Throttle/Pedal Position Sensor Minimum Stop Performance
Code P2116 indicates that the throttle actuator control (TAC) system has detected a malfunction in the minimum stop position of the throttle pedal position sensor or throttle position sensor. This typically means the sensor signal is not matching the expected idle position when the pedal is released. The ECM monitors the sensor voltage and compares it to a learned minimum stop value; if the voltage is out of range or erratic, this code sets.
1. Most Common Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor (APPS)
- Wiring or connector issues (open, short, corrosion)
- Carbon buildup on throttle body causing sticking
- ECM software or hardware failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor idle or stalling
- Unresponsive or jerky acceleration
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors at throttle body and pedal position sensor for damage or corrosion.
Step 3: Use a multimeter to check sensor reference voltage (typically 5V) and signal voltage at idle (should be around 0.5-1.0V for TPS, 0.5-1.5V for APPS).
Step 4: Perform throttle body cleaning if carbon buildup is suspected, then relearn idle (if applicable).
Step 5: If sensor readings are out of spec, replace the faulty sensor (TPS or APPS) and clear codes.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The vehicle may enter limp mode, reducing power and increasing risk of accidents. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor. Sensor replacement is the most common fix.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.