What Does P2139 Mean?
The PCM has determined that throttle/pedal position sensors D and F do not correlate properly. This indicates one sensor circuit is providing incorrect data, compromising the redundancy safety system in the electronic throttle control.
Safety Warning
Limp mode will activate immediately, limiting vehicle speed and power output significantly. Only drive at reduced speed to nearest service facility.
Common Causes
50%
Defective accelerator pedal position (APP) sensor
25%
Corroded or damaged APP sensor connector with poor electrical contact
12%
Wiring harness damage between APP sensor and PCM
8%
Failed throttle body position sensor (vehicle-dependent sensor configuration)
5%
PCM internal fault affecting sensor input processing
Diagnostic Steps
1
Step 1: View live data for sensors D and F while slowly depressing accelerator pedal; identify which sensor shows abnormal voltage or tracking
2
Step 2: Inspect APP sensor connector for corrosion, moisture, or terminal damage; clean with electrical contact cleaner if needed
3
Step 3: Verify 5V reference voltage and ground integrity at APP sensor connector with digital multimeter
4
Step 4: Perform voltage drop test on signal wires between sensor and PCM to identify high-resistance connections
5
Step 5: Replace APP sensor assembly if circuits test within specification but correlation error continues
Estimated Repair Cost
$150 - $600
Parts + labor, varies by vehicle and location
The PCM has determined that throttle/pedal position sensors D and F do not correlate properly. This indicates one sensor circuit is providing incorrect data, compromising the redundancy safety system in the electronic throttle control.
The most common cause of P2139 (Throttle/Pedal Pos Sensor/Switch D / F Voltage Correlation) is: Defective accelerator pedal position (APP) sensor
Typical repair costs for P2139 range from $150 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Limp mode will activate immediately, limiting vehicle speed and power output significantly. Only drive at reduced speed to nearest service facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2139 to identify the root cause.
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Quick Info
Category
Powertrain
System
Electronic Throttle Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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