What Does P2136 Mean?
The PCM detects that throttle/pedal position sensors A and C do not correlate correctly with each other. This redundancy check failure indicates one of the sensor circuits is providing inaccurate data due to sensor, wiring, or mechanical failure.
Safety Warning
Vehicle will enter limp mode with drastically reduced power output. Safe to drive at low speeds to service facility but not suitable for highway or normal traffic conditions.
Common Causes
45%
Faulty accelerator pedal position (APP) sensor assembly
30%
Failed throttle position sensor on electronic throttle body
15%
Corroded or damaged wiring/connector at sensor
7%
Reference voltage circuit fault (5V supply issue)
3%
Throttle blade binding or carbon buildup causing mechanical/electrical mismatch
Diagnostic Steps
1
Step 1: Use scan tool to monitor all throttle/pedal position sensor voltages simultaneously (A, B, C) during operation
2
Step 2: Compare sensor A and C voltage patterns; identify which sensor is out of specification or not tracking properly
3
Step 3: Backprobe sensor connectors with multimeter to verify reference voltage, ground integrity, and signal voltages match scan tool data
4
Step 4: Inspect throttle body bore and blade for carbon deposits; clean throttle body and perform relearn if needed
5
Step 5: Replace the sensor assembly (APP or throttle body) that contains the faulty sensor element
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM detects that throttle/pedal position sensors A and C do not correlate correctly with each other. This redundancy check failure indicates one of the sensor circuits is providing inaccurate data due to sensor, wiring, or mechanical failure.
The most common cause of P2136 (Throttle/Pedal Pos Sensor/Switch A / C Voltage Correlation) is: Faulty accelerator pedal position (APP) sensor assembly
Typical repair costs for P2136 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will enter limp mode with drastically reduced power output. Safe to drive at low speeds to service facility but not suitable for highway or normal traffic conditions.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2136 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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