1995 42re Limp mode - North American Grand Cherokee Association

Slo-Sho · 01-29-2009, 01:23 AM

Just recently acquired a new to me 95 ZJ with the 42re that doesn't like to shift by itself. The governor solenoid and transducer (3 pin) were both replaced. I also tried another TCU from the the same year ZJ with no change. I've also discovered that when the TCU commands the O/D solenoid to energize, the trans goes into limp mode. It will shift 1,2 and 3 hot or cold no problem. My next step is to replace the O/D and TCC solenoid assembly. Has anyone ever had those go bad? Also the O/D light does not ever illuminate and the bulb is good so I can't tell what, if any codes are stored.

Slo-Sho · 02-05-2009, 09:30 AM

*update*

I ended up replacing the O/D and TCC solenoid assembly even though I kept getting a code 21 (governor circuit). I also gave the trans temp sensor it's own ground instead of sharing it with the governor circuit. Not wanting to replace the entire trans harness I opted to use the solenoid assembly from the 42RH which has a 3 pin connector, I simply cut and spliced the 3 wires into the original harness. It's been 100 miles now, so far so good....

GreenZJ · 02-05-2009, 09:32 AM

sweet! i love it when people actually give us an update on the solution to their problem. thanks man!

01-29-2009, 01:23 AM	#1
Slo-Sho Junior Member Grand Rookie Join Date: Oct 2006 Posts: 3	1995 42re Limp mode Just recently acquired a new to me 95 ZJ with the 42re that doesn't like to shift by itself. The governor solenoid and transducer (3 pin) were both replaced. I also tried another TCU from the the same year ZJ with no change. I've also discovered that when the TCU commands the O/D solenoid to energize, the trans goes into limp mode. It will shift 1,2 and 3 hot or cold no problem. My next step is to replace the O/D and TCC solenoid assembly. Has anyone ever had those go bad? Also the O/D light does not ever illuminate and the bulb is good so I can't tell what, if any codes are stored.

02-05-2009, 09:30 AM	#2
Slo-Sho Junior Member Grand Rookie Join Date: Oct 2006 Posts: 3	It's alive! update I ended up replacing the O/D and TCC solenoid assembly even though I kept getting a code 21 (governor circuit). I also gave the trans temp sensor it's own ground instead of sharing it with the governor circuit. Not wanting to replace the entire trans harness I opted to use the solenoid assembly from the 42RH which has a 3 pin connector, I simply cut and spliced the 3 wires into the original harness. It's been 100 miles now, so far so good....

02-05-2009, 09:32 AM	#3
GreenZJ Senior Member Grand Master Join Date: Jan 2008 Location: ohio Posts: 3,284	sweet! i love it when people actually give us an update on the solution to their problem. thanks man! __________________ '98 Platinum 5.9L Limited-A few upgrades

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