P2137 — Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2137 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the throttle and intake air metering for damage, corrosion, chafing or poor contact.
Subsystem check Inspect and clean the throttle body; check that the plate moves freely.
Subsystem check Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2137 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2137 (parts and labor, USD, independent shop rates): Replace the MAF or MAP sensor: $150–$400; Clean the throttle body: $80–$200; Replace the throttle body assembly: $250–$700. Overall, fixing P2137 usually costs between $80 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Is it safe to drive with P2137?

Drive with caution. Many throttle faults put the car into limp mode with limited power — enough to reach a shop, not for highway trips. If the engine stalls or the pedal stops responding, do not drive.

How do I diagnose P2137 myself?

Start with a scan: confirm P2137, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the throttle and intake air metering, and verify the suspect component against live data before buying parts.

What is the most common cause of P2137?

The most common causes are: failed electronic throttle motor, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.

What does OBD2 code P2137 mean?

Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation (P2137): a powertrain (engine/transmission) fault affecting the throttle and intake air metering. Short, gentle driving to a shop is usually possible. Most often caused by failed electronic throttle motor, wiring or connector faults in the throttle circuit, intake air leaks after the MAF sensor.

Will P2137 clear itself?

Sometimes P2137 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does P2137 mean?

P2137 is logged by the onboard diagnostics when the throttle and intake air metering does not behave as expected. The official definition is “Throttle/Pedal Pos Sensor/Switch B / C Voltage Correlation”. This is a powertrain (engine/transmission) category code.

To set P2137, the control module compares live readings of the throttle and intake air metering against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P2137?

dirty throttle body or stuck throttle plate
failed electronic throttle motor
contaminated or failed MAF/MAP sensor
wiring or connector faults in the throttle circuit

Common symptoms of P2137

limp-home mode with reduced power
unstable or high idle
Check Engine Light on
poor throttle response
stalling when coming to a stop

How to diagnose P2137

Connect an OBD2 scanner, confirm P2137 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the throttle and intake air metering for damage, corrosion, chafing or poor contact.
Inspect and clean the throttle body; check that the plate moves freely.
Watch throttle position and MAF/MAP readings in live data while pressing the pedal — values should change smoothly.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2137 does not return.

How to fix P2137

Start with the cheapest and most common causes before replacing expensive parts:

Replace the MAF or MAP sensor — $150–$400
Clean the throttle body — $80–$200
Replace the throttle body assembly — $250–$700

How much does it cost to fix P2137?

Repair cost depends on which component actually failed. Typical scenarios for P2137 (parts and labor, USD, independent shop rates):

Replace the MAF or MAP sensor: $150–$400
Clean the throttle body: $80–$200
Replace the throttle body assembly: $250–$700

Overall, fixing P2137 usually costs between $80 and $700. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.