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4l60e servo assembly diagram3/1/2024 ![]() ![]() Using harness jumper wire and instruction kit, P/N 12167310, revise the wiring harness at the VCM connector. Upon investigation, the technician may find a DTC P1870 stored in the VCM.Ī poor internal ground between the two circuit boards of the VCM may cause the VCM to command erratic line pressure at the pressure control (PC) solenoid valve. Some owners may comment that the automatic transmission has either a slip or flare on the 1-2 and/or 2-3 upshift, or no 3rd or 4th gear, or launch shudder. Inspect the VCM to verify the latest part number revision (16244210). When performing a transmission replacement labor operation K7000 on these vehicles with a 4L60-E or 4L80-E, you must include front chassis wire repair labor operation N6112. Please discard Corporate Bulletin Number 66-71-03A (Section 7 - Automatic Transmission). This bulletin is being reissued to ensure that correct procedures are followed for this condition. With VCM and 4L60-E (M30) or 4L80-E (MT1) Automatic Transmission ![]() See: No 2-3 Shift or 2-3 Shift Slipping, Rough or HuntingĢ-4 band assembly worn or incorrectly installed.Ī/T - Upshift Flare/No 3rd or 4th/Launch Shudderįile In Section: 07 - Transmission/TransaxleĪutomatic Transmission 1-2 and/or 2-3 Upshift Slip/Flare, No 3rd or 4th gear, Launch Shudder (Revise VCM Wiring)ġ996 Chevrolet and GMC C/K, S/T, M/L, G1, G2, P3 Models Refer to No 2-3 Shift or 2-3 Shift Slipping, Rough or Hunting. Porosity in 3-4 accumulator piston or bore.ģ-4 accumulator piston seal or seal grooves damaged.įaulty input housing assembly. Third accumulator retainer and ball assembly leaking. Plugged or missing orifice cup plug in 2-4 servo assembly. Porosity in 2-4 servo pistons, cover and case. Incorrect 2-4 servo assembly band apply pin. Valve body assembly spacer plates or gaskets incorrect, damaged or incorrectly installed. ![]() Pump cover retainer and ball assembly omitted or damaged.Īccumulator valve, throttle valve, TV limit valve, 3-2 control valve, 1-2 shift valve train or 2-3 shift valve train stuck. Governor support pin in case too long or short. Governor drive gear retaining pin missing or loose. Please register or login to enable Dark Mode.Hot Rod Power Tour/ Pump Gas Drags/ Drag Week.Gen 5 Camaro Tuning, Diagnostics, Dyno results. ![]()
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