Why 2005–2006 Jeep Wrangler PCMs Fail – And How We Fix It

If you own a 2005 or 2006 Jeep Wrangler, you may have experienced frustrating electrical or transmission issues that seem to come from nowhere — stuck in gear, check engine light, communication errors, or even a no-start condition. In many cases, the root cause is a faulty PCM (Powertrain Control Module) — specifically the NGC3 PCM used in these models.

Common Signs of a Failing NGC3 PCM

These PCMs are notorious for internal failures, and the symptoms can vary depending on whether your Jeep is automatic or manual. Here's what we've seen most frequently:

• Stuck in second gear (limp mode)
• Harsh or erratic shifting
• No communication with the TCM
• Engine won’t crank or start
• Check engine light stays on
• Random misfire or stalling
• Unexplained battery drain
• Key light or SKIM issues

Common Diagnostic Trouble Codes (DTCs) Reported

Some of the most frequent trouble codes tied to a failing NGC3 PCM include:

• P0700 – Transmission Control System Malfunction
• P0888 – TCM Power Relay Output Stuck Off
• P0601 / P0602 / P0605 – Internal Control Module Memory Checksum Error
• U0101 – Lost Communication with TCM
• P2106 – Throttle Actuator Control System - Forced Limited Power

These errors often persist even after replacing sensors, relays, or solenoids, because the fault lies within the PCM itself — specifically the TCM logic that’s embedded inside the same module.

Why Do These PCMs Fail?

The 2005–2006 NGC3 PCMs are known for:

• Poor internal soldering
• Heat-related component failures
• Power and communication circuit degradation

Over time, these issues cause intermittent or permanent faults that affect both the engine and transmission systems.

Our Solution: A Reliable OEM Alternative

At ECUHack, we’ve spent a lot of time and effort reverse-engineering these units to identify a more reliable OEM replacement — one that avoids the chronic failures seen in the original PCMs.

✔️ Fully programmed to your VIN
✔️ SKIM disabled by default (or enabled upon request)
✔️ Plug-and-play – just install and go
✔️ Bench-tested and vehicle-tested before shipping
✔️ Backed by real technical support

We supply a dependable, tested replacement unit designed to last — not just get you by temporarily.

Having PCM Troubles?

Whether your Jeep won’t start, throws codes, or won’t shift properly, we can help. Reach out to us at ecuhack.com.au or email us at contactecuhack@gmail.com.

We're based on the Gold Coast and ship Australia-wide. Get your Jeep back on the road — without the dealership price tag.