Where is the transmission ECU or ECM located on 2005 Pontiac vibe?

The 2005 Pontiac Vibe doesn't have a separate transmission ECU (Transmission Control Module). Instead, the transmission control is integrated into the Powertrain Control Module (PCM), which is often mistakenly referred to as the Engine Control Module (ECM). They're functionally the same in this case.

The PCM's location on a 2005 Pontiac Vibe is typically under the hood, usually near the firewall, often attached to or near the passenger side (right side) of the engine. However, the exact location might vary slightly depending on the engine option (1.8L or 2.4L).

To locate it precisely, you should:

1. Consult your owner's manual: It will have diagrams showing the location of major components under the hood.

2. Look for a large, rectangular black box with numerous connectors: The PCM is usually a fairly large unit with many wires plugged into it.

3. Search online: A quick search for "2005 Pontiac Vibe PCM location" with images will likely reveal pictures showing its placement.

Keep in mind that working on the PCM requires some mechanical knowledge and caution. If you're unsure, it's best to have a qualified mechanic handle it.