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International Automotive Technicians Network

U0121 Diagnostic Trouble Code Discussion for August 2015

Lost Communication With EBCM


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Trouble Ticket Help Requests for DTC U0121
Help Request Posted
2006 Dodge Charger SXT 3.5L MIL Lamp on VIN: 2B3KA43G56
U0121: Lost Communication With Antilock Brake System Module. vehicle battery went completely dead, auxillary equipment left on, boost car then charged battery on test drive would not go above about 35 miles per hour transmission not shifting speedometer not working
August 03, 2015
2006 Dodge Charger SXT 3.5L MIL Lamp on VIN: 2B3KA43G56
U0121: Lost Communication With Antilock Brake System Module. vehicle battery went completely dead, auxillary equipment left on, boost car then charged battery on test drive would not go above about 35 miles per hour transmission not shifting speedometer not working
August 08, 2015
2005 Mazda 3 S 2.3L MIL Lamp on VIN: JM1BK12315
U0121: Communication Error To ABS-HU/CM. Hi just wanted to know if I can change the vin number doing a reflash first time using passthru any help will be app . Or any otherway with the mazda supcrition .They gave me this vehicle data number EEBE-FFFF-FFA9 .How do I use it. THANK YOU.
August 11, 2015
2009 GMC Savana 3500 6.0L No Start, Cuts out, Stall VIN: 1GJHG39K89
U0121: Lost communication with Antilock Brake System control module. Hello everyone, I am hoping someone has seen this before. I have this van that stalled while driving. The customer noticed the traction control light was intermittently coming on prior to the stall. Vehicle was towed in and it started up for me fine and I drov...
August 25, 2015