Getting the error codes can be a huge help in pinpointing the problem, but they are not perfect.The Body Control Module (BCM) could be considered a central organizational module for your vehicle. How much does an ECM replacement cost Usually, a brand new ECM part will cost you around 400 to 2,200. The engine computer, or PCM/ECM, manages the performance of the engine, the emissions system, and it controls the transmission, among other things. The engine control module is a mini computer that controls many of the vehicle’s functions.Asked by RobertHolland073 at 04:06 AM about the 1994 Chevrolet Suburban K1500 4WD. CarGurus4 wheel drive does not work - When I put the Sub in 4 wheel drive, low of high. > Questions > Chevrolet > Suburban. We use cookies to keep our products working properly, improve user experience, analyze site traffic through our analytics partners, and serve targeted communications.The good news: The Transfer Case Control Module stores codes related to any failure it sees.Chevrolet Suburban Questions - 4 wheel drive does not.Benefit from a quicker and simpler transaction. They are not OBD "Powertrain" codes, but custom GM "Body" or "Chassis" error codes.Ideal for buying, selling, lending, and insuring. The bad news: Most code readers cannot retrieve these codes.
If the "SERVICE 4WD" message is lit as soon as you start the vehicle, that probably indicates a constant wiring or part fault and the Transfer Case Control Module is noticing that fault as soon as it is energized when the truck is turned on. If it fails to move to the new position, it goes back to a solid light on the original position and illuminates the "SERVICE 4WD" light.Does the "SERVICE 4WD" message come up as soon as you start the truck, or does it only activate after you try to select a mode other than 2 Hi? If you got a scan and now have an idea of what to replace, go to the appropriate section.Do you have a yellow status light on the dash switches? Which mode is lit? The solid lights on the 4WD buttons are telling you where the transfer case encoder motor thinks it is, and blinks on the mode that it is trying to go to after you push the button. See here for details from a Chevy Trailblazer owner.BO790-transfer case nuetral indicator circuit malfunctionCO379-front axle control circuit malfunctionCO359-discrete output circuit malfunctionCO300-rear propshaft speed sensor malfunctionU1301-class 2 communication circuit low voltsIf you don't want to spend the money for a scan, read on. ![]() If the readings are wrong, it may be time to replace the buttons. Some people have had success with squeezing the button module. Note that some measurements are in "Ohms" and some are "Kilo-Ohms" (1000 Ohms).If your resistance measurements fall outside these ranges, or jump around a lot, try spraying some contact cleaner or compressed air into the switches to see if it improves the problem. The resistance should be steady (no changes while the button is pressed). Disconnect both connectors.Using the DMM, measure the resistance between the innermost pins on both connectors. If nothing happens when you push a button (no changes to the lights, and no noises from under the truck), the buttons may have failed.Check every function for response: 2HI, Auto4WD, 4HI, 4LO, Neutral.Pull the dashboard apart (it is just held with clips) and pull out the buttons. Azure dreams gbc emulator macIf not, the motor may be bad. Use a DMM or test light to check if the actuator is getting a signal from the TCCM. The actuator has 12V, ground, command signal in, and position signal out at its connector. It is similar to locking the hubs in the old days, but it happens inside the axle housing. ![]()
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