Hi my ecm coused fuel to dump in to cads so along with ecm and completwe module replacment the dealer says i now need to replace cads 3500.00$ chain reaction the day after i had module replaced the cad sensor went on they left the inta boot loose cousing cad melt down well the ecm got recalled the day after i had it replaced the trucks back at dealer ... what do i do

The fuel pump control module is controlled by the ECM - engine control module , Possibility of DTC'S stored ! You need to take to Chevy Dealer !
The engine control module (ECM) supplies voltage to the fuel pump control module (FPCM) when the ECM detects that the ignition is ON. The voltage from the ECM to the FPCM remains active for 2 seconds, unless the engine is in Crank or Run. While this voltage is being received, the FPCM closes the ground switch of the fuel pump and also supplies a varying voltage to the fuel tank pump module in order to maintain the desired fuel rail pressure.

- Engine mechanical problems
- Incorrect timing chain
- Stretched timing chain
- Failed camshaft actuator or actuator solenoid

Hi.
If your fuel pressure is good, timing is good, and compression is good, it is very possible that your ECM, (Engine Control Module) is bad. The computer is not properly modulating the pulse width on the injectors. The pulse width is too wide/long causing the injectors to dump too much fuel. In short, the injectors are staying open too long. Check your connections on your ECM to make sure there are snug. Try removing your battery terminals, unplug the ECM connectors for a few minutes and then plug the ECM back in, reconnect the battery terminals and try it again and see if this helps. If this does not work the ECM is more than likely bad. Hope this helps.

I would check for a short somewhere in the wire harness or check the bell for true on crank balancer make sure its not rubbing pickup

If it is indeed a spark issue. You might have to replace the Ignition Module. On the other hand... check the throttle body to make sure that it is getting fuel... if it's not, you might just need to replace the fuel pump.

Hello: Have you had the replacement PCM (scm) programmed, if not you will have to take it to a GM dealer along with your vin number. The dealer will have to have an off board programming equipment. Also is the knock sensor module installed on the PCM?

have you checked to see if you have a bad came or lifter. that would make it backfire. if it kind of spits fuel it maybe cam. if it throws fire than it could be timing like a bad chain.

ECM Trouble Codes
12-Distributor signal fault
19-Fuel pump circuit fault (short)
30-Idle speed control (isc) motor rpm out of range
41-Camshaft position sensor (CMP) or circuit fault
52-Electric control module (ECM) reset
91-Park neutral position switch or coicuit fault

BCM Trouble Codes
10-Outside temperature sensor or circuit fault
32-Electronic control module (ECM) to Body control module (BCM) fault loss of communcation

Source: Haynes repair manual

your best bet is to get a used ecm form a salvage yard it should cost you about 200 dollars that is far cheaper than going to a dealership or a parts store. generally that is what i do when i replace ecms. there are plenty of wrecked vehicles and the ecm is good in them so why pass it up to get a part that cost brand new about 1500 dollars.. goodl luck. please rate this

Well i searched this link all got was this information hope it helps you :

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800bfd7d

Good luck..