Where is the PCM located on a 1995 Chevrolet Astro RWD van and how hard it for novice to change?

In a 1995 Chevrolet Astro RWD van, the Powertrain Control Module (PCM), often mistakenly called the ECM (Engine Control Module) in older GM vehicles (they're essentially the same thing in this context), is typically located under the dash, on the driver's side. It's often mounted to the firewall or a nearby support bracket. You'll likely need to remove some trim panels to access it.

How hard is it for a novice to change?

Replacing the PCM on a 1995 Astro is not a job for a complete novice. While the physical removal and installation might seem straightforward once you locate it, there are several significant challenges:

* Locating the PCM: Finding it behind the dash can be tricky. You'll need to be comfortable removing interior trim pieces without damaging them.

* Electrical Connections: The PCM has numerous connectors, and it's crucial to disconnect and reconnect them carefully, noting their positions. A misconnection can cause serious damage to the vehicle's electrical system.

* Programming: After installation, the PCM *may* need to be programmed to the vehicle. This often requires specialized tools and software, and it's something a professional mechanic would typically handle. Failure to program it correctly could result in the vehicle not running at all or exhibiting various problems.

* Potential Underlying Issues: A faulty PCM is sometimes a symptom of another problem. Replacing the PCM without addressing the root cause could lead to a premature failure of the replacement unit.

Recommendation:

Unless you have significant experience working on automotive electrical systems, it's strongly recommended that you take your 1995 Chevrolet Astro to a qualified mechanic for PCM replacement. The potential for damage and the cost of professional programming outweigh the potential savings of doing it yourself. The risk of mis-installation is far too great for a novice.