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  1. #11
    Bobtail Member
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    Pablo EECU is located on driver side engine and only have one plug right?


  2. #12
    Bobtail Member
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    Well i fallow those 2 wires from coolant level sensor and one wire went to Y and spilt to EECU and it was goid but one that went to back of engine was broken when Volvo shop fixed other wire/s
    Now is all good without codes

    Thanks Pablo and rest of you guys

  3. #13
    Road Train Member Pablo-UA's Avatar
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    Lugansk, UA
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    wiring problems are common for Volvo, MAN, Iveco and DAF XF.

    But after 2007 I see the same problems with MACK and Renault trucks.... yep, Volvo group

    Early Volvo F, FH and WG before 1998 were bullet proof, especially F12 and WG with 123 engine. D12A was good too.

    But in 1998 newer VN and FH of '98 version and later Version-2 are too complicated. So wiring problem appeare!

  4. #14
    Bobtail Member Shangrilah7's Avatar
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    Jul 2013
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    Hempstead, NY
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    I have the same truck and was having the same problem for several months. Been to the Dealer several times,
    but they couldn't seem to find the problem. Well, I found the problem with mine. The ECU (mounted by the
    engine block) has a wire harness that aging wires separate or fray at the harness causing erratic connections.
    My gauges would go crazy, the truck would stall, I get multiple error codes, and is hard to start.
    This is simply because the ECU is not receiving the data from various sensors continuously. The ECU monitoring
    circuits do just that, monitor all inputs from sensors. If after a short period of time, any particular sensor fails
    or stops giving data, then the ECU will attempt to compensate (LIMP MODE), register error codes, and the truck
    may fail all together. Check the wire harness at the ECU for broken or frayed wires. Also check all ground to chassis
    locations. I have found this to be a common problem in these trucks. I have seen this in more than 20 trucks
    in the last month alone. Many shops wont touch it because they may not have the diagnostic equipment to connect
    to a Volvo. Volvo's are sensitive. The truck will continue to run so long as basic parameters can be maintained,
    but as soon as voltages vary too much, or fuel pressures are inconsistent, or DATA received is too erratic, then the
    ECU will shut down the truck, for safety. It will drive a mechanic crazy and cost the truck owner many dollars.
    If the truck is old or high mileage, it is not uncommon for wires to begin fraying. This happens naturally and mostly
    due to extreme normal temps under the hood.
    It is good practice on older or high mileage trucks to check your wire harnesses and plugs for cracks, burns or frays.
    Not just in a Volvo. The Volvo 600 and 700 series trucks suffer from old dry cracked and frayed wires.
    I am actually making a partial new harness to the ECU on my truck right now. Did this for a friend several weeks ago.
    It fixed all of his Phantom error codes and he is hauling steady without problems. Go hand over hand through the
    harness and check all wires and connectors. This is time consuming, but can save thousands of dollars in guess-work
    repairs. Hope this helps.

  5. #15
    Bobtail Member
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    Pablo new/old problem is back

    Everything started this morning after i woke up. Last night truck was idling for about 6 hrs. This morning i notice truck bob tail ABS light was on and engine/brake/vehicle ecu flash a few time but goes away. Than after 100 miles start flashing even more and start derating power. I lost crouse control, speedometar and turbo gauge stoo working too.
    Here is codes i got
    Engine ECU
    Vehicle speed data erratic MID128 PID84 FMI2
    SAE J1939 data link communication error MID128 SID231 FMI9

    Brake ECU
    SAE J1939 Electrical fault/data link communication error MID136 SID231 FMI9

    Info Display
    SAE J1939 MID140 SID231 FMI2

    Vehicle ECU
    SAE J1939 data link Data erratic MID144 SID231 FMI2

    Light CM
    MID216 PSID200 FMI9

    I can idle but there is no power to drive it

  6. #16
    Bobtail Member
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    Well green wire was broke. Easy fix but since i was in shop i let then to adjust clutch and i found clutch was about to go south and central xarrier bearing on driveshaft was bad. $2200 went out my pocket darn it

  7. #17
    Bobtail Member
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    I have a 2007 vnl Volvo I get error message on screen data link broken took it to Volvo in nj they couldn't find the problem so they said for 6 months the dash acted normal.. now that were getting bad weather its starting to act up again I have taken apart the dash and looked at the fire wall pass thru area and at the ecm don't see any breaks in the wire where else can I go to look to see where there might be a break.. I spent 1300 they told me 5000.00 to rewire cab which I find just down right stupid does anyone know any good electrical shops in central nj and please don't tell me a dealer there idiots.. and are only after the 115.00 a hour labor rate and will milk you dry... only the left side of my dash goes out...

  8. #18
    Bobtail Member
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    Quote Originally Posted by Slow302 View Post
    Well green wire was broke. Easy fix but since i was in shop i let then to adjust clutch and i found clutch was about to go south and central xarrier bearing on driveshaft was bad. $2200 went out my pocket darn it
    Hi Slow, Im experiencing a similar problem when I wash the truck, my tractor abs lights up and then my keypad wont allow me to shift out of neutral. Where is the green wire? Im trying to figure out where my wiring problem is, thanks.

  9. #19
    Light Load Member
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    Oct 2009
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    vernon hills,Il
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    I've had same problem. In rain or after wash the dash would act up. Never drivability problems. The consensus opinion on this forum was that water was getting to connections on pass thru. Before last truck wash I've got 2 plastic bags, and wrapped them around those bundles of wires. No problem after wash, and no problem in several downpours.

  10. #20
    Bobtail Member
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    Feb 2014
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    Thanks for your input. Is that on the driver side firewall?

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