Throttle/Pedal Position Sensor C/F Voltage Correlation
The P0229 code means the vehicle's onboard diagnostic system has detected: Throttle/Pedal Position Sensor C/F Voltage Correlation. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
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What Are the Symptoms of P0229?
- Check Engine Light on
- Vehicle enters reduced power mode
- Throttle response feels inconsistent
- Multiple TPS-related codes may be stored
What Causes P0229? (Most Likely First)
- One TPS sensor reading differently from its paired sensor Very High
- Carbon buildup on throttle blade causing sensor disagreement High
- Damaged wiring on one sensor circuit only Moderate
- PCM calibration or software fault Low
Can I Still Drive with P0229?
Short distances only. P0229 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does voltage correlation mean?
The PCM compares voltage readings from multiple throttle sensors. They should agree within a calibrated tolerance. A correlation fault means they disagree beyond that tolerance.
Can this be caused by a single bad sensor?
Yes, if one sensor in a pair is drifting or has a dead spot, it will disagree with its partner sensor, triggering the correlation code.
Do I need to replace both sensors?
Not always. Diagnose which sensor is reading incorrectly by comparing all TPS readings. Replace only the faulty component.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0229?
-
Read all TPS sensor voltages simultaneously on scan tool. Compare TPS C and F readings across throttle range.
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Calculate the expected correlation between sensors. They should have a predictable mathematical relationship.
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Clean throttle body and retest. Carbon buildup can cause one sensor to read slightly different.
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If cleaning does not resolve, replace the throttle body or accelerator pedal position sensor assembly.
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 P0229?
- 2010-2020 Ford F-150 (3.5L EcoBoost)
- 2012-2019 Chevrolet Silverado (5.3L)
- 2008-2018 Ram 1500 (5.7L HEMI)
- 2011-2020 GMC Sierra (5.3L)
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