• DTC U2105 Lost Communications With Engine Control System
Modules connected to the GMLAN serial data circuits monitor for serial data communications, during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have programmed information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are also supervised and some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. When a message that indicates the availability of the transmitter module is not received, the receiver module sets a DTC 21xx where xx is equal to the 2-digit identification number of the transmitter module.
The DTC descriptors listed below provide a method for determining which module is not communicating. A module with a GMLAN serial data circuit malfunction or which loses power during the current ignition cycle will have a Loss of Communication DTC set by other modules that depend on information from that failed module. The modules that can communicate will set a DTC indicating the module that cannot communicate.
Your best bet , take it to a qualified repair shop .
SOURCE: 2005 Chevy Cobalt, how do you reset a fault code?
Your car has a OBD2 hook up under the dash somewhere on the drivers side, You have to have a computer to hook up to that ODB plug and reset it, If you live near a Autozone they will clear the code for you for free, One other thing you try is disconnecting your battery for about 30 mins, that works on alot cars to reset the check light.
SOURCE: my 2005 chevy cobalt factory radio is locked
There are only 2 things you can try to fix this yourself: turn off the engine and open the driver side door (to turn the radio off). Wait 5 minutes, start your car.
If that does not solve it, turn off your engine, disconnect the car battery, wait about 5 minutes. Reconnect the battery (negative pole first - black connector) and try your radio again.
If neither one of these two fix your problem, I am afraid only a GM service center or dealership can fix the problem. The Cobalt is notorious for all kinds of electrical issues.
Thanks for using the fixya forums!
SOURCE: 2005 chevy cobalt 37.000 miles engine light on.
CODE PO449 - EVAP VENT SOLENOID CONTROL CIRCUIT MALFUNCTION.SOUND LIKE EVAP VENT SOLENOID HAS FAILED OR A BLOWN EVAP VENT SOLENOID FUSE.
Testimonial: "Thank you for the help will check it out"
SOURCE: power steering on chevy cobalt
i dont think you can just get the chip,its the complete power steering control module (
computer) typical problem withall ions and cobalts
SOURCE: 2005 chevy cobalt, car wont start ... check
disconecting the battery should reset the pcm. but you will need to find out what caused the problems.
2,163 views
Usually answered in minutes!
×