Intermittent voltage to transmission

PAPAW W

MEMBER
1994 PLYMOUTH VOYAGER
3.0L
6 CYL
FWD
AUTOMATIC
88,000 MILES

Car was stuck in Limp Mode. Changed shift solenoid pack and the two speed sensors.
Still in limp mode.
Took it to a shop and they cleared the computer.
Still in limp mode.
Checked plug on the Module to see if it was getting 12 volts.
When you turned the key, meter showed 12 volts. Then it went away!
Drove it home (30 mph), check engine light on.
It showed Codes 12, 37 and 15.
Help!

4 Replies

HMAC300

MECHANIC
48,601 POSTS

Code 12 means you disconnected battery, 15 means no speed sensor signal and 37 means no torque converter clutch. See pictures on how to diagnose things. But, I would start with the wire connection as you said that looks like a problem area.

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Tuesday, May 2nd, 2017 AT 12:44 PM

PAPAW W

MEMBER
3 POSTS

HMAC300,
Thanks for the information.
I was checking further and found the 15 amp transmission fuse was blown. Replaced fuse, reattached battery cables and went out and tried it again. It shifted from first to second and tried to go into third shifted, then went to neutral, then second again.
What do you think?

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Tuesday, May 2nd, 2017 AT 2:00 PM

HMAC300

MECHANIC
48,601 POSTS

Until you do those checks I sent I still have to suspect wiring either at transmission or between TCM /PCM because either of those can be bad causing the same problem. If the fuse blew it may have again due to a short in system.

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Tuesday, May 2nd, 2017 AT 3:24 PM

PAPAW W