P2131: Throttle/Pedal Position Sensor Circuit Range/Performance
Code P2131 indicates that the Engine Control Module (ECM) has detected a range or performance issue in the throttle/pedal position sensor circuit. This typically means the voltage signal from the accelerator pedal position (APP) sensor or throttle position sensor (TPS) is out of expected range or inconsistent. The ECM compares signals from multiple sensors; if they don't match, it sets this code. Common causes include a faulty APP sensor, TPS, wiring issues, or a defective throttle body.
1. Most Common Causes
- Faulty accelerator pedal position (APP) sensor 'F' / sensor 3 (internal wear, dead spot)
- Faulty throttle position sensor (TPS) 'F' / sensor 3
- Damaged wiring or connectors in circuit 'F' (corrosion, loose terminals, intermittent high resistance)
- Electrical noise / electromagnetic interference (EMI) on the sensor 'F' signal line
- Mechanical wear of the throttle body (play, carbon buildup) causing correlation discrepancy
- Internal ECM failure (rare, but possible in the specific ADC reading circuit)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Unstable idle or stalling
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm code P2131 and check for other codes.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test sensor voltage and resistance with a multimeter per manufacturer specs.
Step 4: If sensors are okay, clean throttle body and recalibrate if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The vehicle may enter limp mode, reducing power and potentially causing unsafe driving conditions. Have it diagnosed and repaired promptly.
How much does it cost to fix?▼
Costs range from $50 to $150 for DIY parts (sensor or throttle body cleaning) to $200-$500 for professional repair including labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.