October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Diagnostic Aids

Verify circuit No. 413 has a clean and tight ground connection. If circuits No. 412 or 413 is open, Code 13 will set. An intermittent may be caused by rubbed through insulation or a wire broken inside the wire insulation. Check ECM harness connectors for backed out or damaged terminals. If code is intermittent, see TESTS W/O CODES article.

Fig 1: Code 13, Circuit Wiring Diagram & Flow Chart

Courtesy of GENERAL MOTORS CORP.