I change the App on a 2008 Acura tl and the check engine light came back with the same codes p2138 p2122 what else can cause the codes to come back on

AMBER
the car needs service
the throttle by wire is failing.

common this.

https://www.impalaforums.com/threads/p2122-code-accelerator-or-throttle-body.1818978/

DTC P2122: Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage


the means the DEVICE under right foot is bad./
electronic throttle pedal device.

any shop in town can repair this.
no need for dealers.

FRV OR CRV?
FRV IS EUROPE CAR ONLY.
ENGINE REAL NAME: 1.8 L R18A1 I4
SAME ENGINE AS SOME CIVICS HERE, USA
AUTO OR MANUAL TRANS? NOT TOLD
WILD GUESS AUTO?
sm states


Trouble Code Conditions:
APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation
Possible Causes:

• Intermittent failure. Check for poor connections or loose terminals at the APP sensor and the PCM.

Trouble Code: P2138 (1.8L L4 VIN - Auto)
APP Sensor A/B (TP Sensor D/E) Incorrect Voltage Correlation Print this code data so you dont know what APP means.
wall that TBW tech jargon, Throttle by wire.
it is a THROTTLE error.!
that has 3 or 4 TPS sensors and a motor drive to TV
the error means 2 of the sensors do not agree, Correlation error is that.
so is bad TB or bad pedal pots
the service manual tells you the tests with a meter to prove which POT lies .
APP is gas pedal module just above right foot.
TPS TV sensors are inside the TB throttle body, and most times
whole thing is changed out. to fix it. TB
The TB is that things the Air cleaner connects to, on top of engine
it is a large chuck of aluminum .

called TB (classic name)
THROTTLE ACTUATOR and
THROTTLE POSITION (TP) SENSOR
top center of engine , close to fire wall , facing engine.


photo below (civic) shows.
A does not agree with B
A = gas pedal pair of pots
B= TB
my wild guess is pedal module bad.
my guess APP pedal B is bad. and most cheap to buy. (?)

DTC P2122: Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage

Do you know what electronic throttle control is ?


Part 2 Engine Fault no acceleration Case study P2122 P060D

Electronic throttle control !
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

2009 Chevy Silverado P2138 Accelerator Pedal Position


Circuit/System Description
The throttle actuator control (TAC) system uses two accelerator pedal position (APP) sensors to monitor the accelerator pedal position. The APP sensors 1 and 2 are located within the pedal assembly. Each sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit.
Two processors are also used to monitor the TAC system data. Both processors are located within the engine control module (ECM). Each signal circuit provides both processors with a signal voltage proportional to pedal movement. The processors share and monitor data to verify that the indicated APP calculation is correct.

DTC P0455: Evaporative Emission (EVAP) System Large Leak

The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge solenoid valve OPEN and the EVAP vent solenoid valve CLOSED. This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge solenoid valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and vent solenoid valves.

First of all a scan tool is need for this not a code reader, you need to view scan data after you find what code is stored in the PCM. It could have a problem with the powertrain control module, wiring, or the Accelerator Pedal Position (APP) Sensors. Here are a few codes that could set .
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

Hi Rosalee_IM,
The codes your vehicle is storing are for low voltage from your accelerator pedal position sensor and a gross evaporative emission leak. The code P2122 and P2138 are directing you to test the accelerator pedal position circuit and/ or sensor. This is the cause of the reduced power concern you are feeling.The P0455 is telling you there is a large leak in the evaporative emission system. The most common cause for this code is a loose or incorrectly installed gas cap.I hope this helps clarify the concerns you are experiencing. If you'd like more information on how to trouble shoot the problems,drop me a line. Please include the model Impala you have,(LS,LT or LTZ) and the engine size. I will do my best to get back to you as soon as possible.Thanks, Chuck

There is a GM Technical Service Bulletin (TSB) on this issue, below is a summary;

#07-06-04-019A: Intermittent MIL/SES, DTC P2138 with Reduced Engine Power (Repair Instrument Panel (IP) to Body Harness Connector)

Models: 2005-2008 GM Passenger Cars and Light Duty Trucks (Including Saturn)
2005-2008 HUMMER H2
2006-2008 HUMMER H3
2005-2008 Saab 9-7X

Condition

Some customers may comment on an intermittent MIL/SES light Illuminated with a message center or an indicator that displays Reduced Engine Power. DTC P2138 - Accelerator Pedal Position (APP) Sensor 1-2 Correlation may be set. The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for more than a brief period. Refer to DTC P2138 in SI for further diagnostics.

Cause

On some vehicles, the IP to body harness connector, which carries the APP signal to the ECM/PCM, is located in the left hand kick panel area or inside the IP. Water intrusion into these areas could cause an electrical short in the APP circuits setting a P2138 code.

Correction

Note: Make sure that no add-on/aftermarket equipment is electrically connected to the APP signals or to the other ECM/PCM five volt reference or return lines. These can generate false P2138 and/or other ETC System DTCs. If there are other engine DTCs besides P2138, such as MAP sensor faults (i.e. P0107, P0108), resolve these first before attempting to diagnose P2138 DTCs.

Important: Refer to DTC P2138 in SI to confirm that the ETC pedal is operating correctly.

Locate the IP to body harness connector, which may be located in and around the left hand kick panel area or inside the IP. Check to see if there is a water leak into the area and repair as necessary. Use a water hose to determine the source of a water leak and effectiveness of repair. Some examples of potential water leaks are: A-pillar seals, sunroof drain lines (if so equipped) and windshield/cowl sealing. Finally, repair or replace the IP to body harness connector, making sure no corrosion or debris is left on or between the terminals.

Throttle/Pedal Position Sensor/Switch "D" Circuit Low
P2122 - APP Sensor 1 Low Input

Probable Causes:
1 - Failed APP Sensor 1
2 - Open or short circuit condition
3 - Poor electrical connection

----------------------------

P2138 - APP Sensor Performance Condition Fault

Probable Causes:
1 - Failed APP Sensor
2 - Open or short circuit condition
3 - Poor electrical connection
I hope this helps you and thank you

i have a 2004 acura tl an is giveing me code p2138

Press odometer reset/adjustment shaft in, hold in and turn key to run position. Keep holding in the reset shaft in for about 30 seconds. release shaft. turn key off. restart car. Service Light should go off in about 5 seconds.