Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation
The P2139 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor/Switch D/F Voltage Correlation. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $700 (parts and labor)
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What Are the Symptoms of P2139?
- Reduced engine power
- Throttle does not match pedal input
- Delayed or inconsistent acceleration
- Limp mode active
- Check engine light on
What Causes P2139? (Most Likely First)
- APP sensor D output not matching TPS F output from throttle body Very High
- Carbon buildup on throttle body causing position error High
- Faulty electronic throttle body TPS Moderate
- Faulty accelerator pedal position sensor Moderate
- Wiring issue in either D or F circuit Low
Can I Still Drive with P2139?
Short distances only. P2139 is rated critical severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Can I drive with code P2139?
Only short distances. The PCM has detected a mismatch between pedal position and throttle body position, meaning the throttle is not going where the pedal tells it. The vehicle will have limited power.
Could this be a pedal problem or a throttle body problem?
It could be either. The D circuit is on the pedal and the F circuit is on the throttle body. You need to determine which sensor is reading incorrectly by comparing each to its companion sensor (D compared to E, and F compared to the primary TPS).
Why does the PCM compare pedal position to throttle position?
The PCM cross-references pedal position with actual throttle position to verify the electronic throttle system is working correctly. If the pedal says 50% but the throttle is only at 20%, something is wrong and the PCM limits power to prevent unsafe conditions.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2139?
-
Compare APP sensor D reading to TPS F reading with scan tool -- they should show consistent relationship
-
Clean throttle body to ensure TPS F reads accurately
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Test APP sensor D by pressing pedal slowly -- signal should be smooth and consistent
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Check both sensor connectors for corrosion or damage
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If cleaning does not resolve, determine which sensor (pedal or throttle body) has the incorrect reading
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2139?
- 2008-2018 Toyota Corolla
- 2007-2017 Nissan Sentra
- 2009-2019 Honda Accord
- 2010-2020 Chevrolet Cruze
- 2006-2016 Ford Focus
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