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Old 01-09-2020, 05:38 PM   #1
Dsaturn
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2001 L-Series 2.2L Sedan
Default P0746

So I keep getting the p0746 and have to manually shift up and down. I understand it is most likely the pressure control solenoid, I Have 209k on the trans and I am about to do the service (Filter fresh fluid) on the trans. Should i replace all the solenoids while I am in there? Also the one manual says Unthread the bolts or screws on the "fix plate" and remove it. What are they referring to when they say fix plate?

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Old 01-10-2020, 05:54 AM   #2
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2001 L-Series 2.2L Sedan
Default Re: P0746

Also having a hard time with location of part. Is it under Trans oil pan or does the side plate need to come off?

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Old 01-12-2020, 01:16 PM   #3
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2000 L-Series 2.2L Sedan
Default Re: P0746

This is a late reply to your posts, but all transaxle control solenoids are located at its far left end (driver side) at the valve body. If you remove your left front wheel you can see a "rectangular-like" shaped cover at that side of the transmission. While the cost of the individual solenoids is relatively inexpensive, removing the cover to gain access to the solenoids is a major undertaking and is extremely labor intensive. It requires an engine support brace to be in place beforehand and the far left (transmission) mount and bracket - which is beneath the battery and fuse box tray - must be removed. There is another member who did this job on his own. He described the whole process and it took several hours and may have been over the course of a couple of days. I can't recall this member's login name. Do a Google search perhaps with terms like "valve body," "pressure control solenoid," "replacing transaxle control solenoid" to find it. It's likely to be more difficult to find the thread through the Advanced Forum Search feature.

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Old 01-12-2020, 02:28 PM   #4
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2002 L-Series 2.2L Sedan
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Default Re: P0746

I subscribe to a British auto repair magazine Car Mechanics . I enjoy all the articles about the Vauxhalls we will never see over here. There are many differences in mechanical terms in the English language. It sounds like you have found a British set of instructions for your transmission repair.

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Old 01-12-2020, 02:38 PM   #5
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Default Re: P0746

I have the problem that when its really cold fans run on high. The day this code showed up was 29F and highway speeds. Engine running cold code came up also. I erased the codes with my cheap reader the next day when it was 55f. Code has not come back as it did 5 times in the cold on trip to Maryland and back. Trans is shifting normal now that normal temp is reached.. My hypothesis is that the combo of new radiator and fan running making engine really cold confused the pcm making Torque converter not unlock. Time will tell, will report back if there is a change when weather turns cold again.

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Old 01-12-2020, 03:00 PM   #6
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Default Re: P0746

Quote:
Originally Posted by Dsaturn View Post
I have the problem that when its really cold fans run on high. The day this code showed up was 29F and highway speeds. Engine running cold code came up also.....
P0128? This usually means the t-stat is worn out or leaking coolant fast enough to alter normal warm up, triggering the error code. If coolant temps takes longer to warm up, other issues may appear as a cascade effect. Fans running with a cooler than normal operating temperature may be a default in programming to ensure the engine isn't overheating from false errors. Electronics and computers are smart only if their sensors are functioning. Once a sensor fails or sends incorrect signals, limited programming triggers error an code but in a narrow frame of logic. A faulty t-stat operating colder than normal is detected and either triggers a P0128 code or cause other error codes that may not point to a faulty t-stat and point elsewhere, misleading anyone in chasing false error codes. The problem in certain situations may be in interpreting information and sometimes thinking outside the box as man is in the only position to think. No computer program will ever duplicate human thinking.

Tesla with its Autopilot command to drive autonomously is still in its teething phase due to the varying dynamics of driving no computer memory is large enough to memorize. Humans make untold calculations while driving when not distracted. Computers do not have the capacity yet to handle the calculations of a changing environment. Man lets go of useless info and continually adapts to new info. Computers cannot do this yet.

What are coolant temps?

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