P2137
Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation
Throttle / pedal position
Generic OBD-II
High
What it means
P2137 means the two redundant throttle/pedal position signals ("B" and "C") no longer agree with each other. The PCM cross-checks these for safety, so when they disagree it can't trust the driver-demand reading and usually forces reduced-power or limp mode until the sensor or wiring is fixed.
High
Can I keep driving? Drive gently and fix it soon — a correlation fault almost always forces reduced-power or limp mode, so acceleration is limited and merging can be unsafe.
Common symptoms
What you'll notice
- Check-engine light on
- Reduced engine power / limp (failsafe) mode
- Hesitation, surging, or poor throttle response
- Rough or erratic idle
Common causes
Most likely first
- Faulty throttle or accelerator-pedal position sensor (the 'B' and 'C' signals no longer agree)Likely
- Open, shorted, or chafed wiring between the sensor and PCMCommon
- Poor connector contact, corrosion, or a bad ground at the sensor plugCommon
- Faulty engine control module (ECM)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note which throttle/pedal codes are stored alongside it (P2135, P2138).
- Inspect the sensor connector and harness for damage, corrosion, and spread pins.
- With key on, engine off, verify both signals track together as the pedal/throttle is swept, and confirm a steady 5-volt reference and clean ground.
- Repair any wiring or ground faults, then clear and re-test.
- If the two signals still disagree, replace the position sensor (pedal or throttle body assembly) as specified.
FAQ
Quick answers
Is it safe to drive with P2137?+
Only briefly and gently. The redundant B/C check exists for safety, so a mismatch usually triggers limp mode and limited power.
Can I just clear P2137?+
It will reset almost immediately if the two position signals still don't agree — the wiring or sensor needs to be repaired first.
Related codes
Often seen with P2137
Read & clear P2137 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX