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PO747 and PO743 Fault Codes in 1999 Hyundai Elantra: Linked to Transmission Pressure Control Recall?

Model: 1999 Hyundai Elantra Fault Code: P0743 Posted: 2007-03-12 14:27

I recently received PO747 and PO743 diagnostic codes on my 1999 Hyundai Elantra. I'm aware of a recall related to the automatic transmission pressure control valve, and I want to confirm whether this recall is directly responsible for these fault codes. My mechanic has recommended replacing the transmission pressure control solenoid as part of scheduled service due to recurring transmission issues. Is this repair truly addressing the root cause? The recall specifically involves a seal in the transmission, not the solenoid itself. It's important to note that fluid leaks from this seal can prevent proper pressure buildup needed for overdrive engagement—explaining why overdrive fails while other gears function normally. I'm seeking clarity on whether replacing the solenoid or addressing the recall-related seal is more effective in resolving these codes and improving transmission performance.

Related fault codes
P0743P0747
Comments (3)
Anonymous 2007-03-12 15:42

The pressure control valve is less likely to be the root cause than the speed sensors—specifically the A or B pulse generator sensors. These are common failure points on Hyundai vehicles, especially older models like the 1999 Elantra. I recommend checking those first before assuming it's a solenoid issue. Good luck and please update us on your progress!

Anonymous 2007-03-12 17:31

You mentioned earlier that this is a common problem—were you referring to the speed sensors or just the recall-related component?

Anonymous 2010-09-27 20:51

This issue is not particularly common in the 1999 model year. While replacing A/B speed sensors might be an option, it may not resolve the underlying problem. The transmission valve body contains many intricate components, and repairs can be complex and costly. The recall specifically addresses a seal failure—not the solenoid itself. Consider this: if overdrive fails but all other gears operate normally, it's likely due to insufficient fluid pressure caused by a leak in that seal. Without adequate pressure, the transmission cannot engage overdrive. This explains why many 1999 and early 2000 Elantras exhibit this behavior. The fix should focus on addressing the recall-related seal rather than just replacing solenoids.