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Where is the transmission control module located on a 1990 Jeep Comanche 2WD with an 4sp auto tranny?

The Transmission Control Module (TCM) on a 1990 Jeep Comanche 2WD with a 4-speed automatic transmission is integrated into the PCM (Powertrain Control Module). There's no separate TCM like in later vehicles. The PCM controls both the engine and the transmission.

Therefore, you'll need to locate the PCM itself. It's usually found under the hood, often near the firewall, but the exact location might vary slightly depending on options and specific build. Consult a repair manual specific to your 1990 Jeep Comanche to pinpoint its precise location.

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