What Does P2164 Mean?
The PCM has detected that Throttle/Pedal Position Sensor B is not reaching or maintaining its maximum stop position correctly. This redundant sensor verification fault indicates sensor B cannot properly detect throttle closed position or has calibration issues.
Safety Warning
Critical safety issue potentially causing unpredictable throttle response, stuck throttle, or engine speed control failure. Vehicle operation is unsafe and should be limited to transport to repair facility only.
Common Causes
40%
Failed or miscalibrated accelerator pedal position sensor (sensor B circuit)
25%
Mechanical binding or obstruction in pedal assembly preventing full return
20%
Wiring fault specific to sensor B circuit (open, high resistance, or poor ground)
10%
Throttle body calibration error or electronic throttle control module fault
5%
Voltage supply issue affecting sensor B reference voltage
Diagnostic Steps
1
Step 1: Monitor both APP sensor A and B simultaneously on scan tool, comparing voltage/percentage readings through full pedal travel to identify discrepancy in sensor B
2
Step 2: Physically inspect pedal mechanism for smooth operation, proper spring tension, and complete return to rest position without binding
3
Step 3: Access accelerator pedal sensor connector and measure sensor B circuit voltages: reference voltage (should be ~5V), signal voltage at rest (typically 0.5-1.0V), and ground continuity
4
Step 4: Perform pedal position sensor relearn or initialization procedure per manufacturer specifications to recalibrate both sensors
5
Step 5: If sensor B circuit tests good but correlation remains off, replace accelerator pedal position sensor assembly as sensors are typically integrated
Estimated Repair Cost
$200 - $800
Parts + labor, varies by vehicle and location
The PCM has detected that Throttle/Pedal Position Sensor B is not reaching or maintaining its maximum stop position correctly. This redundant sensor verification fault indicates sensor B cannot properly detect throttle closed position or has calibration issues.
The most common cause of P2164 (Throttle/Pedal Position Sensor "B" Maximum Stop Performance) is: Failed or miscalibrated accelerator pedal position sensor (sensor B circuit)
Typical repair costs for P2164 range from $200 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Critical safety issue potentially causing unpredictable throttle response, stuck throttle, or engine speed control failure. Vehicle operation is unsafe and should be limited to transport to repair facility only.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2164 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control System
Difficulty
Type
Generic (SAE)
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