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P0700 — Transmission Control System Malfunction

P0700 is an "informational" code set by the engine control module when the transmission control module (TCM) reports any fault. P0700 itself does not identify a specific transmission problem — it is a flag that tells you to scan the TCM for the underlying code or codes. The actual fault could be anything from a shift solenoid failure to a slipping clutch pack to a low-fluid condition.

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