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Thread: P0690 Code help
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04-27-2020 #24
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- Join Date
- Apr 2018
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- 36
Checked on a vehicle in shop today, had LS7. Removed Powertrain relay, cycled ignition, left off, probed terminals.
Term 30 12.7V, Term 87 0V, Term 86 12.6v, Term 85 0V. Cleared P1682 code afterwards.
This vehicle has the GM trans computer that plugs in to the bulkhead connector.
I feel something is suspect with your harness. Is there anything connected to your bulkhead connector?
According to GM instruction sheets, the LS engine control kits all use the same engine harness.
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