Skip the auto shop - Our mechanics make house calls

P2118 OBD-II Trouble Code: Throttle Actuator Control Motor Current Range/Performance

Check Engine Light

P2118 code definition

The P2118 code is a general OBD-II diagnostic trouble code (DTC) that is referencing the throttle actuator control motor current / performance. This code may be seen with other throttle position sensor codes.

What the P2118 code means

The throttle actuator control motor is used on cars with electronically controlled throttle bodies also called drive-by-wire. On these systems, the gas pedal is a sensor that sends a signal to the throttle actuator control motor which opens and closes the throttle plate according to demand.

When the engine control module (ECM) detects out-of-range voltage or poor performance from the throttle actuator control motor, the P2118 code is set along with a Check Engine Light on the dashboard. When the P2118 code is set, it also triggers a failsafe mode to prevent damage to the vehicle. The failsafe mode will remain until normal operation is found or until the fault is resolved.

What causes the P2118 code?

These are the most common causes of the P2118 code:

  • Throttle actuator control motor failure
  • Failed pedal position sensor
  • Throttle position sensor faulty
  • Open or short in the actuator circuit
  • Poor electrical connection

What are the symptoms of the P2118 code?

The P2118 code can have some rather serious symptoms. The worst being the car not responding at all if the gas pedal is depressed due to the failsafe mode. Other possible symptoms are an engine misfire, poorly running engine, lack of power, and the Check Engine Light being illuminated. In some cases, the Check Engine Light may not be seen until after the symptoms start.

How does a mechanic diagnose the P2118 code?

Qualified technicians will begin by using a scan tool to check for any codes stored in the vehicle's ECM. All the codes will be noted including the codes stored in its history and codes that may be pending. Each code will also have freeze frame data associated with it which tells technicians what the vehicle conditions were when the code was set and which code was set first.

All codes will then be cleared and a test drive performed. Upon returning from the test drive, the technician will check that the P2118 code is present again.

Next, a visual inspection will be performed looking for any obviously failed components or damaged wiring. Then, the scan tool will be used to monitor the data stream and check the throttle and gas position sensor values as they are operated. A multimeter will then be used to check for voltage at the throttle actuator control motor.

Lastly, the air intake will be removed and the throttle body will be inspected to see if the throttle plate is capable of moving.

Common mistakes when diagnosing the P2118 code

Mistakes can easily be made when simple steps such as the visual inspection are overlooked. The repair could be as simple as finding a frayed wire and repairing it. All steps must be followed in the proper order and completed in their entirety.

How serious is the P2118 code?

The P2118 code can prevent the vehicle’s throttle from operating, which can cause some serious problems. The car may not drive or move after symptoms start, so extreme care should be taken and the vehicle should not be driven if drivability concerns are present.

What repairs can fix the P2118 code?

Generally, simple repairs such as these fix the P2118 code:

Additional comments for consideration regarding the P2118 code

An advanced-level scan tool is very important for accurately diagnosing the P2118 code. These scan tools allow technicians much greater access into the vehicle's ECM. Basic scan tools are only able to clear codes and show the current codes. The advanced scan tools allow access to the live data stream which displays useful sensor data in ways that otherwise would not be available.

Need help with a P2118 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 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

How Long Does a Vacuum Brake Booster Check Valve Last?
The braking system on your car requires a lot of pressure. The vacuum booster is one of the main sources of this pressure. This booster will take the pressure that...
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...


Related questions

Q: DTC Help Request

You might have a problem with fretting corrosion in the connectors of the modules of the vehicle. There is a technical bulletin out for your Saturn VUE: 09-06-03-004D, dated December 2010 for corrosion in the small connector pins of the...

Q: Always trying to figure out why warning lights are on, what’s actually wrong?

The first thing I would recommend is to have YourMechanic come to you since you cannot go over 40 mph and do a thorough diagnostic check for the issues you are having. The lights on the dash all have a...

Q: Park assist issues

Hi there, thanks for writing in. I'd be happy to provide my insight. I have seen this happen with the same errors when the object detection module is faulty. The "incompatible equipment on sensor" code relates to the fact that...