Question about 2005 Chevrolet TrailBlazer

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2005 trailblazer stalling no codes, cleaned throttle body, rpms fine, just sudden loss of power. checked all fuses and relays. will restart within 2 min.

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  • Chevrolet Master
  • 880 Answers

Fuel pump or relay perhaps

Posted on Nov 03, 2013

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Posted on Jan 02, 2017

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SOURCE: 2006 trailblazer 4x4 4.2, stalls while driving.

ok well try this when it stalls see if spark is present and if it is not and it cools down and starts then you might need to replace ignition control module good luck

Posted on Aug 15, 2009

Fireball-Z
  • 18 Answers

SOURCE: van stalls,loss of power

possibly replacing the MAP sensor

Posted on Feb 09, 2009

ZJLimited
  • 17970 Answers

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.

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.

Posted on Feb 09, 2010

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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.

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1 Answer

I have a 2002 trailblazer. The car stalls now for whatever reason.


The throttle body needs to be cleaned, grime in this area prevents the throttle plate from closing completely and allowing air to enter, making the air/fuel mixture lean. Make sure to clean the front and back sides of the throttle body. Also, disconnect the battery during the cleaning process to allow the computer to reset and relearn to the cleaned throttle body.

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ONe of the "easy" fixes is buy a can of throttle body cleaner. Remove the air intake near throttle boddy and clean the inside of throttle body as best you can this should help it. If it doesnt have it checked out it could be more advanced problem. Good Luck.

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1 Answer

I have a 2004 Trailblazer, just changed the battery. When i crank the car it idles up then drops real low in RPMs. will do this a couple of times, sometimes it will stall. If I turn the A/C on the...


Clean the throttle body, it is gummed up. When you changed the battery, you reset the computer and it is running with the factory default settings. Make sure to clean the front and rear sides of the throttle body thoroughly.

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1 Answer

Has low idle and wants to die when a/c is on when idling. Then when i accelerate, it sounds like it is shifting at high RPMs.


The low idle and wanting to stall is caused by a dirty throttle body, it needs to be cleaned thoroughly front and back sides using throttle body cleaning spray. Also while doing the cleaning, disconnect the battery to reset the computer so it will relearn to the newly cleaned throttle body.

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1 Answer

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1 Answer

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Check all ground connections, body to motor ground strap, battery to motor and body ground. Also change fuel filter if it has not been changed within 50,000 miles.

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2006 trailblazer 4x4 4.2, stalls while driving. Engine shuts down, whenever and wherever it feels like it. No pattern other than about every 2-5 miles, has worsened to this point over last 10 days....


ok well try this when it stalls see if spark is present and if it is not and it cools down and starts then you might need to replace ignition control module good luck

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