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B1021 Diagnostic Trouble Code Discussion for January 2011

Loss of PCM serial data


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Trouble Ticket Help Requests for DTC B1021
Help Request Posted
1998 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1244W
B1021: loss of pcm serial data. This car originally came in for a no start, replaced ignition module and crank sensor and plugs and wires. Came back 2 months later for intermittent no start. If we leave it outside it will sometimes not start then we bring it into the shop and start testing a...
January 27, 2011
1998 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1244W
B1021: loss of pcm serial data. This car originally came in for a no start, replaced ignition module and crank sensor and plugs and wires. Came back 2 months later for intermittent no start. If we leave it outside it will sometimes not start then we bring it into the shop and start testing a...
January 27, 2011