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How to fix idle speed 2007 trailblazer - Chevrolet Cars & Trucks

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The idle speed is computer controlled and not adjustable as there is no linkage or throttle cable, it is a drive-by-wire motor controlled by a potentiometer at the pedal assembly. If there is an idle problem, I would first start by looking for vacuum leaks as this is usually the root cause of an unstable or high idle. You may also want to check to make sure the vehicle is getting up to operating temp. as this can fool the computer into raising the idle to get the engine warmed up faster.

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

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Abslight stays on. How to fix? This is a2007trailblazer?


First you need to have EBCM - electronic brake control module check for DTC'S - diagnostic trouble code's . If the light is on there is a code stored . I think most part stores can do this and for free . After you find out what code is stored , looking up that code in service repair information for diagnostic trouble shooting chart would be next step . There are a few codes too.
DTC C0035 or C0040
DTC C0045 or C0050
DTC C0110
DTC C0131
DTC C0161
DTC C0186
DTC C0196
DTC C0201
DTC C0240
DTC C0241 or P0856
DTC C0244 or P1689
DTC C0245
DTC C0283
DTC C0287
DTC C0290 or C0292
DTC C0455
DTC C0550
DTC C0558

Find the code do the diagnostic's , fix the problem , wiring issue's , a sensor , bad module ,what ever it is . The light will go out then . Here is a sample of code discription .
• DTC C0035 Left Front Wheel Speed Sensor Circuit
• DTC C0040 Right Front Wheel Speed Sensor Circuit

Dec 30, 2016 | 2007 Chevrolet Trailblazer

1 Answer

2002 trailblazer oil pressure drops when stopped returns accelerating


Usually means the engine bearings are worn out, or the oil pump is weak.
As the oil gets hot, it gets thinner, which reduces pressure. When the engine is at idle speed the pump is not pumping as fast as it is at highway speed.

Aug 26, 2015 | 2002 Chevrolet TrailBlazer

1 Answer

Where is the transmission speed sensor located on a 2007 4x4 trailblazer, will it cause the transmission not to shift into 3rd gear?


No it would not ! you probably have a 2-3 Shift Solenoid (SS) problem !
You trailblazer has Vehicle Speed Sensor (VSS) located on the tail shaft of the trans . this sensor supply's info to the PCM for vehicle speed . Your trailblazer also has a Input Speed Sensor (ISS) if this were bad it would cause erratic shifts all gears ! Does your vehicle have a check engine light lit or any other type light like a yellow wrench or service vehicle soon ? Your best bet is to take it to AAMCO or some other ASE certified repair facility !

Aug 01, 2015 | 2007 Chevrolet Trailblazer 4.2

1 Answer

Idle problems trailblazer


Check or replace Fuel Filter... have somebody check your idle speed....

Aug 27, 2014 | 2003 Chevrolet TrailBlazer

1 Answer

How do I clear computer error codes in a trailblazer?


With a scanner, or disconnect the battery for 20 minutes , in which case you may have idle speed problems and need to have an idle relearn done (via scanner)

Nov 26, 2013 | 2002 Chevrolet TrailBlazer

1 Answer

On 2004 Trailblazer, when air conditioning is turned on car does not idle right almost cuts off. no problem at speed, only idle & slowing down.


I would suspect the clutch on the air conditioning unit, also if the unit is overcharged
from a recent charge this would also bog the engine. At speed it would not be as pronounced.
Hope this helps.

Apr 25, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

Idle rpm too low


are you reading your rpms right....5-6000 rpms should equal 70- 85 mph....that is certainly not idle speed....invest 20bucks in a Haynes manual----it is good reading

Mar 01, 2010 | 2007 Chevrolet TrailBlazer SS

2 Answers

Idles up and down when my 2003 trailblazer is in nuetral


Here is the common problem and fix.

Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 21, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

At stop rough idle


idle air speed controller.
dirty throttle body
air cleaner clogged
air flow meter
bad injector
leaking intake manifold
vacuum leak
bad plugs
ignition components

Nov 22, 2008 | 2005 Chevrolet Trailblazer Ext

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