P2138 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2138 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2138 code

P2138 is a diagnostic trouble code (DTC) for "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P2138 DIAGNOSTIC Get a fair and transparent estimate upfront

P2128 Code Definition

Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation

What the P2128 code means

The P2128 trouble code indicates that the Engine Control Module has detected a malfunction within the D and/or E circuits of the throttle position sensor.

What are the causes of the P2128 code?

  • A defective throttle body motor

  • A damaged connector or wiring that is associated with the throttle body motor

  • A faulty throttle position sensor

  • A damaged connector or wiring that is associated with the throttle body motor

  • A faulty Engine Control Module

What are the symptoms of the P2128 code?

  • Vehicle may stall
  • Vehicle may not start
  • Vehicle may not accelerate well
  • A Check Engine Light will be illuminated

How does a mechanic diagnose the P2128 code?

  1. A mechanic may begin diagnosing the P2128 trouble code by locating the throttle body under the hood of the vehicle.

  2. Once located, the throttle body motor and throttle position sensor will be examined for circuitry issues related to the wiring and connectors.

  3. After that the mechanic would then test the throttle body motor and the throttle position sensor for proper function using the manufacturer’s recommended procedure.

  4. Finally, the mechanic would then test the Engine Control Module for proper function.

Any parts found to be faulty during this diagnosis would be replaced at the customer’s request.

Common mistakes when diagnosing the P2128 code

An easy mistake to make when diagnosing the P2128 trouble code would be to have the throttle position sensor replaced and ‘hoping’ it fixes the problem. Although this is one of the most common causes of the P2128 trouble code, it is not always the cause. Taking this into consideration, it is always important to fully test every aspect of a circuit to diagnose an electrical problem correctly.

How serious is the P2128 code?

I would consider the P2128 trouble code to be very serious. If I am late to work due to the fact that my car is not accelerating properly or stalling on the side of the road, I am not going to be very happy. With that said, I would recommend to anyone that has a P2128 trouble code stored to have the issue handled immediately.

What repairs can fix the P2128 code?

Additional comments regarding the P2128 code?

Do not ever try to manually open the butterfly valve in an electronic throttle body with your hand or any other tool. This can severely damage the electronic throttle body motor and possibly prevent the vehicle from being operational. It is always best to use safe and cautious practices when working with electrical equipment.

Need help with a P2128 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

P2138
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2138 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,796

Rating Summary
4,411
187
47
28
123
4,411
187
47
28
123

Matthew

31 years of experience
633 reviews
Matthew
31 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Williamsburg, Virginia
MATT WAS AMAZING! HE EXPLAINTED EVERYTHING SO WELL! HIS EXPERTISE AS A MECHANIC IS EVIDENT AND I HIGHLY RECOMMEND HIM.

Mario

18 years of experience
101 reviews
Mario
18 years of experience
Lexus LS430 - Check Engine Light is on - Naples, Florida
NICE GUY, COMPLETED ALL WORK PROFESSIONALLY, HE ACTUALLY OFFERED SUGGESTION AND ATTITUDE WAS THAT HE CARED UNLIKE PAST MECHANIC

Kai

12 years of experience
3 reviews
Kai
12 years of experience
Hyundai Sonata - Check Engine Light is on - Plano, Texas
Great. He was knowledgable and wasted no time getting to work. Had lots of helpful information for me

Patrick

31 years of experience
1038 reviews
Patrick
31 years of experience
Mazda CX-7 - Check Engine Light is on - Austin, Texas
Patrick is always on time and extremely knowledgeable and professional. I am quite picky when it comes to somebody working on my car and I fully trust that Patrick will do an excellent job every time.

More related articles

P2202 OBD-II Trouble Code: Nitrogen Oxide Sensor (NOx) Sensor Circuit Low Input Bank 1
P2202 P2202 code definition Nitrogen Oxide Sensor (NOx) Sensor Circuit Low Input Bank 1 What the P2202 code means P2202 is an OBD-II generic code for the engine control module (ECM) on a diesel engine vehicle with a NOx sensor...
P0009 OBD-II Trouble Code: Engine Positions System Performance Bank 2
P0009 P0009 code definition The P0009 code is associated with your engine’s mechanical timing. It may also be accompanied with the codes: P0008, P0010, P0011, P0012, P0013, P0014, P0015, P0016, P0017, P0018, P0019, and many more. What the P0009...
P0299 OBD-II Trouble Code: Turbo / Supercharger Underboost Condition
P0299 code definition P0299 is a generic OBD-II diagnostic trouble code indicating an underboost condition. What the P0299 code means The...

Related questions

Computer reads an issue with the oxygen sensor on a Subaru Forester 1999 2.0 Turbo. What is the problem?

Your 1999 Subaru Forester has pre and post catalytic converter oxygen sensors. The pre-converter sensor optimizes fuel trim while the post converter sensor monitors the efficiency of the catalytic converter. A failing pre-converter sensor will degrade vehicle MPG performance. Although...

2010 Mini Cooper S - P0974 Trouble Code: Shift Solenoid A Control Circuit High

Hello - there are known issues with the valve body wearing out faster than should be normal on this transmission. I would check with a reputable transmission shop in your area for a rebuilt valve body. these are available with...

2008 Buick Enclave engine light on with code p1682 and car stays running with key off for while then dies, ECM is humming,

Code P1682 sets if the ECM detects a difference in the voltage levels of the two main power inputs to the ECM. Basically, the code will be stored when one voltage input has a significantly different value than the other...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com