Question about 2007 Chevrolet Silverado 2500HD

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Check engine light came on with a message stating reduce engine power. what is the main issue that will cause this message to come on?

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Most times a plugged fuel filter if your truck is a diesel, on the gas engine I have found the yellow wire broken about 2 inches away from the connector that plugs into the throttle body you can pull on the wires and if one starts stretching its broke inside of the sheathing

Posted on Nov 12, 2010

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Reduce power light on has no throttle and keeps giving throttle accuator cdes


2003 Silverado 2500HD REDUCED ENGINE POWER - Discussion on Topix

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Reduced Engine Power Message Displayed on GM Vehicles

www.underhoodservice.com/tech-tip-reduced-engine-power-message-dis...
Dec 10, 2012 - Tech Tip: Reduced Engine Power Message Displayed on GM Vehicles ... Model year 2008-'10 vehicles must have the engine control module (ECM) reprogrammed ... Do not drop the electronic throttle control components.

Oct 28, 2015 | Cars & Trucks

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I have a 2003 Cadillac CTS. It continues to go into reduced power mode. How do I correct that.


Are you getting a ENGINE POWER REDUCED message ? Is the check engine light on ?
Reduced Engine Power Mode
Throttle Actuator Control (TAC) System
electronic throttle control .
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:
?€¢
Limited torque


?€¢
Limited range of throttle movement


?€¢
Engine OFF


Your going to need to take this to a ASE certified repair shop or the dealer , you probably don't have the diagnostic tools to trouble shoot this problem.
https://youtu.be/oPPLAHSSluw

Aug 16, 2015 | Cadillac Cars & Trucks

2 Answers

On my 2010 Silverado the message center says engine power reduced, service stabilitrack and service traction control system. What would cause these messages. It started after sitting for a few days


The fault codes have nothing to do with it sitting for a few days. There are sensors that work with your ABS brakes and TCS to help your car maintain control when corning briskly under load. You probably have a bad sensor on one of the wheels. Recommend you get the Haynes manual to see exactly how to test and replace them. A multimeter will help too.

Apr 04, 2015 | 2010 Chevrolet Silverado

2 Answers

2004 trailblazer reduced engine power light on and no power,had diagnosed couldn't find any problem, what to do ?


You didnt have it diagnosed very well. When REDUCED POWER message comes on, a fault code is stored. Take it to someone with more equipment and training who actually knows your vehicle. The specific reason behind reduced power can be caused by MANY MANY components or conditions. It needs to be checked by someone with a good quality GM scantool and knowledge of fault diagnostics. If this is a NO CODES STORED issue, then its possibly a memory or live faulting issue. Again, needs to be checked professionally with the proper equipment.

As to people suggesting CHANGE THE O2 SENSOR or CHANGE THE MAF, dont listen. Only change what is tested and bad. Otherwise you are wasting time and money.

Mar 27, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Reduced engine power


LIMP IN MODE re-set your pcm if it re-occurs you may have a transmission slippage issue or a faulty shift selonoid in transmission. with stabilty control feature on some models a bad wheel speed sensor or hub bearing can cause the same but usually accompanied with ABS light

Dec 10, 2013 | Chevrolet Avalanche Cars & Trucks

1 Answer

Engine power reduced, service traction


when you have the fault codes read to find the exact sensor failure or cause , have it fixed then reset the ecm as the ecm will reduce the performance(limp mode) for safety reasons

Jul 20, 2012 | 2008 Pontiac G6 Sedan

1 Answer

The check engine light keeps coming on in my 2004 Chevy Tahoe. At first when it came on, it would show a warning message that states Reduced Engine Speed and the Tahoe wouldn't have any power. Now, it's...


Most auto parts stores have Scanners that can read the actual Codes causing the check engine light- usually for FREE. Google the Codes to determine what needs fixed.

Do not continue to drive it, as it may cause permanent damage!

GL,
Td

Jul 23, 2010 | 2004 Chevrolet Tahoe

1 Answer

Check engine lite is on, power lost lite is on. code p1276comes up. replaced throttle body, but no change. volts at vac fuse 14 both sides. will not accelerate over 1800 rpm's. 2004 trailblazer with 6cyl.


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.

Condition/Concern:
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

Recommendation/Instructions:
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.

Condition/Concern:
MIL light on. Reduced Power message on DIC. Possibles DTCs P2120 and/or P2122, P2123, P2127, and P2128.

Recommendation/Instructions:
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.

Hope helpes.

Feb 09, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

What does Failsafe Engine Mode mean? my manual was stolen


Hello! Fail safe mode is when the vehicle's computer detects a serious problem an allows you to "limp" off the road or highway safely.

Fail safe mode on a Jaguar is mainly caused by a dirty and gummed up throttle body. The throttle body on your auto has a protective coating, so you can not use just any cleaner. It requires a throttle body cleaner that states "safe to use with a protective coating". The butterfly valve in the throttle body will actually "stick out". This causes fail safe mode to kick in reducing the amount of power your engine can produce.

Also check the plugs on your ECM (computer) and make sure they are all seated properly.


Guru...............saailer

Dec 13, 2009 | 1998 Jaguar XJ8L

2 Answers

Check engine light "reduced enging power" message?


hook it up to OBD 2 scan retrieve fault code and go from that point!

Dec 24, 2008 | 2003 Chevrolet Tahoe

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