Question about 2005 Chevrolet Tahoe

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Just had 2003 tahoe 5.3 throttle body cleaned, now no cruise control?

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Sound like the cruise control linkage wasn't reconnected to the throttle body

Posted on Sep 03, 2010

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Posted on Jan 02, 2017

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2003 Yukon Denali XLT lights flicker, rpm goes up and down when on park or stopped or driving and slow speeds. Sometimes it turns off. I thought it might be bad spark plugs or cables so I changed them and...


Your vehicle has electronic throttle control . Position sensor's in the gas pedal an the throttle body , inputs to the Throttle Actuator Control Module
The TAC module is the control center for the throttle actuator control system. The TAC system is self-diagnosing and provides diagnostic information to the PCM through a dedicated serial data line. The TAC achieves throttle positioning by providing a pulse width modulated voltage to the TAC as directed by the PCM.

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 components include the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• The throttle actuator control module
• The powertrain control module (PCM)
Accelerator Pedal Position (APP) Sensor
The accelerator pedal assembly contains 2 individual APP sensors within the assembly. The accelerator pedal position (APP) sensors 1 and 2 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 control module provides each APP sensor a 5-volt reference circuit and a low reference circuit. The APP sensors then provide the control module with signal voltage proportional to pedal movement. APP sensor 1 signal voltage is low at the rest position and increases as the accelerator pedal is applied. APP sensor 2 signal voltage is high at the rest position and decreases as the accelerator is applied.
Throttle Body Assembly
The throttle body assembly consists of the throttle body, the throttle position (TP) sensors, and the throttle actuator motor. The throttle body functions similar to a similar to a conventional throttle body with the following exceptions:
• An electric motor opens and closes the throttle valve.
• The throttle blade is spring loaded in both directions and the default position is slightly open.
• There are 2 individual TP sensors within the throttle body assembly.
The TP 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 TP sensors are used to determine the throttle plate angle. The control module provides each TP sensor a 5-volt reference circuit and a low reference circuit. The TP sensors then provide the control module with signal voltage proportional to throttle plate movement. Both TP sensor signal voltages are low at closed throttle and increase as the throttle opens.

Flickering light's could be caused by a bad diode in the alternator . Fluctuating idle could be caused same alternator problem or dirty throttle plate.
Throttle Body Cleaning To Restore Idle Quality

Jul 15, 2017 | 2003 GMC Yukon

1 Answer

My battery wouldnt hold a charge, changed battery and now idles low cruise control quit working and code port doesnt work to get code. Sounds like its missing now,changed battery 2 weeks ago and problems...


Are all your "idiot lights" on? I had the same symptoms, turned out to be a bad coil on one of the cylinders. Cost is about $80 for the coil, very easy to change. So, my advise would be to check your coils. Also, make sure you clean your throttle bottle, especially after a battery change. If not, will cause problems with idle, especially if the A/C is on.

Throttle body: unhook your battery, clean the throttle body with carb cleaner. Hook battery back up, and drive it for 5 miles or so, so the computer re-sets.

Nov 17, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

When i turn on heater or fan engine revs over 3000 rpm


Idle Air Control Valve Pintle may be bad If you disconnect the IAC and the problem ceases it can point to this being the problem.: Removal & Installation 3.5L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove the fuel injector sight shield.
  3. Drain the cooling system.
  4. Remove or disconnect the following:
    • The air cleaner intake duct. Figure of IAC and TPS electrical connectors disconnected. aurora_g1.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of cruise control and throttle control cables removed from throttle lever. aurora_g2.gif

    • The cruise control cable and throttle control cable from the throttle body lever.
    • The fuel pressure regulator vacuum hose, positive crankcase ventilation (PCV) hose and the throttle body vacuum port hose.
    • The throttle body coolant hoses.
    • The throttle control cable bracket, leaving the throttle and cruise cables connected.
    • The upper nut holding the throttle body to the intake manifold.
    • The throttle body assembly.
  5. Clean the gasket mating surfaces.
To Install:
  1. Install a new gasket and new studs if necessary.
  2. Install or connect the following:
    • The throttle body assembly.
    • Start the top nut by hand.
    • The throttle body coolant hoses.
    • Position the throttle control cable bracket and hand start the retaining nuts and bolt.
    • Torque the three throttle body retaining nuts to 89 in.lbs. (10 Nm). And the bracket retaining bolt to 115 in.lbs. (13 Nm).
    • The throttle body vacuum port hose, PCV valve hose and the fuel pressure regulator hose.
    • The throttle control and cruise control cables to the throttle body lever.
    • The IAC valve and TP sensor electrical connectors.
    • The air intake duct.
  3. Refill the cooling system.
  4. Install the fuel injector sight shield.
4.0L Engine To Remove:
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Relieve the fuel system pressure.
  3. Remove or disconnect the following:
    • Negative battery cable.
    • The Mass Air Flow (MAF) sensor electrical connector.
    • The air cleaner intake duct.
    • The PCV valve fresh air tube. Figure of cruise control cable removed from throttle cable bracket. aurora_g3.gif

    • The cruise control cable and throttle control cable from the bracket.
    • The cruise control cable and throttle control cable from throttle body lever. Figure of IAC valve and TPS connectors removed. aurora_g4.gif

    • The idle air control (IAC) valve and throttle position (TP) sensor electrical connectors. Figure of fuel lines removed from retainer on throttle cable bracket. aurora_g5.gif

    • The fuel feed and return lines from the retainer on the throttle control cable bracket.
    • The transaxle shift cable clip from the throttle control cable bracket. Figure of throttle body removed from water crossover. aurora_g6.gif

    • The throttle body from the water crossover.
To Install:
NOTE: The Mass Air Flow (MAF) sensor inlet and the outlet of the air cleaner assembly must line up when installed. Misalignment may cause MIL illumination or driveability concerns.
  1. Install or connect the following.
    • The throttle body to the water crossover. Torque the bolts to 106 in.lbs. (12 Nm).
    • The IAC valve and TP sensor electrical connectors.
    • The throttle and cruise control cables to the throttle body lever.
    • The throttle and cruise control cables to the throttle control cable bracket. The transaxle shift cable clip to the throttle control cable bracket.
    • The fuel feed and return line retainer to the throttle control cable bracket.
    • The MAF sensor electrical connector.
    • The air cleaner intake duct clamp. Torque the clamp to 27 in.lbs. (3Nm).
    • The PCV valve fresh air tube.
    • The fuel injector sight shield. Torque the nuts to 20 in.lbs. (2.3 Nm).
  2. Install the negative battery cable.
  3. Pressurize the fuel system and verify no leaks.
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Oct 07, 2010 | 2001 Oldsmobile Alero

2 Answers

2005 chevy tahoe cruise control not working, no blown fuses


The BRAIN BOX which is known by most car owners controls the throttle boy accellerations control when engaging the cruise control on. If your fuses are good I recomend have the servo (brain box) checked

Jan 23, 2010 | 2005 Chevrolet Tahoe

2 Answers

My 2003 Ford Escapes gas pedel sticks when you try to take off.


The most common reason for this is a buildup around the butterfly valve in the throttle body. Under the hood, find the intake hose that runs from the air cleaner box to the intake of the engine. Remove the hose from the throttle body.

On the inside of the throttle body, you will see the butterfly valve which opens when you press the gas pedal. Clean the throttle body with a suitable cleaner such as Throttle Body Cleaner, which can be found at your local parts store. An old toothbrush and rags work well for cleaning the valve and behind the valve. Dry everything up and reassemble.

Other reasons could be sticking linkages at the throttle body that actuate the butterfly valve, or something as simple as your floor mat catching the pedal when depressed.

Jan 01, 2010 | 2003 Ford Escape

2 Answers

I have trouble code p1516 , the truck will stall ocassionally after it stalls i crank it up and it does fine


DTC P1516 Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance

Your vehicle has an electronic throttle body unit so it uses voltage signals to control throttle blade in the throttle body. There are a few different issues that can cause this problem.

First off there is a update for the PCM to address those codes, but you will have to take it to the dealer for that.

Second there is issues with the actuator on the throttle body binding up and causing the codes.

Third there is a yellow wire coming off the throttle body connector that breaks inside internally and cannot be seen to the naked eye. The best way to test that is to grab the wire about 5 inches from the connector and tug if it feels spongy or breaks, that’s your problem.

Fourth there is a ground at the back of the passenger side head that becomes loose.

Dec 02, 2009 | 2003 Chevrolet Tahoe

1 Answer

Crusie control


the cruise control is run by the input and output speed sensors on your transmission these speed sensors tells the pcm vehicle speed and engine rpms this in turn adjust the cruise control module to adjust throtle via cable to the throttle body.

Sep 17, 2009 | 2003 Dodge Durango

1 Answer

2003 tahoe idle surges when starting engine. lasts for few minutes, then OK. any answers.


sounds like idle air control clean the throttle body & try again, might have to do a few times as the npintle inside the iac might be stripped.

good luck

Sep 10, 2009 | Chevrolet Tahoe Cars & Trucks

1 Answer

Cruise control not working on 2003 chevrolet tahoe


If the brake swith on the pedal has a short it could be disengaging the cruise.

Sep 02, 2009 | 2003 Chevrolet Tahoe

1 Answer

2003 impala stuck accelerator..


THE TROTTLE PLATE INSIDE THE THROTTLE BODY WILL GET DIRTY AND THE IDLE WILL NOT COME DOWN TO NORMAL.U CAN CLEAN IT W/ A THROTTLE BODY CLEANER U CAN BUY AT ANY PARTS STORE

May 15, 2009 | 2003 Chevrolet Impala

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