6T70 Internal Wiring Harness, new and ready to install. Fits the 6T70. Ships fast from the USA.
This listing is titled as a 6T70 internal wiring harness, but the part number on it, GM 24229665, is the internal harness for the 4T40E and 4T45E four-speed transaxle, not the six-speed 6T70. GM's parts catalog lists 24229665 for 2004-2011 small and midsize cars such as the Chevrolet Cavalier, Cobalt, HHR and Malibu, Pontiac G5, G6, Sunfire and Grand Am, Saturn Ion, L300, Aura and Vue, and Oldsmobile Alero. If you own one of those with a four-speed automatic and you are chasing intermittent shift solenoid codes, harsh shifts or a sudden limp mode, this is the right harness. If your vehicle has a 6T70, it does not use this part, and the sections below explain why and where to look instead.
On these transaxles the control computer sits outside the transmission. A single case connector passes the signals through the case wall, and this internal harness carries them from that connector to each component inside the side cover: the two shift solenoids, the pressure control solenoid, the converter clutch solenoid, the fluid temperature sensor and the pressure switch circuit. GM's catalog data describes a harness with a 13-pin case-side end, 16 wires and seven connectors. Heat, vibration and old fluid harden the insulation over time, the terminals loosen, and the result is a fault that comes and goes with temperature.
The 6T70 and 6T75 are built around a TEHCM, a Bosch-built 32-bit transmission control module bolted directly to the valve body with the shift and pressure control solenoids attached to it. According to ATRA's 6T70 introduction, a spring-loaded bracket holds that module against a heat sink on the valve body. There is no separate 13-pin internal harness like this one. On a 6T70, electrical shift faults are diagnosed at the TEHCM, the solenoid body and the pressure switches, which our 6T70 common problems guide covers in detail.
Check the outside first. Unplug the case connector and look for fluid wicking past the seal or bent pins, and inspect the external harness and the computer connector. Then measure solenoid resistance through the case connector both cold and hot; a reading that changes or goes open when you flex the harness points inside. If the readings are steady, the problem is more likely a solenoid or the valve body. For a 6T70 instead, start with our 6T70 shift problems diagnosis guide.
This harness is GM 24229665, which the GM catalog shows replacing earlier number 24217545. Match the part number on your old harness, or the 13-pin connector and connector count, before ordering. Many of the listed cars were offered with more than one transmission: four-cylinder versions of the Malibu, G6, Aura and Vue used the four-speed, while some V6 versions used a 6T70 or another unit. If in doubt, send us your year and VIN. You can browse the correct parts on our 4T40E / 4T45E parts page, and 6T70 owners can find their parts on our 6T70 parts page.
| Fits | 6T70 |
| Part type | Internal Wiring Harness |
| Condition | New |
| Brand | OEM |
| Reference | 24229665 |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Part number 24229665 is the 4T40E/4T45E internal harness. The 6T70 uses a TEHCM with the solenoids mounted to the control module on the valve body, so it has no separate harness like this.
GM's catalog lists it for 2004-2011 cars including the Chevrolet Cavalier, Cobalt, HHR and Malibu, Pontiac G5, G6, Sunfire and Grand Am, Saturn Ion, L300, Aura and Vue, and Oldsmobile Alero with the four-speed automatic.
The GM catalog shows 24229665 replacing 24217545. Compare the number on your old harness, or the 13-pin connector, before you order.
Dexron VI. Use a new side cover gasket, then check the level hot with the engine running.
Clearing codes and a thorough road test are usually enough. If the computer had stored adaptive values while the harness was failing, a scan tool reset of transmission adapts lets it relearn shift quality.
