cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
  
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| suspension fault and errors |
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I've been having a problem with my suspension - the rear left goes down overnight. I recently replaced the front valve block.
The code being given is per the attached pictures: C1A13 - Pressure does not decrease when venting gallery
and U0421 invalid data received from ride level control module.
I've checked for leaks around the rear valve block but couldn't find anything.
Don't really want to randomly replace the compressor and the two other valve blocks without knowing what's causing the issue.
Any idea what could be the problem?
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 3rd Jun 2019 4:39 pm |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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From reading up, it seems that this error is when the compressor exhaust can't vent.
Do I need to replace the compressor to fix the error?
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| 4th Jun 2019 5:39 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
 
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Why did you replace front valve block when the rear was going down. "U" codes are information. You can clean and refurbish the compressor including the exhaust valve. Kits are available cheaply, get one with the metal end cap. Use soapy water to spray on the components to check for leaks. Do not forget the compressor filter end cap as these are know to crack.
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| 4th Jun 2019 10:26 am |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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Ha!
first the front was going down so I replaced the front block.
Now it's the rear going down.
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| 4th Jun 2019 10:31 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
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You can get kits to refurbish the valve blocks although rear is a little harder to get to
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| 4th Jun 2019 10:52 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
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The kit for the valve blocks are totally different to the kit for the compressor. You would need to purchase both kits to overhaul compressor and valve blocks.
With the compressor kit make sure you get one with a metal end cap in the kit
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| 6th Jun 2019 9:12 am |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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so I'm slightly confused. With the error message and symptoms that I have do I just need to refurbish the compressor or also fix the rear valve blocks?
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| 6th Jun 2019 9:42 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
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The original problem you reported was one rear corner sinking down - this can be the valve block or a leak somewhere. Not sure why you thought compressor
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| 6th Jun 2019 10:28 am |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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I was assuming that the error code aboutnnot venting was because of the corner going down. I occasionally get a yellow or red suspension error on the dashboard and turningthe engine off and on clears it. . Is it likely that there are two separate issues both affecting the suspension?
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| 6th Jun 2019 10:44 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
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If the vehicle has done a lot of k's then overhauling the compressor is a good thing relatively cheap for a getting a few more thousand k's. doing the valve blocks will also give peace of mind knowing they are ok so suggest you do both.
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| 6th Jun 2019 10:53 am |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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83000 miles so not particularly high. I don't have convenient access to a lift or a lot of time so I may start by just replacing the valve block
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| 6th Jun 2019 11:00 am |
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Globetrotter448
Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1781
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Check "You Tube" on how to access the rear valve block as it is not easy.
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| 6th Jun 2019 11:23 am |
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cestor
Member Since: 20 Sep 2010
Location: Israel
Posts: 160
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when you say the rear valve block, aren't there two rear valve blocks, one adjacent to the compressor?
If I was going to replace, which one is it?
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| 6th Jun 2019 12:16 pm |
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