OBD-II Generic Error Code P2140: How to Fix It

Q: Can I drive my car with a P2140 code?

Driving with P2140 is risky. The vehicle may enter limp mode, limiting your speed to around 20-40 mph to protect the engine and drivetrain. In some cases the throttle may behave erratically or the engine may stall unexpectedly. It is strongly recommended to diagnose and fix P2140 before driving the vehicle regularly, especially on highways.

Q: What is the most common cause of P2140?

The most common causes are a faulty accelerator pedal position (APP) sensor, a damaged or corroded wiring harness connector at the pedal or throttle body, or a defective throttle body assembly. Wiring issues — particularly corrosion in connectors — are frequently the root cause and should always be inspected before replacing sensors.

Q: Will P2140 clear itself after a repair?

No, P2140 will not clear itself automatically. You need to use an OBD2 scanner to manually clear the stored fault code after completing your repair. After clearing, perform a test drive so the ECM can run its monitors and confirm the fault no longer exists.

Q: Is P2140 the same as P2135 or P2138?

They are related but not identical. P2135 refers to a correlation fault between throttle position sensor circuits A and B on the throttle body, while P2138 is a correlation fault between accelerator pedal position sensor circuits D and E. P2140 specifically covers the E and F circuits of the throttle/pedal system. All three involve voltage correlation faults in the electronic throttle control system and share a similar diagnostic approach.

Q: How much does it cost to fix a P2140 code?

Cost varies widely depending on the root cause. Cleaning corroded connectors may cost nothing if you DIY. A replacement accelerator pedal position sensor/assembly typically ranges from $50 to $200 for parts. A replacement throttle body can range from $100 to $400 or more depending on the vehicle. If a shop performs the diagnosis and repair, expect $150 to $600 total including labor, with higher costs for luxury or European vehicles.

Abstract

The OBD-II P2140 error code indicates a voltage correlation fault between two signal circuits (E and F) in your throttle pedal position sensor or throttle body assembly. This means the two sensor signals that your vehicle's engine control module (ECM) uses to verify throttle input are not matching up as expected. Left unresolved, this fault can trigger limp mode, reduce engine power, or cause stalling — so it's important to diagnose and fix it promptly.