Question about 2003 Chevrolet Tahoe
Have replaced accelerator assembly, throttle body and battery to no avail.
Assuming you do not do your own vehicle
diagnosing & work,then the folks that do, failed
to even find a problem
The APP,ETC,gas pedal or whatever name you want to
call them, are very redundant,they can be checked with scan
tool & component tested & seldom fail
Throttle Bodies get replaced a dime a dozen, because no
one knows how to test the circuits or the motor on them & it usually
is not the problem either
Shops,Mechanics,Dealers all use codes & guessing, out of frustration for an answer to those type problems
They need to spend an hour or more on the internet,in their data
base,checking bulletins & learn the system, before even going to
the vehicle, then bill you for that time & continue to work on finding
the vehicles problems with their new found education.
I will bet you can find lots on a 2003 Tahoe Reduced Engine
Power & the Codes just using Google.
So why can't the repair shops,not like they never had one
in the shop before.
You may even find the solution on You Tube Video in a live
repair shop video on the subject
Posted on Mar 27, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: check engine lite is on,
Your CODE P1276 refer to the Acelerator Pedal Position, Sensor 1 Circuit Range Performance.
Probable cause: Wiring, APP or ECM
GM - P1271 Accelerator Pedal Position Sensor 1-2 Correlation
I also found this... though its for Trailblazers... but may give you a clue:
Reduced Engine Power Message and/or Check Engine Light with any Combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 #PIP3192 - (Oct 18, 2004)
Reduced Engine Power Message and/or Check Engine Light with any Combination of the Following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682 PCM Repeat.
The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.
Reduced engine power message and/or check engine light with any combination of the following DTCs: P0107 P0112 P0122 P0452 P1120 P1220 P1221 P1271 P1275 P1280 P1481 P1515 P1540 P1633 P1635 P1639 P1682
If the SI diagnostics did not isolate a concern, the following information may be helpful:
- Inspect the main engine wiring harness between the PCM and the generator assembly for a potential short to ground. There is a metal wiring harness retainer in this area that secures the main engine harness. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the harness retainer. This may eventually cause the exposed circuit to short to ground.
- Inspect the 3 harnesses that connect to the PCM for potential shorts to ground on the metal PCM mounting bracket, just below the PCM. There are plastic harness retainers on the PCM bracket that secure the harnesses to the PCM bracket. If the harness conduit is mispositioned, some of the wiring may become exposed and chaff on the PCM bracket. This may eventually cause the exposed circuit to short to ground.
- If a chaffed circuit is found in either of the above locations, repair the circuit using the necessary SI procedures. Once the circuit is repaired, tape the area of the affected area of the harness to prevent the wires from becoming exposed in the future and secure the harness using the original harness retainer.
This applies to 04:
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128 - kw low MIL pedal power reduced #PI01746 - (Feb 17, 2004)
- 4.2L 5.3L LL8 LM4 Engine with DTC - P2120 or P2122 or P2123 or P2125 or P2127 or P2128.
When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.
MIL light on. Reduced Power message on DIC. Possibles DTCs P2120 and/or P2122, P2123, P2127, and P2128.
The APP harness is clipped to the accelerator pedal bracket. The harness may chaff on the upper portion of the accelerator pedal causing a short to ground. Verify the harness is not chaffing on the accelerator pedal. After repairing the short, reposition the harness to ensure no contact between the harness and the accelerator pedal.
Posted on Feb 09, 2010
I'd bring it back to the shop that put in the throttle body and have them check to see if the replacement was defective or failed. If not, you may have a bad throttle position sensor [part of the gas pedal] I'm assuming it worked fine for a while after the repairs with no problems then suddenly started acting up again. I've replaced a bunch of throttle bodies but only one position sensor so far. There's always the chance that there's a bad wire somplace or some other more exotic problem but I'll bet you'll find it at either the sensor or throttle body. Good luck, hope this helps!
Posted on Aug 01, 2010
SOURCE: p2135 code reduced power light
Thats a throttle body code p2135 that and p2101 unfortanatly are saying that the whole throttle body needs to be replaced do to an electronic malfuntion that is not a serviceable part or sensor.
Posted on Jan 04, 2011
SOURCE: keep getting po102 if using
if the problem for p0102 was repaired & the ck engine lamp is off then i would'nt be
concerned. the computor will erase code from its memory after it does'nt see the problem
any more.it will store in history codes for awhile
Posted on Jun 22, 2011
Testimonial: "stayed with problem untill repair was complete. showed knowledege and desire to fix the problem. Thanks"
Tips for a great answer:
Limited throttle mode--The control module will continue to use the accelerator pedal for throttle control; however, the maximum throttle opening is limited.
Throttle default mode--The control module will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
Forced idle mode--The control module will perform the following actions:
Limit engine speed to idle by positioning throttle position, or by controlling fuel and spark if throttle is turned off.
Ignore accelerator pedal input.
Engine shutdown mode--The control module will disable fuel and de-energize the throttle actuator.
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine
May 09, 2016 | 2006 Chevrolet Avalanche
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.
Did you have it checked for DTC's - diagnostic trouble code's related to the reduced engine power ?
All so has APP sensor gas pedal !
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.
Your best bet is take your vehicle to the dealer !
May 03, 2016 | Cars & Trucks
Jun 22, 2015 | 2005 Chevrolet Chevrolet Malibu MAXX LS
May 04, 2015 | 2003 Chevrolet Chevrolet TrailBlazer
May 12, 2017 | 2004 GMC Sierra Denali
May 25, 2017 | 2006 GMC Canyon
May 21, 2017 | Chevrolet Avalanche Cars & Trucks
Jan 06, 2011 | 2003 Chevrolet TrailBlazer
Jun 20, 2017 | 2007 Chevrolet Uplander
78 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: