4L60E 4L65E Internal Wiring Harness w/ Lock-Up TCC Solenoid Fits GM 2003-2006

4L60E / 4L65E Internal Wire Harness with Lock-Up (TCC) Solenoid — Fits GM 2003 to Early 2006

Direct replacement internal wiring harness with integrated torque converter clutch (lock-up) solenoid for GM 4L60E and 4L65E automatic transmissions. Plug-and-play design — no cutting, splicing, or modification required.

Symptoms This Part Helps Resolve:

• Trouble code P0740 (TCC circuit malfunction)
• Trouble code P1870 (transmission component slipping)
• Trouble codes P0753 / P0758 (shift solenoid electrical faults)
• No torque converter lock-up / poor highway fuel economy
• Harsh, erratic, or inconsistent shifting
• Transmission stuck in limp mode (2nd gear only)
• Intermittent electrical faults from brittle, chafed, or heat-damaged internal wiring

Replaces OEM / Reference Part Numbers: 24234280 | 15320476 | 24222891 | 24229669 | 24298348 | 24229422 | Rostra 350-0061

Fitment — 2003 to Early 2006 4L60E / 4L65E Transmissions:

IMPORTANT — Please Read Before Ordering:

• Does NOT fit 1993–2002 transmissions (different case connector design)
• Does NOT fit mid-2006 and later transmissions built with the input speed sensor (ISS) pump design — verify your pump type before purchase
• 2006 was a split production year; if your unit was built after the ISS changeover, a different harness is required

Installation Notes: Pan removal and filter service required for access. Replacing the transmission filter and gasket at the same time is strongly recommended since the pan will already be down. Always confirm the harness connector matches your transmission case connector before installation.

Pro Tip: Finish the job with Lubegard Platinum Universal ATF Protectant at refill — the red bottle helps protect solenoids and clutch packs from heat-related wear and helps restore smooth shift feel.