Throttle/Pedal Position Sensor A/C Voltage Correlation
The P2136 code indicates a correlation error between the throttle position sensor (TPS) A and C circuits, or between the accelerator pedal position sensor (APP) A and C circuits. The PCM detects that the voltage signals from these sensors do not match within a specified range, suggesting a fault in the sensor, wiring, or connector. This can cause incorrect throttle control, leading to poor engine performance.
1. Most Common Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor (APP)
- Damaged wiring or loose/corroded connectors in the sensor circuit
- Carbon buildup on throttle body affecting sensor readings
- PCM software or hardware failure (rare)
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Erratic idle or stalling
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data. Clear code and test drive to see if it returns.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose connections. Repair as needed.
Step 3: Using a multimeter, check voltage and ground at the sensor connector. Compare with manufacturer specs.
Step 4: Test sensor resistance and voltage output while manually moving throttle or pedal. Replace sensor if out of range.
Step 5: If sensor and wiring are good, check for PCM issues; reprogram or replace 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 increasing risk of accidents. Have it diagnosed promptly.
How much does it cost to fix?▼
Typically $50-$150 for sensor replacement, plus diagnostic fees. Wiring repairs may add $100-$200.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.