P2137

Throttle/Pedal Position Sensor/Switch B/C Voltage Correlation

Q: 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.

Q: 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.

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.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P2137 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX