Quote:
Originally Posted by Marc Haibeck
Hi Dominic,
A data scanner can cause the CCM 72 error because the scanner can hog the serial data buss.
The problem can occur if the ECM calibration model year does not the match the CCM MY.
If the fuel use data is displayed on the cluster the serial data line between the ECM and the CCM is working.
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Marc,
As always thanks for taking the time to provide an answer. I have seen the code whenever I connect with my EASE scantool. For some reason this time, the scantool was not connected. I had been driving around when I had to stop at a railroad crossing. It was a slight incline. Shut the motor off since this was a 2 mile freight train. Crossing clears and I start motor to move, engine stumbles, Service ASR and Service Engine light pop on along with high idle. Car runs poorly for a bit but things seem to clear up with car being operable. Both lights stay on. When I get home, I plug in code scanner. No code for the ECM, just 12 Flashing. Ground ALDL pin G,
and I get H72 on Module 9.
FSM suggests wiggling EBCM harness connectors to see if I could recreate. Nothing showing up at this point. Same thing happened on way out of BG last Sunday. Paul and I stopped for gas before hitting 65. I shut motor off. When I turned it back on, I got SES and SASR light. Didn't take the time to read codes, I just drained the batt, and went home. However, motor just didn't feel as crisp but did not encounter any further codes.
