My mechanic actually referred me to dealer-service on this after he replaced the throttle postion sensor and the problem did not go away. Dealer-service claimed they identified the problem and apparently charged me to not fix it. They replaced the throttle position sensor again, stating the part my mechanic used was not a genuine GM part...
It is an intermittent problem. It happens either in motion or at a stand still. Road conditions do not seem to be a factor.
A combination of low traction and/or no traction dash lights followed by engine revving and what feels like the trans not being able to shift between gears. Can last for as little as 5 minutes or as long as 20 minutes.
Dealer-service receipt states: "Scanned for DTCS found P0105, P0122, P0440, P0452, P0730. Codes lead to throttle position sensor, was able to duplicate concern. Replaced throttle position sensor, cleared codes and rechecked."
I picked the car up Sat. from dealer-service and this morning - same problem. Any thoughts? Suggestions?
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Your best bet would be to take your vehicle to a qualified repair shop that knows how to test an not guess as to the problem . Having control modules checked for DTC's - diagonstic trouble codes should always be the first step diagnosing modern automobiles . Replacing parts is not the way to try an fix your car. Would hate for you to replace a part an not have it fix the vehicle . Engine power reduced is associated with the electronic throttle control , no speed sensor .
ENGINE POWER REDUCED
Throttle Actuator Control (TAC) System Description for 3.6L engine or Throttle Actuator Control (TAC) System Description for the 2.4L engine
The engine control module (ECM) is the control center for the throttle actuator control (TAC) system. The ECM determines the driver's intent based on input form the accelerator pedal position sensors, then calculates the appropriate throttle response based on the throttle position sensors. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle actuator motor. The throttle blade is spring loaded in both directions, and the default position is slightly open. 002 Electronic Throttle Operation Drive by Wire Function and diagnostics by Wells
Reduced power mode will cause traction control system to be shut off turning on the light . Nothing wrong with traction control.
So do yourself a favor an take it to a GM dealer or someother qualified repair shop .
DTC P2138: Accelerator Pedal Position (APP) Sensor 1-2 Correlation
Electronic throttle control problem .
The throttle actuator control (TAC) system delivers improved throttle response and greater reliability and eliminates the need for mechanical cable. The TAC system performs the following functions:
• Accelerator pedal position sensing
• Throttle positioning to meet driver and engine demands
• Throttle position sensing
• Internal diagnostics
• Cruise control functions
• Manage TAC electrical power consumption
The TAC system includes the following components:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The engine control module (ECM)
Accelerator Pedal Position (APP) Sensor
The accelerator pedal contains 2 individual accelerator pedal position (APP) sensors within the assembly. The APP sensors 1 and 2 are potentiometer type sensors each with 3 circuits:
• A 5-volt reference circuit
• A low reference circuit
• A signal circuit
The APP sensors are used to determine the pedal angle. The engine control module (ECM) provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors provide the ECM with signal voltage proportional to the pedal movement. The APP sensor 1 signal voltage at rest position is less than 1 volt and increases to more than 4 volts as the pedal is actuated. The APP sensor 2 signal voltage at rest position is less than 0.6 volt and increases to more than 2 volts as the pedal is actuated.
Search P2138 on youtube ,will show diagnostic steps .
It's usually the sensor inside the wheel hub or the wiring harness to the brake controller. The service traction light will set a trouble code. If your mechanic is stumped, authorize him to call a GM tech support line. The call is $50, but the GM tech support can help him figure out what's wrong.
This is a common problem with GM's. The TPS sensor goes bad in the throttle body. Throws out a message to service Stabilitrac. Not SO!!!
The kicker is that the whole throttle body has to be replaced because the TPS sensor is actually part of the throttle body!!! Costs around $250.00 for aftermarket.
The ESP light refers to your car's traction control. The loss of power you feel is the car throttling back in an attempt to regain normal traction conditions. This is by design but if you car is flashing ESP under normal driving conditions, you most likely have an ESP sensor problem and should have it checked at the dealer.
i have chevy equinox 2007 LT with AWD system, my problem is that i have two messages appearing in the DIC : satbilitrack and service tracktion control. can u help me with this and tell me whats the problem and how should i fix it?
If the car shudders all the time stopping it could be a rotor out of round sometime this happens with new rotors, they should replace them under warranty. But if it is more like abs shudder then they could have damaged a sensor at one of the wheels, the sensors are used for abs and traction control.
If your trac and abs are both on. the problem could be a wheel speed sensor.
on some GM cars this sensor is built into the vehichles hub unit. making the bering and sensor one sealed unit. cheap hub units can be gotten (under 100 bucks) at autozone
It sounds like these things are all related. When the a computer sees a problem in the Electronic throttle system, it will dissable traction control, and give the reduced engine power alert because the powertrain computer does not know the value of throttle postion.
Codes will need to be scanned in the computersto begin diagnosis.