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. These sensors are used by the powertrain control module (PCM) to determine driver demand and throttle position. When the voltage signals from sensor A and sensor C do not match within a specified range, the PCM sets this code. This can cause erratic throttle response, reduced power, or limp mode.
01. Most Common Causes
- Faulty throttle position sensor (TPS) or accelerator pedal position sensor (APP)
- Wiring issues: short, open, or corrosion in sensor circuits
- Poor electrical connections at sensor or PCM
- Failed PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Erratic idle or stalling
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P2136 and check freeze frame data.
Step 2: Visually inspect wiring and connectors for damage, corrosion, or loose pins.
Step 3: Test sensor voltage signals with a multimeter; compare A and C voltages per manufacturer specs.
Step 4: If voltages are out of range, replace the faulty sensor (TPS or APP).
Step 5: Clear code and test drive to confirm repair.
04. Commonly Affected Makes
05. 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.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the sensor and labor rates.