I have an engine light on and i did one of those downloads from the auto part store. The code is P0751 Shift solenoid A CKT performance or stuck off. Anyone know what this code is? the car shifts fine. need your help.

 

i pulled the same code last night... my SES light came on sitting at a stop light and my tranny went into limp mode... i pulled over shut the car off for a min... fired it back up and everything was fine. I used my OBD2 scanner and reset the code and it hasnt set agian.... so i dont know... maybe someone will chime in on this

 

Did you recently put that stall in or has it been a while?? I got that code shortly after I put my stall in, but it shifts just fine so I wasn't too concerned about it. Once in a while the trans will go into limp mode but I just shut it off for a few seconds and fire it back up and it's fine.

 

The 1-2 shift solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The 1-2 SS valve is a normally-open exhaust valve that is used with the 2-3 SS valve, in order to allow four different shifting combinations.

When the PCM detects a 1-1-4-4 or a 2-2-3-3 shift pattern, depending on the state of the mechanical failure, then DTC P0751 sets. DTC P0751 is a type A DTC.

Conditions for Running the DTC
No TP sensor DTCs P0122 or P0123.
No VSS assembly DTCs P0502 or P0503.
No TCC solenoid valve DTC P0740.
No TCC stuck ON DTC P0742.
No 1-2 SS valve DTC P0753.
No 2-3 SS valve DTC P0758.
No 3-2 SS valve assembly DTC P0785.
No TFP manual valve position switch DTC P1810.
No TCC PWM solenoid valve DTC P1860.
The engine speed is greater than 450 RPM for 5 seconds.
The engine is not in fuel cutoff.
The TP angle is 10-35%.
The TP angle is constant +/-5%.
The gear range is D4.
The transmission fluid temperature is 20-130°C (68-266°F).
The PCM commands a 1-2, 2-3, and 3-4 shift.
The TCC is commanded ON.
The vehicle speed is greater than 8 km/h (5 mph).
Conditions for Setting the DTC
DTC P0751 sets if the following conditions occur three times:

Within 2 seconds, the engine speed in 2nd gear is 80 RPM greater than the last speed in 1st gear.
Within 2 seconds, the engine speed in 3rd gear is 50 RPM less than the last speed in 2nd gear.
Within 2 seconds, the engine speed in 4th gear is 10 RPM greater than the last speed in 3rd gear.
All of the above conditions are met and one of the following conditions occurs:

Condition 1
The speed ratio is 0.95 to 1.2 (speed ratio is engine speed divided by transmission output speed).
The TCC slip speed is 200-1000 RPM for 4 seconds.

Condition 2
The speed ratio is 0.65 to 0.8.
The TCC slip speed is -20 to +40 RPM for 4 seconds.

Action Taken When the DTC Sets
The PCM illuminates the malfunction indicator lamp (MIL).
The PCM commands D2 line pressure.
The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph).
The PCM freezes shift adapts from being updated.
The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
The PCM stores DTC P0751 in PCM history.

that is from GM's flow chart for the code. looks like you should just ingore it as the stall converter you installed is causing the problem.

 

If you have larger than a 3000 stall you need to turn that code off. P0757 should also be turned off. I had Mikey at Rapid turn mine off and I dont go into limp mode. I researched this back when I was having the problem and the PCM thinks the larger stall TC is slipping therefore throws the code. Turning it off has worked for almost a year for me now with no problem.

 

It happens to be that the PCM pulled back up the code again from its history. I don't know why. They said to disconnect the battery to reset the PCM. So I did and the light didn't come back on. Thank for all the help everyone.

 

The code came back on now. It's annoying the **** out of me. I have a 4k tc. I've had the car for 9months and added about 8k miles. Would I need to change the fluids? I've only gone to the track twice and ran twice each night. I really don't abuse it.

 

GUess i'll post since I haven't posted my way around it in over a year or so now.

but anyway
figure out where your ocnverter locks up (mine locks up at 45mph) while driving around town or in traffic put the selector in 3rd or D. Once the car gets up to lockup speed (I do around 50) let off the gas and push the selector in 4th or OD

My convertor unlocks at 40mph and when I drop below that I put the selector back in 3rd of D

Good luck, but I have been doing this for over 2 years and I never throw the code anymore

 

I've already had to rebuild my tranny, becuz a soleniod was bad. Is there any performance soleniods or can I buy soleniods from the auto parts store? The solenoids is about $8.