Find a wiring diagram so you know which wires are what etc. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6. This system can set a number of codes! Inventory changes often so if you don't see the transfer case control modules that you need we can help you find it when you complete our. In this module, the resistor is required to operate near it's limits, and I believe that the conformal coating trapped heat and caused the resistor to fail. Being both cheap and inquisitive, I wanted to investigate further, and I will provide a more in-depth answer. If communication is possible, go to step 5.
If the tread on one or more tires is different, you need to change all 4. I changed only 2 at a time, the front tires would rotate faster than the rear, which would case the gears in the transfer case to bind up and not easily release. If there is vacuum then problem in actuatoror cable linkage. A quick test of the system is to ground the F4 pin, recycle the ignition, and try shifting the transfer case into and out of 4 wheel drive. Posted on Apr 29, 2009 www. The condition is typically intermittent and always occurs at key-up. Go into your glove box and at the bottom you will see a white label about the size of a credit card.
About a year after that, the rear end went out, most likely because of pressure and heat. If no holes found in the hose or actuator diaphragm I would use batterycables and hook up the battery and start vehicle then check for vacuum byputting my finger on the end of the actuator hose. Any info or advice will be appreciated. I replaced the switch - no help. You can check other resistors nearby for a relative comparison. Remove the battery and tray; look for a holeburnt in the vacuum line or actuator module rubber diaphragm. Look for the N letter and then see if you have np,np1,np8,or np2.
The transfer case control module is located behind the left side of dash behind the headlight switch, you will need to remove the speedo trim around speedometer, then pull put the headlight switch. Has anyone ever heard or experanced this? There is also tag on the back of the transfer case that will tell you what type it is. Or the transfer case shift control module? Videos on youtube on basic automotive electrical testing , testing inputs an outputs for control modules. It should be removed but left connected. Finding out what if any codes are stored should be your first step. When mine did disengage, I would hear a bang and the whole truck would shake.
Should have had this done before replacing parts. This pin should be high or 12 volts when in 2 wheel drive, and low or ground when in 4 wheel drive. I see a lot of recommendations on this thread to replace control head switches when the light comes on but wonder how many times that one single piece really fails vs. It will have a bunch of numbers and letters. I used a lamp based test light to be safe. Please respond if this procedure helps you. Our large network of salvage yards ensures that you'll be able to find used Chevrolet Silverado 1500 transfer case control modules quickly, all from the comfort and convenience of your home or office.
The Np1 is a selectable. Which 4X4 system does your's have? Verify operation and that no codes are present. Below you can browse the current inventory of used Chevrolet Silverado 1500 transfer case control modules sold by leading salvage yards across the United States. Feb 4, 2012 Sep 25, 2009 Dec 06, 2015 Which of these does your vehicle have? If no codes ,check B+ power and grounds for the control module. Tech diagnosis - bad xfer case control module.
This information refers to the 15748800 module. Because of these features, and because we're pretty successful at finding any type of Chevrolet parts, including transfer case control modules, we're confident that you will use our service again and again. The transfer case shift control module determines whether or not the clutch pack has been applied or released based on a signal from the front axle switch mounted on the front axle housing assembly. Got to love that fancy push autocrap 4wd system…. Np is a 149 1 speed automatic. Makes you wonder why so many people love the push button stuff when the manual transfercases are almost fool proof.
If you need to replace your transfer case control module for your Chevrolet Silverado 1500, then you have come to the right place. If the vehicle is started and driven in 2 hi, the vehicle operates normally. We'll do our best to help you find top-quality transfer case control modules at the best prices possible. Used Transfer Case Control Modules for the Chevrolet Silverado 1500 for Sale Get a great deal! This solenoid opens and closes a vacuum control valve allowing vacuum to apply and release a clutch pack inside the front axle housing. If the battery has ever leaked the acid runsdown onto the actuator causing the problem. When the activator get vacuum it pulls acable that attaches to the front diff engaging it, when engaged the wires onthe front diff send a signal to the 4 X 4 light on the dash telling you it is engaged.
If the driver attempts to switch the transfer case into any other mode, the transfer case makes noise as it shifts, the service 4x4 light comes on and the newly selected mode indicator light starts to flash. . This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Let me know if you need more help. If the mode indicator light remains steady and the Service 4X4 does not light, proceed with this repair procedure. The four button system can set a bunch of them.
The module can then be restored to the vehicle, and your 4X4 should work normally. If no communication, go to step 2. Engineer a system that stinks and will fail then poke you for years of replacement parts. Bend the 8 tabs away from the back cover. That is how they make money in service parts.