2004 Chevy Impala. 3.4L.
Check engine light
codes = shift solenoid A
Question = I got this code out of the OBD2 and it says shift solenoid A. I assume this is the on/off solenoids located in the valve body? Which one is A when looking at the valve body. I have not pulled the pan yet. Is it hard to get off? I have a lot of experience swapping engines and transmissions, just don't know for sure if this will fix the issue or not. The fluid is a little dark like the tranny has been slipping and it does not shift quite right(slips sometimes). Did I catch it early enough or am I going to have to replace the whole tranny? Thanks for your help and will give donations when possible.


Answer:
Assuming no debre in the pan, and no other codes, then 1-2 shift solenoid should fix condition, although this car has a lot of miles on it. In order to get to solenoids, the transmission side cover will have to come off. This entails supporting the engine/trans. Assembly with support fixtures on top. Lowering the left side frame per manual instruction. IE- disconnect ball joint, steering shaft, axle, transmission side mount, shields, brackets, harnesses, etc. The 1-2 shift solenoid is on the left side of the valve body, middle way up.
Problem with my 2003 Chevy Impala 3400 V6.
Repair work done prior = no work done. Car was working perfect.
Work done to repair this problem = changed filter. Dropped pan and looked at oil pump.
GM tech = gm mechanic
question = the oil filter seal blew out. Replaced filter and the same thing happened. Last oil change was 5000kms ago. Seems to be building pressure. Seal blows out in about 8 to 10 seconds.
Answer:
Sounds like the pickup screen is plugged, or the pressure relief valve is stuck.
If the screen becomes clogged, oil may be drawn into the system through the oil pressure relief valve in the oil filter adapter. Oil is drawn into the pump through the screen and pipe assembly, and a passage in the crankcase, connecting to the passages in the engine front cover. Oil is discharged from the oil pump to the oil filter adapter. The oil filter adapter consists of an oil filter bypass valve and a nipple for installation of an oil filter. The spring-loaded oil pressure relief valve, located in the engine front cover, limits the oil pressure. The oil filter bypass valve opens when the oil filter is restricted to approximately 68.95 kPa (10 psi) of pressure difference between the oil filter inlet and discharge. The oil will then bypass the oil filter and channel unfiltered oil directly to the main oil galleries of the engine.
2004 Chevy Impala Shift Solenoid Codes

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