Apr 212016

2000 Chevy SilveradoI changed oil pan, timing cover and water pump gaskets on my 2000 Chevy Silverado 1500 2wd 4.3l v6. Leaked oil. it ran fine before I did this and when I got done it would crank but not start. code p0336 came up, changed the crank sensor still no start, did a battery cable relearn and still no start. I did mess up pulling the balancer and pull the rubber about 1/2 inch off on one side, pressed it back on and it looks fine, but could that cause a no start? so far I’ve changed cap , rotor and wires. tried putting old crank sensor back in and still nothing. keeps giving me a p0336 code. wires and plug on sensor look good. had coil and icm tested, they’re good. don’t know what it could be now other than the balancer. any advice?


I would lean toward the wiring harness, the connection or the signal plate.

Signal Plate

Code P0336

– Crankshaft Position Sensor ‘A’ Circuit Range/Performance

code P0336Possible causes

  • Faulty crankshaft position sensor
  • Crankshaft position sensor wiring harness is open or shorted
  • Crankshaft position sensor circuit poor electrical connection
  • Signal plate may be damaged
  • Starter motor may be faulty
  • Starting system circuit
  • Dead or weak battery

The Crankshaft Position Sensor (CKP) also known as the crank position sensor is an electronic device used in an engine to record the rate at which the crankshaft is spinning. This information is used by the Powertrain Control Module (PCM) to control ignition and fuel injection. The sensor system consists of a rotating part, typically a disc, as well as a static part, the actual sensor.

When the engine is running, the high and low parts of the teeth cause the gap with the sensor to change. The changing gap causes the magnetic field near the sensor to change. The change in the magnetic field cause the voltage from the sensor to change.

Apr 192016

2005 Chevy TrailblazerMy 2005 Chevy Trailblazer 2WD won’t accelerate beyond 25-30 mph, transmission fluid was replaced/flushed. I’m taking it to a shop today, any suggestions? thanks


It can be tough when trying to diagnose your Chevy Trailblazer for lack of acceleration. When it won’t accelerate normally there are a few things that might cause this. If the check engine light is on the first step would be to pull the engine trouble codes. If the engine seems to rev high and your Trailblazer doesn’t want to move at the same time, the most likely reason would be low on transmission fluid. Check the fluid level first. If the level is low, top it off and resume testing. If the transmission fluid level is full, take note to the color. If it is burnt looking or dark, this would indicate burnt internal clutches. Rebuild the transmission to fix it. If the color still looks new, and internal valve body or solenoid issue is most likely the cause.

Apr 182016

2004-chevy-silveradoEvery couple of days if i let my 2004 Chevy Silverado 1500 sit the battery drains. I have to jump it to start it but every time I take it and have it tested they can never find anything wrong. Battery cables are good and tight and have changed the battery and alternator and shut off the interior lights to where they don’t come on is there anything else i should be looking at


Glove box bulb is one place to look. Wait till night time and then look as it will be easier to see a light. Also check for loose change in the cigar lighter and power ports. A dime or gum wrapper is all it takes to get lodged in there and it will drain the battery.

You may disconnect the battery and see if the battery is still dead after it sits. In most cases the battery itself is the problem. It may test OK at the local parts house, but I can assure you the test is not that accurate.

If you still are having issues at this point you may has a parasitic draw.

Wiki has done a great job on explaining how to test for a parasitic battery draw.

Apr 152016

2003 Chevy Malibu
I’m having problems with my power windows. I replaced the power window switch on driver side door, it worked great for about a week, tonight after it got really cold and snowing it decided that when I backed into my driveway the window on driver door started going down on its own. It will go back up when I push button but when I release switch it goes down. Every time the key is turned it goes down. All other windows work fine. Any clue why this started and how to fix it?


Three reasons come to mind right off that would cause the power window to go down on its own. One would be the new part has an internal flaw. I would however exclude that if this is the reason you replaced the power window switch in the first place. The second reason would also be the most common. The act of opening and closing the door over a period of time takes a toll on the wiring harness that runs through the door jam. These wires become brittle and crack and break. When this happens, the wires can sometimes touch one another causing some weird things to happen. If you have the old switch, swap it out and see what happens. Then perform the “wiggle test” on the wiring if there was no change after swapping out the power window switch assembly.

Power WindowsThe third reason may have to do with the “AUTO” feature for the drivers side power window. This too is built into the drivers side power windows switch assembly.

Auto Power Windows

 The driver’s window also has an express-down feature. This switch is labeled AUTO. Press the rear of the switch partway, and the driver’s window will open a small amount. If the rear of the switch is pressed all the way down, the window will go all the way down.

To stop the window while it is lowering, press the front of the switch. To raise the window, press and hold the front of the switch.

2003 Chevy Malibu Power Windows Wiring Diagram

Use this diagram to trace any wiring issues you may have involving the power windows circuit.

Mar 312016

2006 Chevy Silverado

I recently cut my tail/ turn signal light lines and fixed some wiring issues. Got them working properly. Now speedometer wont work abs & brake light on will not shift out of 1st gear in drive. I can only get 2nd if I change it manually. Already changed VSS at transfer case. HELP!!!


If the problem wasn’t there before you went to fixing on the wiring, that would be the first place to start. Undo everything you just did to see if it all starts working again like it did before you messed with it. Looking over the wiring diagrams I do not see any connection between the turn signal lights and the transmission.

The brake and ABS light on being on as a separate issue generally come on together for the same reason.

  1. Low on Brake fluid – How to check fluid levels
  2. Failed wheel speed sensor
  3. Failed Hub Bearing – this takes out the internal speed sensor

I currently own a 2006 Chevy 1500 Z71 and have had to replace both front hub bearing assemblies prior to 60,000 miles. This is a common failure part. Here is the correct part to fit your vehicle, I have double checked for 4WD application. This is the New Style Series by Timken(top of the line) and should last longer. For less than $120.00 with free shipping. And yes the failed speed sensors or faulty signal from one of them will cause the transmission to shift erratically.
Follow image for more Details…

Mar 282016

Chevy Aveo
My Chevy Aveo is having a random cylinder misfire and wanted to know what the fuel rail pressure should be at idle.


With the ignition key in the “ON” position and the fuel pump relay jumped or activated with a scantool, the fuel pressure should read between 55 – 62 psi.

Chevy Aveo Fuel System Description

When the ignition is turned ON, the Engine Control Module (ECM) supplies power to the in-tank fuel pump, by energizing the fuel pump relay. The in-tank fuel pump remains ON as long as the engine is cranking or running and the ECM receives crankshaft reference pulses. If there are no reference pulses, the ECM turns the in-tank fuel pump OFF, 2 seconds after the ignition switch is turned ON or 2 seconds after the engine stops running.

Mar 242016

4 wheel drive actuator chevy colorado 2004
was changing out my 4 wheel drive actuator Chevy Colorado when it cracked and left half of it in, how can I get the rest of it out so I can put the new one in


The Chevy Colorado 4 Wheel Drive actuator sticks in quite a ways. Having it break off is not normal and will require special care. First try to use channel locks to loosen any part that may still be sticking out. If nothing is left sticking out, then use a chisel and hammer it around. You may need to apply some heat to the area. Worse case you will need to replace the housing.

Mar 232016

blower motor resistor

Blower Motor Resistor

My 2001 Chevrolet Silverado 1500 has no power to the blower motor resistor. I have changed all the fuses under-hood and inside fuse panel still no power to my resistor..too the resistor harness off and found it is not connected to any wires at all. It just has one end for the blower motor resistor and the other end goes to the rear air that my truck is not equipped with there for no constant hot wire..I need help I can provide a pic if needed

Not sure exactly what wires you are looking at under the dash. The wiring colors should help to determine which one needs to go where. I have added the blower motor wiring diagram below. Make sure your battery is in good working order and the ignition key is in the “ON” position. You should see Battery positive at all times on the Orange wire going to Pin G on the resistor assembly. Then when the key is on and the blower motor is turned on to High you should see battery voltage on the other Orange wire at Pin F.

Blower Motor Resistor Symptoms

  • Fan only blows on low speed
  • Fan only blows on medium speed
  • Fan only blows on high speed
  • Fan does not blow air out the dash

Blower Motor Resistor Location

Looking at the image above you can see the resistor is located next to the motor. The entire assembly is accessible from under the dash below the glove box area. Removal of the sound deadening material may be necessary.
Quick test for a resistor going out. If the blower motor blows air on high but not on other speeds, replace the blower motor resistor. If it does not blow on any speeds, Check and confirm voltage to the fuses. Apply power direct to the blower motor for testing. If the blower motor works, and fuses are good, replace the resistor.

Mar 062016

2003 Chevy SilveradoI have a 2003 Chevy Silverado  with dual manual temperature controls issues. Drivers side temp control stays on blowing hot air. Passenger side controller works fine. Checked the actuator on the right side above the hump on the floor works fine. which one is it. Even switching to A/C it blows hot air while passenger blows cold.


The drivers side air temperature actuator which is considered the left side.

Air Temperature Actuator Replacement – Left Side

  1. Remove the center console, if equipped
  2. Remove the Instrument Panel
  3. Disconnect the electrical connector from the left air temperature actuator
  4. Remove the screws from the left air temperature actuator
  5. Remove the left air temperature actuator from the HVAC Module assembly

Installation – Install in reverse order

Air Temperature Controls Diagram 2003 Chevy Silverado

temperature controls 2003 Chevy Silverado


Mar 012016

Chevy Colorado

Keyless Entry

Do all 2011 Colorado crew cabs come with the remote keyless entry wiring or only the ones with the remotes. I just bought this Colorado and it does not have keyless fobs and I would like to have remote do0r lock function to work but am not sure if wiring is installed.

The keyless entry system

The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the door locks to unlock the vehicle. Keyless entry will lock/unlock the doors when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the body control module (BCM). The BCM interprets the signal and activates the requested function. A low transmitter or vehicle battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components:

  • Door locks
  • Vehicle locator/panic alarm
  • Illuminated entry lamps

The keyless entry system has the following components:

  • Keyless entry transmitters
  • BCM
  • RF antenna
Keyless Entry Transmitters

The keyless entry transmitters are used to lock and unlock the vehicle door while away from the immediate are of the vehicle. Transmitters will operate at a distance of up to 20 m (65 feet), except Japanese and South Korean vehicles, which are limited to 4 m (13 feet). Up to 4 transmitters may be programmed to a single vehicle.

Body Control Module (BCM)

The BCM is a multifunction module that operates both the keyless entry system. When an RF message is received from a keyless entry transmitter, the BCM interprets this signal performs the specific function, i.e. door lock, door unlock, or vehicle locate.

RF Antenna

The RF antenna receives RF signals from the keyless entry transmitters and tire pressure monitor sensors. The antenna is basically a length of coax wire with the outer shield casing partially removed that is connected directly to the BCM.

Unlock Driver Door Only

Momentarily press the transmitter UNLOCK button in order to perform the following functions:

  • Unlock only the driver door
  • Illuminate the interior lamps for a determined length of time, or until the ignition is turned ON
  • Flash the exterior lights, if enabled through personalization
  • Disarm the content theft deterrent (CTD) system, if equipped
  • Deactivate the CTD system when in the alarm mode
Unlock All Doors – Second Operation

Momentarily press the transmitter UNLOCK button a second time, within 5 seconds of the first press, to perform the following function:

Unlock the remaining doors.
Lock All Doors
Press the transmitter LOCK button to perform the following functions:
•Lock all vehicle doors
•Immediately turn OFF the interior lamps
•Flash the exterior lights, if enabled through personalization
•Chirp the horn, if enabled through personalization
•Arm the content theft deterrent (CTD) system, if equipped
Vehicle Locator/Panic Alarm
A single press of the panic button performs the following functions:
•Pulses the horn three times
•Flashes the parking lamps three times

A press and hold of the panic button performs the following functions:
•Illuminates the interior lamps
•Pulses the horn and flashes the parking lamps for 30 second or until the following conditions occur:
◦The panic button is pressed
◦The ignition switch is turned to the RUN position with a valid key
Rolling Code
The keyless entry system uses rolling code technology. Rolling code technology prevents anyone from recording the message sent from the transmitter and using the message in order to gain entry to the vehicle. The term “rolling code” refers to the way that the keyless entry system sends and receives the signals. The transmitter sends the signal in a different order each time. The transmitter and the BCM are synchronized to the appropriate order. If a programmed transmitter sends a signal that is not in the order that the BCM expects, then the transmitter is out of synchronization. This occurs after 256 presses of any transmitter button when it is out of range of the vehicle.
Automatic Synchronization
The keyless entry transmitters do not require a manual synchronization procedure. If needed, the transmitters automatically re-synchronize when any button on the transmitter is pressed within range of the vehicle. The transmitter will operate normally after the automatic synchronization.