Instead of just firing the parts cannon, we monitored the ECM’s power and ground feeds during the no-start events. They were perfect. The issue was internal to the module itself, a classic sign of heat-related failure on these circuit boards.
This E.C.M. fits the following vehicles: 2012-16 6.0L GMC sierra (2500HD, 3500HD). It will also fit the vehicles listed in the compatibility chart. This auction is for one service number 12668866 ECM (Engine control module) that is programmed for your vehicle using the latest software updates using your V.I.N. (Vehicle identification number) to exactly match your vehicle. After you purchase the E.C.M. you will need to provide us with your V.I.N so that we can program the E.C.M. before we ship it to you. This computer is refurbished and tested for functionality. There is no core charge you keep your old E.C.M. There is a one year replacement warranty. A 30 “do it yourself” minute security password relearn procedure may be necessary if the vehicle does not start. Instructions for that will be included. A crankshaft variation relearn will need to be performed once the vehicle is running. This will be evident if the check engine or service engine soon light comes on once the vehicle is running. You will need access to a scan tool capable of doing this procedure to do this and clear any related trouble codes (Code P0315). If this is not available to you a repair shop will have to perform this and clear the related trouble code. The vehicle will run normal but the ”service engine soon” light may come on and a trouble code will be stored until this is resolved. We will ship within one business day of payment. You can pay instantly with PayPal. Same day shipping as long as the order is made by 2:00 P.M. EST (Mon-Fri).
Chevrolet Suburban 3500: 2016. It would be fine for weeks, then leave him stranded. His scanner showed no consistent codes, just a few random communication faults that would disappear. We checked the battery, grounds, and fuel pump—all were perfect.
E78 12643636 Engine Control Module programmed to your VIN with newest updates -IMPORTANT:match your PCM/ECM service number before purchasing.This module needs security key relearn to start the engine, and it may need crankshaft variation relearn (code p0315). You will need a scan tool capable of doing this relearn.send your 17 digit VIN through message to seller at the time of the payment. We offer 1 year warranty on this item. Shipped via USPS Priority Mail.
When it fails, it can create a cascade of problems that are difficult to diagnose. They had already replaced the battery and checked the alternator. While wiring should always be checked, the P0601 code is a strong indicator of an internal ECM processor failure.