Hoping someone can help with this. I have been getting the esc,abs,service 4 wheel drive lights lately. The brake pedal pulses as well. Had the codes pulled this morning. The front left abs sensor has gone bad-got that one. But some of the codes have me stumped. U0100,U0101 lost ECM and Tcm communication, any ideas on this? Also U140E, and B2202 these I can't find and have no idea what they are. The person at Advance Auto that pulled the codes also said the battery showed low-B2100. Could anyone offer some guidance on the U140E and B2202? Also the P0700 code popped up. Thanks for any help with these.