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raftrey
Member Since: 29 Oct 2006
Location: wigan
Posts: 59
  
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| Can anyone help with fault code U2023 plz? |
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Over the last couple of days my MIL light has been coming on. My friend has a code reader which says PO172,PO175 and U2023 are present. The first two are explained but the third just says 'vehicle specific' and i just wondered if anyone could shed some light on it.
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 11th Feb 2009 9:49 pm |
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wiggs
Member Since: 03 Sep 2006
Location: Manchester
Posts: 14368
 
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Found this on google ..not sure if its correct though
External Node Fault DTC U1900, U2023 are communication codes. they appear when there is module to module communication error, G4 Gone ...but not forgotten
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| 11th Feb 2009 10:00 pm |
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tintenter
Member Since: 29 Sep 2006
Location: Oldham
Posts: 1109
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also found this via google
U1900, U2023, U2202, U2523
- Communication error with PCM is detected in CAN communication
POSSIBLE CAUSE
• CAN system wiring harness open or short circuit with PCM
• PCM malfunction
U2023 Abnormal message from PCM EHPAS control module (See PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION.)
http://www.thaimazda3.com/svmanual/esicont...#wp1025486 Tintenter
Corris Grey Discovery 4 HSE
Bigger permagrin now installed
Semper in excretum, sole profundum moveat.
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| 11th Feb 2009 10:06 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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can't see that code in the V8 ECM DTC list.... which module is it from? 'U' codes are generally missing / lost comms and are transient by nature - any other warning lights on?
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| 11th Feb 2009 10:09 pm |
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raftrey
Member Since: 29 Oct 2006
Location: wigan
Posts: 59
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There are no other lights on and the car seems to run fine with the MIL light on, but when i clear the codes within 10 miles or so it comes back on. I thought it could be the LPG system so i ran it on petrol for a couple of days but it still does it. Dont know what module its from.
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| 11th Feb 2009 11:17 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Once the light comes back on, are all three codes present? The 'P' codes relate to the fuelling system running to rich, as you know - are all three codes present when you run on petrol?
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| 11th Feb 2009 11:24 pm |
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raftrey
Member Since: 29 Oct 2006
Location: wigan
Posts: 59
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The 'p' codes appear every time but the 'u' code has only appeared a couple of times.
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| 11th Feb 2009 11:35 pm |
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dark.soul999
Member Since: 10 Feb 2009
Location: below
Posts: 5
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Just ignore U code. Check air filter for restriction, leaks between MAF and intake or try to run on petrol.
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| 12th Feb 2009 12:03 pm |
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raftrey
Member Since: 29 Oct 2006
Location: wigan
Posts: 59
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Cleared the codes this afternoon, went to pick the kids up from school and on the way back the dreaded light came back on within about 5 miles. I haven't run on gas at all. Any ideas?
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| 12th Feb 2009 9:05 pm |
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dark.soul999
Member Since: 10 Feb 2009
Location: below
Posts: 5
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If engine running to rich then check air filter and leaks on air intake (most cases). Other possible cause is leaking injectors (but plausibility is low).
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| 13th Feb 2009 2:49 pm |
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