TEST 1: 2-4 Shift Solenoid Resistance Test
OK, to get this show on the road, I'm gonna' ask you to check the resistance of the 2-4 Shift Solenoid.
You'll need to disconnect the solenoid pack's 8 wire connector and test the resistance of solenoid pack's pins #4 and #8.
Pin #4 is the one that feeds power (10 to 12 Volts) to the 2-4 Shift Solenoid and Pin #8 is the one that feeds the activation signal.
NOTE: It's best that you do this test with a cold engine or you run the risk of getting burned by a hot engine and/or transmission. Be careful, use common sense and think SAFETY.
OK, this is what you'll need to do:
Disconnect the solenoid pack's 8-wire electrical connector.
This is an on-car test, so you don't have to remove the solenoid pack to test it. If you already have it off -that's no big deal, you can still use the info in this test tutorial to check it.
Place you trusty multimeter in Ohms mode.
With the red lead, probe the metal male terminal labeled with the number 4 in the photo above.
Probe the metal male terminal labeled with the number 8 with the black multimeter test lead.
Your multimeter should register between 0.5 to 9 Ohms if the solenoid is OK.
Let's take a look at what your test results mean:
CASE 1: The multimeter registered the indicated Ohms. This tells you that the 2-4 Shift Solenoid (within the solenoid pack) is OK.
Since a trouble code P0755 is lighting up the check engine light on your instrument cluster, the next steps are:
- Check the continuity of circuit #8 between the Transmission Control Module and the solenoid pack's connector.
- Check the physical condition of the solenoid pack's connector and the round metal terminals inside of it for damage.
The above steps are beyond the scope of this article, but at least now you know what direction your troubleshooting needs to take.
CASE 2: The multimeter DID NOT register the indicated Ohms. Double check that you're testing the correct metal male terminals on the solenoid pack and retest.
If you still don't see the indicated resistance in Ohms, then the 2-4 Shift Solenoid is bad. You'll need to replace the solenoid pack assembly to resolve the problem.
2-4 Shift Solenoid Test Conclusion
Over the years, working as diagnostic tech in an automotive repair shop, I've replaced quite a few bad Chrysler solenoid packs, so in this section, I want to share a couple of personal suggestions that I think will help you:
- Whenever any of the shift solenoids, inside the solenoid pack, go bad, the transmission will go into LIMP IN mode. This means the transaxle (this is the correct technical name for a front-wheel drive automatic transmission) will stay and run in 2nd gear only.
- A bad 2-4 Shift Solenoid will not cause your transmission to slip.
- If your vehicle's transaxle is slipping, then replacing the solenoid pack will not help since slippage is a direct result of internal transaxle damage (burned clutch discs, broken/worn internal hard parts, etc).
- Can a bad solenoid pack cause the transaxle to go bad?, the answer is YES if you don't take care of the problem as soon as possible and/or continue driving it for extended amounts of time/distance in LIMP IN mode.
Hope this tutorial helped!
Chrysler Transmission Solenoid Pack Tutorials
The following tutorials relate to this transmission solenoid pack tutorial:
- Testing Diagnostic Trouble Code P0750 (Low Reverse Shift Solenoid Malfunction).
- How To Test Diagnostic Trouble Code P0760 (Overdrive Solenoid Malfunction).
- How To Test Diagnostic Trouble Code P0765 (Shift Solenoid D Malfunction).
If this info really saved the day, buy me a beer!