Accelerator pedal position sensor

What engine does it have ?
Engine Controls - 2.2L (L61)
Engine Controls - 3.0L (L81)

Your vehicle does not have a idle air control valve , don't know how you came up with that .(code reader ? ) Your vehicle has what is called drive by wire - electronic throttle control . Or as GM calls their system TAC - throttle actuator control .

Throttle Actuator Control (TAC) Overview
The throttle actuator control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. This eliminates the need for a mechanical cable attachment from the accelerator pedal to the throttle body. This system also performs the cruise control functions as well.
The TAC system components include, but are not limited to, the following:
• The accelerator pedal position (APP) sensors
• The throttle body assembly
• the engine control module (ECM)
The APP sensors and the throttle body assembly provide inputs to the ECM to ensure accurate calculations and control of the TAC system.
Accelerator Pedal Position (APP) Sensor
The APP sensor is mounted on the accelerator pedal assembly. The APP is actually 2 individual APP sensors within 1 housing. These are 2 separate signal, low reference, and 5-volt reference circuits. The APP sensor 1 voltage increases as the accelerator pedal is depressed. The APP sensor 2 voltage also increases as the accelerator pedal is depressed, but the voltage range for sensor 2 is approximately half of sensor 1.


Your best bet mite be to take it to a qualified repair shop that has the right diagnostic tools to find the problem .

https://www.youtube.com/watch?v=x4xcQSRAgFI

https://www.youtube.com/watch?v=oPPLAHSSluw

code p 2176 refers to throttle actuator control(TAC) system--idle position not learned ===causes basic setting not carried out
code p 1795 is CAN bus--throttle body position
code p 1780 is park/neutral position (PNP) switch circuit engine torque signal circuit
code p 1779 is engine torque delivered to TCM signal
go google and type in cadillac fault codes and find a site that has all the codes listed

Camshaft/Crankshaft Position Sensor Replacement - Cadillac Forums

www.cadillacforums.com/.../261074-camshaft-crankshaft-position-senso...

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2004 Cadillac DTS crankshaft position sensors - YouTube

? 3:22
https://www.youtube.com/watch?v=jbjLJZzF3xA
Sep 16, 2013 - Uploaded by Rogelio Cervantes
Quick overview crankshaft position sensor replacement for a 2004 Cadillac DTS 4.6 liter North Star. ... 2003 Cadillac CTSCrank Position Sensor Part 3 Done!!! - Duration: 8:21. 2LateIWon 8,433 views. 8:21. How To Check .

On the gas pedal assy

Not the problem

Move on to other issues

Need a scan tool to check modules

Camshaft position sensor A circuit range /performance bank 1 or single sensor

You have to Google those codes

Put in your vehicle

2003 Cadillac CTS OBD2 Code P2176

No messaage of reduced engine power ? Your vehicle has electronic throttle control . Has four position sensors , two are located in the gas pedal ,an two in the throttle body . The PCM uses these sensor to know how much to open the throttle plate ,allowing more air into the engine . How did you read this code an where did you read it's definition at ? This is not a code for your vehicle . Some time cheap code readers get them wrong .
DTC P2120: Accelerator Pedal Position (APP) Sensor 1 Circuit
DTC P2122: Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage
DTC P2123: Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage
DTC P2125: Accelerator Pedal Position (APP) Sensor 2 Circuit
DTC P2127: Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
DTC P2128: Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage
DTC P2138: Accelerator Pedal Position (APP) Sensor 1-2 Correlation

DTC P1516: Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P2101: Throttle Actuator Position Performance
DTC P2119: Throttle Closed Position Performance
DTC P2176: Minimum Throttle Position Not Learned

If one of this position sensors is bad it will throw the PCM into a
Reduced Engine Power Mode
When the ECM detects a condition with the TAC system, the ECM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
• Acceleration limiting--The ECM will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.
• Limited throttle mode--The ECM will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
• Throttle default mode--The ECM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
• Forced idle mode--The ECM will perform the following actions:
- Limit engine speed to idle by positioning the throttle position, or by controlling the fuel and spark if the throttle is turned off.
- Ignore the accelerator pedal input.
• Engine shutdown mode--The ECM will disable fuel and de-energize the throttle actuator.


017 Accelerator Pedal Position Sensors
Drive by Wire Function and diagnostics by Wells

Cam crankshaft position sensor b bank 1

the translation isnt very good but i think from the codes you need a new throttle position pedal sensor ,its the one on teh throttle pedal under the dash ,the other codes have no meaning to me as they are B codes and these would only show on a dealer diagnostic machine so iam surprissed you have managed to extract these codes ,so i assume you have visited a chinese web site to buy some of their lovely pirate software ,iam saving up for mine with the earnings from this web site