Seven-piece solenoid set plus pressure switch, harness, filter and pan gasket for 2003-2005 GM 4L60E and 4L65E (M30/M32) transmissions.
This master kit is for the person who wants every electrical part on a 2003-2005 GM 4L60E or 4L65E valve body replaced at the same time, with nothing left to fail next month. If your Silverado 1500, Sierra 1500, Tahoe, Yukon, Suburban or Express van is throwing shift solenoid performance codes, slipping the converter, or shifting firmly one day and softly the next, the seven solenoids, manifold pressure switch, internal harness, filter and pan gasket in this box cover every electrical cause of those complaints. It fits both RPO M30 (4L60E) and M32 (4L65E) units from those three model years.
The computer runs this transmission through seven solenoids. Shift solenoids A and B select first through fourth by switching on and off in pairs, so either one failing changes the gear the truck is actually in. The EPC solenoid is a variable-current valve that sets line pressure for every clutch and band; when it wears, shift quality swings with temperature. The TCC solenoid opens the lockup passage and the TCC PWM solenoid ramps the converter clutch apply. The 3-2 solenoid controls how the 3-4 clutch releases against the 2-4 band on a kickdown. The manifold pressure switch, also called the TFP switch, is a set of pressure contacts that tell the computer which range the manual valve is in, and its signal is used to decide shift and pressure commands.
A performance code does not always mean a bad solenoid. It means the computer commanded something and the ratio did not follow, which can also be worn valve body bores or a slipping clutch. Start with fluid condition and level, then check solenoid resistance at the case connector. If the electrical side tests good and the code returns, Sonnax recommends vacuum testing the valve body rather than guessing, because bore wear is common in the 4L60-E family and causes the same codes. P0741 on these trucks is frequently bore wear in the converter clutch circuit, so read our TCC solenoid diagnosis guide and the EPC pressure control solenoid guide before ordering. If you have confirmed the fault is electrical and the unit has high miles, replacing the full set is cheaper than chasing one part at a time.
The kit is year specific: 2003, 2004 and 2005 GM 4L60E (M30) and 4L65E (M32) only. GM changed the harness and pressure switch for the 2006 model year and used a different layout from 1993 to 2002, so the parts here will not plug into those units correctly. It crosses to GM numbers including 24227747, 24227792, 24212690, 24212327, 24209121, 24215111, 24219581 and 24230298. Compare the numbers on your old parts, check the RPO code on your glove box sticker, or send us your year and VIN. More year-matched parts are on the 4L60E collection page.
If you are lowering the valve body anyway, clean it thoroughly; the heated ultrasonic parts cleaner clears varnish from the bores. Trucks that tow benefit from the extra fluid in the deep aluminum pan kit.
| Type | Master solenoid kit |
| Fits | GM 4L60E, 4L65E (M30/M32), 2003-2005 only |
| Includes | A/B shift, 3-2, EPC, TCC PWM, TCC solenoids, pressure switch, harness, filter, pan gasket |
| Weight | 3.5 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
M30 is GM's RPO code for the 4L60E and M32 is the code for the heavier 4L65E. Both are listed on the service parts sticker in the glove box. This kit fits both for 2003-2005.
Yes. The manifold pressure switch, also called the TFP switch, is included along with the seven solenoids, the internal harness, a filter and a pan gasket.
Only if the cause is electrical. P0741 means the converter clutch is slipping, and on 4L60E units that is often wear in the valve body or converter. Test the TCC circuit first and read our TCC diagnosis guide before replacing parts.
Yes. Clear the codes and run the transmission adaptive relearn with a scan tool. Skipping it can leave shifts harsh or erratic until the computer slowly relearns on its own.
Yes. Everything in the kit is reached by dropping the pan. Plan on a few hours with basic hand tools, a torque wrench and a drain pan.
