Question about Chevrolet Silverado 2500HD

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I have a 04 hd2500 reduced power problem,my mechanic put accelorator sensor then a throttle body. then the wiring harnes for tb, and i still have reduced power problem. help!!!

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Try wiggling the wires in the accelorator sensor connector.sometimes the wires break inside the insulation and it is real hard to find.they usually break from 1 to 4 inches from the connector.if you dont find the problem there i would disconnect the computer and see if there is corrosion in the connectors.i have seen this happen to.hope this helps.good luck.

Posted on Mar 30, 2011

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Posted on Jan 02, 2017

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I have an isuzu kb 240 petrol manual transmission . I had a new throttle body installed and sensors on throttle body, now its batling to start and when it starts it does not seem to pik up revs ?


wow no year and asks for help, wow to the 10th power
welcome to USA forum
the country that has zero, KB trucks here.
not a single one.
or books to match,
what does"had "mean.
a certified mechanic put it on and skipped all other steps in the book for that?
?

no statement aLL why new TB
NO STATEMENT OF HOW IT RAN BEFORE
AND WHY NEW TB.?

Feb 06, 2017 | Isuzu Cars & Trucks

2 Answers

I just got my alternator fixed then i started having the ESC serv ice light come on, and the trac symbol comes up and the engine light flashes. and the power is reduced and it jerks when driving


its possible that the incorrect voltage regulator was fitted to the alternator during the repair. A low voltage or irregular voltage from the alternator can cause havoc with vehicle electronics

Aug 02, 2016 | 2009 Chevrolet Malibu

1 Answer

Check engine light reduce engine power and traction controll off.


It could be the APP sensors or the throttle body throttle position sensors . What DTC'S - diagnostic trouble codes . Need to test the electrical wiring , 5 volt reference voltage. Drive by Wire Function and diagnostics by Wells
REDUCED ENGINE POWER - mass airflow sensor has nothing to do with this problem .
Throttle Actuator Control (TAC)
Reduced Engine Power Mode When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
?€¢
Acceleration limiting--The control module will continue to use the accelerator pedal for throttle control; however, the vehicle acceleration is limited.


?€¢
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.




Refer to
?€¢
Powertrain Control Module Description for the 4.8L, 5.3L and 6.0L engine


May 09, 2016 | 2006 Chevrolet Avalanche

1 Answer

When I push my gas pedal down about one inch the reduced power light comes on it don't stall just reduced power you shut the truck off restart it the light is off ,


The reduced power light is pertaining to the TAC - electronic throttle control . Is the check engine light lit ? If not still may have a DTC -diagnostic trouble code stored . You probably have a bad TPS - throttle position sensor .
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the powertrain control module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.

Dec 31, 2015 | 2002 Chevrolet Chevrolet TrailBlazer EXT...

1 Answer

Gm code p2120


Code p2120 is accelerator pedal position sensor APP sensor 1 circuit apparently this is known as the reduced engine power syndrome and is quite common on the avalanche. There is no mechanical linkage from gas pedal to throttle body and it is quite common for the throttle position sensor located on throttle body to mess up and throw this code and also for one of the wires to the throttle position sensor to get hot become brittle and sometimes break. I would start there

Aug 04, 2014 | 2003 Chevrolet Avalanche

1 Answer

Check stabilink system and engine power reduced messages


Try cleaning the throttle body first !!! Be sure to use "THROTTLE BODY" cleaner, and NOT " CARBURETOR " cleaner !!! (( DO NOT GET CLEANER ON ELECTRICAL PARTS OR CONNECTORS. VERY IMPORTANT !!!))

Mar 07, 2014 | 2010 Chevrolet Impala

2 Answers

Check Engine Light & Dashboard Reads Reduced Engine Power


The reduced engine power happens because there is a problem with the electronic throttle control . Some people call it drive by wire ! The gas pedal has sensors inside , position sensors , connected electrical to the PCM - engine computer , the throttle body on the engine has a DC electric motor an also has position sensors . These are also connected to the PCM electrical . The PCM reads the position sensors which indicate how much your pressing on the gas pedal . then hopefully it opens the throttle the same amout .

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)

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.

GM Electronic Throttle Body Circuit Descriptions And Testing Tips

Tons of videos on youtube for these systems , there can be a variety problems , from wiring , worn out sensors , the DC motor , computer etc....

Jun 20, 2017 | 2007 Chevrolet Uplander

4 Answers

Fault Code P2135


04 chev 2500hd 6liter gives code p2135 replaced pedal pos. sensor still giving code only does when goes to high rpm when goes in passing gear volts drop and goes to reduced engine power

May 21, 2008 | 2006 Suzuki Forenza

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