P2164 — Throttle/Pedal Position Sensor “B” Maximum Stop Performance #

Note: The wording of this code may vary depending on the vehicle manufacturer.

• Throttle/Pedal Position Sensor “B” Max Stop Perf. (Ford, GM, Toyota, Honda, Nissan)
• Accelerator Pedal Position Sensor “B” Range/Performance – Maximum Stop (Volkswagen, Audi, Mercedes-Benz)
• APP Sensor “B” Max Stop Performance (Chrysler, Dodge, Jeep)

Summary of Code P2164 #

P2164 is an OBD-II diagnostic trouble code indicating an issue with the throttle/pedal position sensor “B”—specifically, that the sensor is reporting a value at or beyond its expected maximum mechanical stop. This sensor is part of the drive-by-wire system, which electronically controls the throttle based on driver input. When the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects a reading from sensor “B” outside of the calibrated range, it sets this code. The result can be inconsistent throttle response, reduced engine power, or even limp mode to protect the engine and transmission. Prompt diagnosis is essential to restore proper vehicle performance and safety.

Common Symptoms for Code P2164 #

When P2164 is triggered, you may notice several drivability issues. Some symptoms can be subtle, while others may severely limit your ability to drive normally. Being aware of these can help you recognize and address the problem early.

• Check Engine Light (CEL) illuminated
• Reduced engine power or “limp” mode
• Delayed or unresponsive throttle (slow acceleration)
• Inconsistent idle speed or stalling
• Poor fuel economy
• Hard starting or no start condition (rare, but possible)

Likely Causes for Code P2164 (Most to Least Common) #

This code can be triggered by a variety of underlying issues, some more common than others. Understanding the typical causes helps prioritize your diagnosis and repair.

1. Faulty throttle or pedal position sensor “B” (sensor malfunction or wear)
2. Wiring issues (damaged, shorted, or corroded wires/connectors between the sensor and ECM/PCM)
3. Misadjusted or dirty throttle body (throttle plate not returning to its proper stop)
4. Faulty ECM/PCM (rare, but possible if other causes are ruled out)
5. Incorrectly installed aftermarket parts (such as throttle bodies or pedals that are not OEM-spec)

Step-By-Step Diagnosis for Code P2164 #

Proper diagnosis of P2164 requires a systematic approach to avoid unnecessary part replacement. Here’s a recommended workflow:

• Check for additional codes (especially those related to throttle or pedal position sensors)
• Inspect and test all wiring and connectors to the throttle/pedal position sensor “B” for damage, corrosion, or loose pins
• Use a scan tool to monitor live data from both throttle and pedal position sensors—compare sensor “B” with others for irregularities
• Visually inspect the throttle body (look for carbon buildup or anything preventing proper movement of the throttle plate)
• Test the sensor “B” signal using a multimeter (check for proper voltage range as specified by the OEM)
• Verify mechanical stops on the pedal and throttle—ensure no obstructions or misadjustment
• Clear the code and perform a road test to see if the fault returns

Possible Repairs for Code P2164 #

Repairs should target the underlying issue. Depending on your diagnosis, one or more of the following may be needed:

• Repair or replace damaged wiring/connectors between the sensor and ECM/PCM
• Replace faulty throttle or pedal position sensor “B” with an OEM part
• Clean or service the throttle body (remove carbon deposits, check for proper operation)
• Recalibrate or reprogram the throttle system (if required by the manufacturer after component replacement)
• Replace the ECM/PCM (only after all other causes have been ruled out)

Is It Safe to Drive With Code P2164? #

Driving with code P2164 is generally not recommended. While the vehicle may still run, the loss of throttle control or reduced power mode can make driving unpredictable or even unsafe—especially during overtaking, merging, or in heavy traffic conditions. If your car enters limp mode or the throttle response is unreliable, have it inspected and repaired as soon as possible to avoid further damage or a potential breakdown.

Vehicles Most Frequently Affected by Code P2164 #

P2164 can occur on almost any modern vehicle with electronic throttle control, but some makes and models are more commonly affected due to sensor or wiring design. Based on field experience:

• Ford F-Series (F-150, F-250, etc.)
• Chevrolet Silverado and GMC Sierra
• Toyota Camry, Corolla, Tacoma
• Nissan Altima, Sentra, Frontier
• Volkswagen Golf, Jetta
• Honda Accord, Civic
• Dodge Ram, Jeep Grand Cherokee

Common Mistakes & Best Practices for Code P2164 #

Misdiagnosis is common with this code, especially when related systems are involved. Here’s how to avoid the pitfalls:

• Do not replace the sensor before checking wiring and connectors—many issues are electrical, not mechanical
• Always use OEM-spec sensors—aftermarket versions may cause compatibility issues
• Check for technical service bulletins (TSBs)—some manufacturers have known fixes for recurring P2164 cases
• Clear codes only after confirming repairs—don’t just reset the light and hope for the best
• Perform all relearn/calibration procedures required by the OEM after sensor or throttle body replacement

Quick FAQ for Code P2164 #

Got more questions? Here are quick answers to the most common ones:

• Q: Can a dirty throttle body cause P2164?
  A: Yes. Carbon buildup can prevent the throttle plate from reaching its calibrated stop, triggering the code.
• Q: Does P2164 mean I have to replace the ECM/PCM?
  A: Rarely. The ECM/PCM is usually not the root cause; check sensors, wiring, and mechanical stops first.
• Q: After fixing the issue, do I need to perform a throttle relearn?
  A: In most cases, yes. Follow your OEM’s procedures to ensure optimal performance.