Replaces the EPC, TCC, PWM, 3-2 and shift solenoids plus the internal harness on 2003-2007 GM 4L60E and 4L65E valve bodies in one pan drop.
This kit is for the 2003-2007 Chevy and GMC trucks and SUVs with a 4L60E or 4L65E, the Silverado and Sierra 1500, Tahoe, Yukon and Suburban era, where an aging internal harness and a tired EPC solenoid are behind a large share of shift complaints. It replaces the electrical side of the valve body in one job: the EPC pressure control solenoid, the TCC and PWM solenoids, the 3-2 downshift solenoid, shift solenoids A and B and the internal wiring harness. As pictured, the kit also includes a pan filter, a pan gasket and the pressure switch manifold, so you are not making a second parts run once the pan is down. Manufacturer part number SSCDDCF01.
On these late units the PCM controls everything through the harness that runs across the bottom of the valve body. Shift solenoids A and B select the four gears, the EPC solenoid regulates line pressure from moment to moment, the TCC and PWM solenoids apply and feather the converter clutch, and the 3-2 solenoid manages kickdown timing. The pressure switch manifold tells the PCM which range the manual valve is in. The harness is the weak link that often gets overlooked: it lives in hot fluid, its insulation hardens with age, and its connector locks crack. GM took this seriously enough that service bulletin PIP5009G, written for 2012 trucks with this transmission family, tells technicians to replace the internal harness and TCC enable solenoid any time transmission repairs are performed. That is the reasoning behind a kit that renews the harness and every solenoid together instead of one part at a time.
When a 2003-2007 truck drops into limp mode with a stack of solenoid codes, check power before parts. ATRA bulletin 1244 calls loss of voltage to the solenoid power supply the most likely cause of that condition, and points at a worn ignition switch that adds resistance in the feed; it advises that the voltage at the transmission fuse should match battery voltage with the key on, and that a drop of half a volt or more is suspect. Trucks from 1999 on also route that feed through an underhood electrical center, so check it too. If the feed is good, unplug the case connector and test each solenoid circuit, and wiggle the harness while watching live data for dropouts. If only shift quality or lockup is off with good electrical readings, the valve body is the next suspect; Sonnax lists the bore wear points behind these complaints in its Sure Cure kit material. Our EPC pressure control solenoid guide and the 3-2 downshift solenoid guide cover the tests in detail.
The listing covers 2003-2007 GM 4L60E and 4L65E applications in Chevy and GMC trucks and SUVs. The 2003-up transmission uses a different TCC, PWM and harness layout than 1993-2002 units, so confirm your transmission build date from the case tag and compare the connectors on your valve body with the product photos before installing. Some published listings for this part number mention a 46RE or Dodge fitment; disregard that, as this kit is for the GM 4L60E and 4L65E only. Send us your year and VIN if you want us to double-check, or browse the 4L60E parts collection for other year ranges.
Drain the fluid, drop the pan and pull the filter, then release the case connector and lift out the old harness. Pull the clips on shift solenoids A and B, unbolt the EPC and 3-2 solenoids, and remove the TCC/PWM solenoids and pressure switch manifold. Lubricate each O-ring lightly with ATF, install the new parts and torque the valve body bolts to the factory spec. Clip the new harness along the original route, seat the case connector until it locks, then fit the included filter and pan gasket and refill with Dexron VI. Clear codes and run a shift relearn with a capable scan tool before the road test. If the old fluid was burnt or the pan held clutch debris, budget for a rebuild such as the 4L60E master rebuild kit for 2004-2014, and replace tired cooler lines with a 6AN PTFE cooler line kit so the new solenoids see clean, cool fluid.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. It includes the internal wiring harness along with the EPC, TCC, PWM, 3-2 and A/B shift solenoids. As pictured it also comes with a pan filter, pan gasket and the pressure switch manifold.
It is listed for 2003-2007. Earlier 1993-2002 units use a different TCC, PWM and harness layout. For any year at the edge of the range, compare your connectors to the photos or send us your year and VIN.
No. Some listings for this part number mention the 46RE, but this kit is for the GM 4L60E and 4L65E only.
It can be, but check the solenoid power feed first. ATRA traces many multi-code limp mode cases to voltage loss through a worn ignition switch. If the feed is good and the harness or solenoids test bad, this kit replaces all of them at once.
Refill with Dexron VI ATF and check the level hot. Clear codes and run a shift relearn with a scan tool, then road test through all four gears with converter lockup.
