by Mike Lundgren | Aug 8, 2026 | Module Programming
When programming GM 8-speed transmissions after replacement, you must choose between two different identification numbers: the TUN (Transmission Unique Number) or PUN (Part Unique Number). The TUN is found on a white sticker on the passenger side of the transmission...
by Mike Lundgren | Jul 30, 2026 | Diagnostics
When diagnosing a no-start vehicle, one of the most critical early decisions is determining whether the immobilizer system is actually preventing the engine from starting. Many technicians waste valuable time chasing immobilizer issues when the real problem lies...
by Mike Lundgren | Jul 25, 2026 | Module Programming
Understanding MOST Bus Network FailuresWhen an infotainment screen suddenly goes blank, the problem often lies within the MOST (Media Oriented System Transport) network. This fiber optic or copper wire communication system connects all entertainment and information...
by Mike Lundgren | Jul 17, 2026 | Diagnostics
When a 2019 Toyota Corolla’s HVAC system stays powered on after the key is removed, the problem isn’t always a faulty control module. In this case, mouse damage created both an open circuit and a short to power in the same wire, causing the AC amplifier to...
by Mike Lundgren | Jul 9, 2026 | Module Programming
Programming a Jeep or Chrysler 9-speed ZF transmission involves up to five different procedures: VIN write, software programming, valve body learn, proxy alignment, and QuickLearn. The specific steps required depend on whether you’re replacing just the...
