Throttle/Pedal Position Sensor D/F Voltage Correlation
Code P2139 indicates a voltage correlation fault between the throttle position sensor D and F circuits. These sensors monitor the accelerator pedal position and throttle plate angle. The PCM detects a mismatch in voltage signals, often due to wiring issues, sensor failure, or a faulty throttle body. This can cause erratic throttle response or limp mode.
01. Most Common Causes
- Faulty throttle position sensor
- Wiring or connector issues in sensor circuits
- Corroded or loose electrical connections
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light on
- Reduced engine power or limp mode
- Poor acceleration or hesitation
- Erratic idle or stalling
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect wiring and connectors for damage or corrosion.
Step 3: Test throttle position sensor voltage with a multimeter per manufacturer specs.
Step 4: Check for continuity and shorts in sensor circuits.
Step 5: If all else fails, replace the throttle body assembly.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the vehicle may enter limp mode, reducing power and posing a safety risk.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Sensor replacement can range from $100-$300, while throttle body replacement may cost $200-$600.