48RE Internal Wiring Harness, new and ready to install. Fits the 48RE. Ships fast from the USA.
A Ram with a 48RE that will not shift into overdrive, will not lock the converter at cruise, drops into third-gear limp mode, or sets P0743, P0753 or P1740 very often has a problem inside the pan rather than a failed transmission. This part is the internal wiring harness assembly: the overdrive and torque converter clutch (lockup) solenoids on their bracket, the internal harness, the round 8-pin case connector, and the pigtail that plugs into the valve body side. On the RE family these pieces are serviced as one assembly, so this is the part you replace when either solenoid or the harness has failed.
The 48RE makes its 1-2 and 2-3 shifts hydraulically using governor pressure. The only electrical shift solenoid is the overdrive solenoid, which controls the 3-4 shift, and it shares a bracket with the TCC solenoid. Per ATSG's pinout, pin 1 of the 8-pin case connector supplies 12 volts to the valve body solenoids, and the PCM turns the overdrive solenoid on by grounding pin 6 and the TCC solenoid by grounding pin 7. On the 48RE the TCC solenoid is fed forward clutch oil, a change Transmission Digest's Wayne Colonna describes in detail, which is why a sticking TCC solenoid on this unit can stall the engine in Drive.
Check that the overdrive switch is not in tow/haul OD-off mode first. Then unplug the case connector and ohm the transmission side: pin 1 to pin 6 and pin 1 to pin 7 should each read about 25-40 ohms per ATSG, with no continuity from any pin to the case. A good reading with no 12 volts on the vehicle side of pin 1 points to the transmission control relay or wiring, not this part. Our 48RE shift solenoid testing guide has the full step-by-step, and the Ram 2500 Cummins shift problems guide helps separate electrical faults from overdrive clutch wear.
This harness and solenoid kit is listed for the Chrysler 42RE, 44RE, 46RE, 47RE and 48RE, with a round 8-pin case connector, under reference number 52118652. The 48RE itself was used in 2003-2007 Ram 2500/3500 trucks with the 5.9L Cummins. ATSG notes that these harnesses are model-sensitive because the governor pressure and fluid temperature sensor went through four design levels, each with its own connector. Compare the pigtail plug on this harness to the connector on your governor pressure sensor before you order, or send us your year and VIN and we will check. Browse everything for this unit on our 48RE parts page.
Because the pan is already down, many owners replace the governor parts at the same time with the 48RE solenoid and filter service kit. On 2005-up diesel trucks with throttle valve actuator codes, the 48RE throttle valve actuator 53041140AB is the other electrical part worth checking.
| Fits | 48RE |
| Part type | Internal Wiring Harness |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. On the RE transmissions the overdrive and TCC solenoids are part of the internal harness assembly, so this kit includes both solenoids on their bracket, the internal harness, the 8-pin case connector and the governor sensor pigtail.
It is listed for the 42RE, 44RE, 46RE, 47RE and 48RE with an 8-pin round case connector. Because the governor pressure sensor connector changed over the years, compare the pigtail plug to your sensor, or send us your year and VIN to confirm.
Common ones are P0743 and P0753 for the TCC and 3-4 solenoid circuits, P0740 for no RPM drop at lockup, P0783 for no RPM drop at the 3-4 shift, and P1740 for TCC/overdrive solenoid performance.
Unplug the case connector and measure pin 1 to pin 6 (overdrive) and pin 1 to pin 7 (TCC). Each should read about 25-40 ohms with no short to the case. Also confirm 12 volts on pin 1 from the vehicle side before condemning the harness.
No. The assembly is on the valve body, so it is replaced with the pan dropped. Plan on a new filter, pan gasket and case connector O-rings, then refill with ATF+4.
On a 48RE, stalling in Drive but not in Reverse is a classic sign of a mechanically stuck TCC solenoid, which is part of this assembly. Rule out an idle or engine problem first.
