P2137: Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation
Do not keep driving
Ask which correlation pairs are faulted — the combination identifies the sensor at fault far better than any single code does.
What this code means
Position sensors B and C disagree. The argument under P2135 applies, and the three-way narrowing described under P2136 is what makes this code useful rather than merely another symptom: B/C failing while A/B and A/C pass points at neither A nor the shared supply, which is a genuinely informative elimination.
Likely causes
Start here
- Failed sensor reference voltage supply · moderate
- Corroded or loose connector · easy
- Faulty accelerator pedal position sensor · easy
Less common
- Poor sensor ground connection · moderate
- Faulty throttle position sensor · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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