sensor circuits
8%
Ground circuit issue causing sensor voltage reference problems
5%
Throttle body mechanical fault or contamination affecting sensor correlation
Diagnostic Steps
1
Step 1: Monitor sensors B and C voltages on scan tool during slow pedal application; note which sensor exhibits abnormal voltage or tracking
2
Step 2: Check for proper 5V reference voltage and clean ground at both APP sensor and throttle body connectors
3
Step 3: Perform resistance checks on sensor circuits between connectors and PCM to identify open or high-resistance faults
4
Step 4: Inspect throttle body for mechanical binding, dirt, or carbon that could affect position sensing accuracy
5
Step 5: Replace faulty sensor assembly (APP sensor or complete throttle body) after confirming which sensor pair is defective
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has identified that throttle/pedal position sensors B and C are not providing properly correlated voltage signals. This redundancy fault indicates sensor degradation, circuit problems, or mechanical issues affecting sensor accuracy.
The most common cause of P2137 (Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation) is: Defective accelerator pedal position (APP) sensor with failed sensor element
Typical repair costs for P2137 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Expect immediate limp mode activation with significant power reduction and limited speed capability. Vehicle should only be driven slowly to nearest repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2137 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
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