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International Automotive Technicians Network

B1021 Diagnostic Trouble Code Discussion for October 2009

Loss of PCM serial data

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Trouble Ticket Help Requests for DTC B1021
Help Request Posted
2005 Other European fortwo coupe .7L MIL Lamp on VIN: WME4503321
B1021: no CAN from instrument panel. ... with this Smar Car because I simply do not have information on it, no wiring diagrams, code definition or trouble chart, etc. I cannot communicate with the PCM on this vehicle. I tried six different scanners. I was able to pull 13 codes from three other co...
October 28, 2009