Originally Posted By: Hib_Halverson
Admittedly, we're getting off-topic here a bit and I apoligize to others here.
C0561 is not a fault in the EBTCM but is a code which sets when other modules (ECM, BCM, IPC or TCM) have a problem communicating with the EBTCM. Diagnosing this may be difficult if there are no codes set in other modules relating to serial data. That said, this code needs to be solved because when it's set, traction control and stability enhancement are disabled.
P0171 and 0174 are, of course, the two codes for lean exhaust. Considering the supercharger installation, assuming there are no problems with vacuum leaks and without any other information, I'd say this is a part throttle tuning issue.
I didn't realize Edelbrock was not selling pistons with the LS7 blower kit. I had heard, back before the E-Force for LS7 was released that Edelbrock was going to do that for reliability/durability reasons.
My understanding is that the Service Traction Control, which sets a C0561 code is set when the fuel trims exceed the value. It indicates that the BCM, ECM, IPC and the TCM should be checked for a possible fault. And it always sets before and with the lean code CEL's. However the P0171/P0174 CEL's are not set unless the ECM reports a failure on the second ignition cycle the control module records the operating conditions at the time of the failure. Which is why they always set immediately upon restarting or during the second driving cycle at idle.
Below is a copy of the text from GM's SI database.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second ignition cycle the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. The control module illuminates the malfunction indicator lamp (MIL) when one of the following occur:
•The control module detects the same fuel trim failure during 2 consecutive trips.
•The control module detects any fuel trim failure during any subsequent trip if the conditions at the time of failure meet the following criteria.
•The engine load is within 20 percent of the previous test that failed.
•The engine speed is within 375 RPM of the previous test that failed.
•The engine coolant temperature is in the same range of the previous test that failed.
