EG9 K20A3 4/9/2012I only stuck with the engine code. It may mean that one or more of the following has happened:
* Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump
* Blown AIR pump fuse due to freezing up
Note: There is a technical service bulletin (TSB) regarding this code for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose. The TSB can be found on this ACDelco site.
Additionally, if you simply replace the AIR pump the problem may return again (and again). If you replace the pump, also clean out the hoses and replace the one-way check valve. If this is on a GM model that the TSB applies to, follow those instructions in the link above. In a few cases, people have put a small hole in the rubber cover on the pump which allows any water to drain out.
Also, please note that this may be covered under the emissions warranty on the vehicle. If your vehicle is out of bumper-to-bumper warranty, check if the emissions warranty is still valid!
* Replace the AIR pump AND one-way check valve
* Test and clean the AIR pump AND test and replace the one-way air check valve
* Replace the AIR pump inlet hose
* Replace the AIR pump fuse (found under the hood)
Has the fuel filter been changed? If not, could have lots of sediment in the filter, that might cause engine to stall, then restart. Does the engine restart right away? Is the engine hot when it happens? Has the fuel pump been replaced yet? Possible cause also, Injectors might be blocked. Possible might be the ign. module on the dist. Gets hot, and then shuts down. M.A.P ( master air pressure ) comes off the EGR with a small hose to a small sensor. Also, M.A.F. ( master air flow ) not working properly. This is in the air intake around the filter. Has the air filter been checked? Does the EGR valve work properly? Might need to be cleaned. So sorry for all the information, but, you have to eliminate all the above one by one. Start with the fuel. Good luck
Larry 5/4/2012I had a simular problem. The car would shut down starting maybe twice a year either while diving or at rest. The car then began to shut down more than twice daily. It turned out to be the crank position sensers. To add to the problem i found the crankshaft harness had been damaged from a prior repair the drive belt was severing the harness located on the passenger side in the engine compartment.