Throttle/Pedal Position Sensor Maximum Stop Performance
Code P2163 indicates that the Engine Control Module (ECM) has detected that the throttle or pedal position sensor signal is stuck at or beyond the maximum expected stop position. This typically means the sensor voltage is higher than the normal range, suggesting a short to voltage, a faulty sensor, or a mechanical issue with the throttle plate or pedal assembly. The ECM uses this signal to determine driver demand and control throttle actuation; an out-of-range signal can cause reduced engine power or limp mode.
1. Most Common Causes
- Faulty or worn accelerator pedal position sensor 'A'
- Mechanical misalignment or damage in sensor mounting (looseness, angular shift)
- Short circuit to voltage in the sensor signal circuit (SIGA)
- Short circuit to voltage in the 5V reference circuit (VREF) powering the sensor
- Excessive resistance or open circuit in the sensor return (ground) circuit
- Corrosion, moisture, or damage in the sensor electrical connector
- Intermittent wiring or harness failure due to flexing or chafing
- PCM with incorrect calibration or internal damage (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Engine may not respond to pedal input
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2163 and check for additional codes.
Step 2: Visually inspect the throttle body and pedal assembly for binding or debris.
Step 3: Test the TPS/APP sensor voltage with a multimeter; compare to manufacturer specs.
Step 4: Check wiring and connectors for damage, corrosion, or shorts.
Step 5: If sensor is faulty, replace it and clear the code.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, limiting speed and acceleration, which can be dangerous in traffic.
How much does it cost to fix?▼
Typically $50-$150 for a sensor replacement, plus diagnostic fees if done at a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.