4L70E Tcc Solenoid 2009, new and ready to install. Fits the 4L70E. Ships fast from the USA.
This is the OEM TCC solenoid and internal wiring harness for a 2009 4L70E, listed under reference 24237980. It is the piece to look at when a 2009 Silverado, Sierra, Tahoe or Yukon with this transmission has quit locking the converter, has a shudder that shows up around 45 mph on a gentle throttle, or keeps coming back with converter and sensor codes after the fluid has already been changed. The photo shows the complete assembly: the case pass-through connector, the black on/off TCC solenoid on its branch, and the color-coded plugs for the other solenoids and switches that share the harness.
The computer controls converter lockup with two parts. The on/off TCC solenoid on this harness switches the converter clutch circuit on; a separate PWM solenoid ramps apply pressure so engagement is smooth. Since 1998 this family has used what Sonnax calls EC3 control, where the clutch is often held at a deliberate 20 to 40 RPM of slip instead of locking solid. That matters for diagnosis: a small amount of slip on the scan tool at cruise is normal, but slip that never drops, or lockup that never gets enabled, is not.
Late 4L70E units have a harness-related failure worth knowing about. Transmission Digest documents input speed sensor wiring chafing against the reverse input drum, which produces P0716 or P0717 and erratic operation. Sonnax lists broken retention tabs on harness connectors among the unit's known complaints, and a connector that backs off a solenoid gives exactly the intermittent lockup many owners describe. So with the pan down, inspect the old harness carefully: rubbed-through insulation, a cracked connector lock, or a burned pin all mean the harness, not the converter, is the root cause.
If the wiring is sound, test the TCC solenoid resistance through the case connector and compare commanded lockup against actual slip at a steady speed. Good electrical readings with high slip send you toward the valve body or the converter itself; the valve body testing guide covers the bore checks. Long-term converter slip also tends to travel with burned 3-4 clutches, which our 4L70E 3-4 clutch failure guide explains.
This listing covers 2009 4L70E transmissions. The reference number 24237980 is printed on the listing so you can match it to the number on your old harness or to your parts catalog lookup. Same-year trucks may carry a 4L60E or 4L65E tag, and those versions do not all use an identical harness, so confirm the tag, then compare connector count and colors with the photo. For a 2006 unit, see the 2006 4L70E TCC solenoid and harness. Not sure? Send us your year and VIN and we will check before it ships. Everything we stock for the unit is on the 4L70E collection page.
If inspection turns up burned clutch material, the job is bigger than a harness. The 4L70E master rebuild kit for 2004-2013 covers a full overhaul, and the 4L70E clutch module replaces the 3-4 and related clutch hardware that slip usually damages first.
| Fits | 4L70E 2009 |
| Part type | Tcc Solenoid |
| Condition | New |
| Brand | OEM |
| Reference | 24237980 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is the reference number listed for this harness and TCC solenoid assembly. Match it against the number on your old harness or your catalog lookup, and send us your year and VIN if you want us to confirm fitment.
Yes. Transmission Digest documents input speed sensor wiring on the 4L70E chafing against the reverse input drum, which sets P0716 or P0717. Inspect the old harness insulation near the drums when you remove it.
Not necessarily. This family uses controlled-slip lockup, so a small steady slip is normal. Slip that never comes down after lockup is commanded, or lockup that is never commanded, is what points to a fault.
Always replace the filter and pan gasket. If the magnet shows clutch material, plan for a rebuild rather than just a harness. Fresh O-rings on any reused solenoids are cheap insurance.
It may, but harness layouts differ between the versions. Compare connector count and colors with the photo, or send us your year and VIN before ordering.
