Auotmatic transmission makes rattling sound in park?

Tiny
ALOHA168
  • MEMBER
  • 2002 HONDA CRV
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 220,000 MILES
The car was running and all of a sudden it wouldn't go anymore. When step on gas, the car would not move at all, had to tow it home.I checked with OBD2 scanner and I had P0730, P0795 and a non related P0420x2. Went online and found out P0795 was the pressure control solenoid C. Replaced both B and C solenoids(1 set) and trouble still the same. Fluid level was good(almost to the top mark) and color was clear. Started car and shifted through all gears and put it back on Park. After that, the rattling sound came back. What else could go wrong?Torque converter, bearings, etc?Please help.
Sunday, October 27th, 2024 AT 6:59 PM

14 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It sounds like you have a cracked flex plate but if you upload a short video of the noise, I can tell for sure what is wrong.
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Monday, October 28th, 2024 AT 1:01 PM
Tiny
ALOHA168
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I will make the video later. By the way, I have abrand-new external transmission filter that I have not changed yet. Does it matter if I change it or not?
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Monday, October 28th, 2024 AT 1:31 PM
Tiny
ALOHA168
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Video1
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Monday, October 28th, 2024 AT 3:44 PM
Tiny
ALOHA168
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Video2
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Monday, October 28th, 2024 AT 3:45 PM
Tiny
ALOHA168
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Video3
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Monday, October 28th, 2024 AT 3:46 PM
Tiny
ALOHA168
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Video1 and 2 sound closer to normal? Video3 makes a sharp noise at the beginning and the end.I could not get the rattling sound from yesterday. If you need more videos, let me know.
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Monday, October 28th, 2024 AT 3:52 PM
Tiny
KEN L
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Yes, you need to change the external filter. To me it sounds more like a catalytic converter has broken apart internally, I would shut the engine off and then use a rubber hammer to tap on the exhaust system to see if you duplicate the noise. Thanks for the videos they helped. Let me know.
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Tuesday, October 29th, 2024 AT 10:55 AM
Tiny
ALOHA168
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How can a catalytic converter affect the auto transmission?The car wouldn't go and gave me P0730 and P0795.I thought they are 2 separate issues.I'm confused.I will change the external filter.
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Tuesday, October 29th, 2024 AT 11:48 AM
Tiny
KEN L
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Yep, it would cause those codes I was going off of the noise, you might have two problems.

P0730 - Incorrect Gear Ratio:

P0795 - Pressure Control Solenoid “C” Malfunction:

So, what happens is the front fluid pump can go out and cause solenoid codes or you have a bad connection. Also, with the p0730 have you replaced the counter shaft sensor? I have seen this sensor get weak and cause this code. Here is a guide to help check the connection and the wiring diagrams so you can see which wires to test.

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please let us know what happens.
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Wednesday, October 30th, 2024 AT 9:08 AM
Tiny
ALOHA168
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I'm still confused. Do you mean the P0420 is related to the auto trans codes? I also heard the rattling sound from the driver's side (the transmission) before. And the catalytic converter is on the passenger's side. On the main shaft and countershaft speed sensors you mentioned, I can't find them online even at the Honda parts websites. What are their correct names or part numbers to search for? If I can't find any, should I just remove and clean them and put them back? Is there any way to test them while removed? The main is A and counter is B? What about the cracked flex plate now?
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Wednesday, October 30th, 2024 AT 1:54 PM
Tiny
ALOHA168
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I also have a P780 code with D blinking when I drove around the block before I changed solenoid C(B+C). What else I should check?
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Wednesday, October 30th, 2024 AT 2:10 PM
Tiny
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I checked again today and noticed a have a small leak at the cover bottom of part #17 of the picture attached which I've never noticed before. And it's in the general area where I heard the rattling sound before. Partt 17 is the plug which attaches to 4 connectors of solenoids A, B, C&E(no D).I've found a set of these solenoids online with 5 solenoids(A, B, C, D&E) which they say will fit my car). Should I give it a try, I just use only 4 solenoids?
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Wednesday, October 30th, 2024 AT 3:36 PM
Tiny
ALOHA168
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Sorry, it's #17 and 9 in the picture.
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Wednesday, October 30th, 2024 AT 3:38 PM
Tiny
KEN L
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The pressure C malfunction can be a pressure issue as well and with an incorrect ratio it is telling us the transmission may need to be rebuilt FYI.
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Thursday, October 31st, 2024 AT 1:46 PM

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