P2105 OBD-II Trouble Code: Throttle Actuator Control System - Forced Engine Shutdown

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2105 code

P2105 is a diagnostic trouble code (DTC) for "Throttle Actuator Control System - Forced Engine Shutdown". 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 for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P2105 DIAGNOSTIC Get a fair and transparent estimate upfront

P2105 trouble code definition

Throttle Actuator Control System (TAC) - Forced Engine Shutdown

What the P2105 code means

This code is set when the PCM (Powertrain Control Module) has failed or the PCM has detected one or more problems that could result in a safety issue from incorrect throttle control. The throttle actuator on modern vehicles is electrically controlled. There isn’t a direct connection between the throttle pedal at your foot and the throttle valve.

It is possible the PCM could open the throttle valve and cause the vehicle to accelerate dangerously against the driver's commands. For this reason, the PCM follows some very strict guidelines to insure the system is operating correctly. If these guidelines are not met, the PCM places the car in a default forced engine shutdown mode for safety reasons.

What causes the P2105 code?

This code is set when the correlation between the throttle pedal and the throttle valve don’t match. The PCM determines this by monitoring the resistance and or voltage of sensors mounted on the throttle pedal and the throttle valve. If the position of these two sensors don’t match, the vehicle is put into a safe mode that will either turn the motor off or only allow it to idle. This depends on the programming the manufacturer chooses to use.

The data from other systems is used when calculating throttle position. If any of these systems has problems, the PCM’s throttle position calculations can be compromised, therefore putting the vehicle in this default safety mode and setting this code.

What are the symptoms of the P2105 code?

  • The vehicle will die and will not start
  • The Check Engine Light will be on
  • The car will idle but won’t go

How does a mechanic diagnose the P2105 code?

This system is fairly simple in its design, but because of the programming involved, it can be difficult to diagnose. The first step is to connect a scanner and look for any data that looks incorrect. This could be a crank sensor, camshaft sensor, TPS at the throttle valve, throttle pedal sensor at the throttle pedal, PCM, wiring harness problem, MAF (Mass Airflow Sensor), MAP (Manifold Absolute Pressure) sensor and several other possibilities.

It’s important the technician has a firm understanding of each of these systems to enable him or her to recognize problems that can affect the TAC system. For this reason, most other DTC’s (Diagnostic Trouble Codes) should be diagnosed first as they could contribute the the malfunction of the TAC system and set this code.

Common mistakes when diagnosing the P2105 code

Due to the amount of systems that can affect the TAC system, it is excessively easy to miss something going on with other systems that will affect the TAC system. It’s important to understand this code is set when the vehicle enters a default mode for safety reasons.

Anytime a fault is present that can affect the throttle control, the vehicle enters into a safe mode to insure the vehicle doesn’t accelerate out of control.

How serious is the P2105 code?

The code itself isn’t serious. It merely states that the vehicle has been put into a default safety mode. Although the code exists for the safety of the occupants and therefore suggests there is the possibility the vehicle could become out of control if it isn’t placed in this safety mode.

What repairs can fix the P2105 code?

Additional comments for consideration regarding the P2105 code

When this code is set depends greatly on the programming choices of the manufacturer. Since modern vehicle computer systems utilize the PCM to control almost every function, it is very common that other systems outside the TAC (Throttle Actuator Control) system will affect the PCM’s control of the TAC system. In the interest of safety and the risk of an out of control vehicle due to sudden uncontrolled acceleration, manufacturer’s default the engine to shut down for obvious safety reasons.

Need help with a P2105 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.

Check Engine Light
trouble codes
P2105

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2105 code.

SCHEDULE P2105 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


Related questions

P0605 & p2105
Hello, thank you for writing in. Lets take a look at these codes separately at first. The P0605 codes stands for a malfunction with the main computer's (PCM-power train control module) ROM (or "Read Only Memory"). The P2105 is then...
After replacing valve cover gaskets, car runs horrible, and throws 5 different codes.
Hi there. Look on the engine for any ground wires. There could have been a ground wire that was disconnected to remove the valve covers causing all of the codes to appear. A ground that is not hook up can...

More related articles

P0488 OBD-II Trouble Code: Exhaust Gas Recirculation Throttle Control Circuit "A" Range/Performance
What What the P0488 code means The Powertrain Control Module (PCM) has discovered a problem with the rate of flow of the exhaust gas recirculation (EGR) system. What causes the P0488 code? There are a few potential causes for the...
P0281 OBD-II Trouble Code: Cylinder 7 Contribution/Balance Fault
P0281 P0281 code definition The generic trouble code P0281 indicates cylinder 7 contribution/balance fault. What the P0281 code means The P0281 code means that cylinder 7 in the firing order of your cylinders is having an issue related to the...
P0287 OBD-II Trouble Code: Cylinder 9 Contribution/Balance Fault
P0287 P0287 code definition A P0287 Trouble Code indicates cylinder 9 contribution/balance fault. What the P0287 code means In the event of a P0287 code appearing and storing in the vehicle, it means that there is an abnormal reading in...

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 (855) 347-2779 · hi@yourmechanic.com