Throttle/Pedal Position Sensor "A" Maximum Stop Performance
P2163 indicates the throttle or pedal position sensor A has reached its maximum stop position, meaning the sensor signal is stuck at or beyond its highest calibrated value. This prevents the engine control module from accurately reading throttle input, causing severe drivability issues and potential safety concerns.
What You Might Notice
- Lack of throttle response or delayed acceleration
- Limited or no acceleration capability
- Engine stalling at idle
- Hesitation when accelerating
- Cruise control inoperative or disabled
Most Common Causes
- 1
Defective Throttle Position Sensor (TPS)
The sensor is mechanically stuck, electrically failed, or sending an out-of-range maximum signal due to internal wear or corrosion.
- 2
Wiring or Connector Issues
Damaged wiring harness, corroded connectors, or loose connections to the throttle position sensor can cause signal errors and maximum stop condition readings.
- 3
Throttle Body Mechanical Failure
The throttle plate may be stuck in the wide-open position or the sensor potentiometer inside the throttle body assembly has failed, preventing proper sensor calibration.
- 4
Engine Control Module (ECM) Calibration Error
The ECM may have lost its sensor calibration data or requires reprogramming to properly establish the throttle sensor's minimum and maximum stop points.
How to Diagnose It
- 1
Check Defective Throttle Position Sensor (TPS) — The sensor is mechanically stuck, electrically failed, or sending an out-of-range maximum signal due to internal wear or corrosion.
- 2
Check Wiring or Connector Issues — Damaged wiring harness, corroded connectors, or loose connections to the throttle position sensor can cause signal errors and maximum stop condition readings.
- 3
Check Throttle Body Mechanical Failure — The throttle plate may be stuck in the wide-open position or the sensor potentiometer inside the throttle body assembly has failed, preventing proper sensor calibration.
- 4
Check Engine Control Module (ECM) Calibration Error — The ECM may have lost its sensor calibration data or requires reprogramming to properly establish the throttle sensor's minimum and maximum stop points.
How to Fix It
- 1
Replace Throttle Position Sensor
Remove and replace the defective throttle position sensor A with a new or remanufactured unit, then recalibrate the sensor range using a diagnostic scanner.
- 2
Inspect and Repair Wiring/Connectors
Examine the throttle sensor wiring harness and connectors for damage, corrosion, or loose connections; repair or replace damaged wiring and clean corroded connectors.
- 3
Clean or Replace Throttle Body
Remove and inspect the throttle body for mechanical binding or stuck throttle plate; perform professional cleaning or replace the throttle body assembly if damage is found.
- 4
Reprogram or Recalibrate ECM
Use a professional diagnostic scanner to recalibrate the throttle sensor range in the engine control module or perform a full ECM reprogramming if calibration data is corrupted.
Need a deeper diagnosis?
Search for related repair guides or browse by system.