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So many codes, mechanic says it probably needs a new engine!?
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Thread: So many codes, mechanic says it probably needs a new engine!?

  1. #1
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    So many codes, mechanic says it probably needs a new engine!?

    The other night while driving home from work my check engine light came on and started flashing. My 2012 Abarth with 73,000 miles was struggling in low gear and misfiring. I took it to the nearest mechanic and they said there was oil fouling up one of the spark plugs, so they ran diagnostics and got (mechanic hand wrote these so there may be errors):
    • U173387 Lost communication with CTM
    • U001987 Car Misfiring, engine light flashing
    • TPMS U001987 LF Sensor internal failure
    • P106200 Cyl #2 Oil supply solenoid valve stuck
    • P106800 Oil supply valve switch off time range
    • C121773 Reverse gear switch stuck close
    • U171587 Yaw rate sensor missing


    So they changed the plugs, changed the oil and serviced the fuel system as a first step. That didn't do anything so they said it probably needs a new engine. I thanked them and picked up the car. Any thoughts or next steps?

    Thanks,
    James

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    Wow that's a lot of weirdly unrelated codes. Did they check the battery? A weak battery can throw these cars into fits.

    If it's not the battery I'd say you have some serious electrical issues, perhaps a nasty short in the loom, and possibly a failed PCM and BCM. Did you get struck by lightning?
    2013 500c Abarth - phase 3
    2012 500 Pop - daily
    2016 Range Rover Evoque - Wifey's

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    Quote Originally Posted by texanbrit View Post
    Wow that's a lot of weirdly unrelated codes. Did they check the battery? A weak battery can throw these cars into fits.

    If it's not the battery I'd say you have some serious electrical issues, perhaps a nasty short in the loom, and possibly a failed PCM and BCM. Did you get struck by lightning?
    Well the car was bought used with a clean carfax, but I was lightly rear ended and when I went to get the bumper fixed they found a lot of the front panels were shimmed. So, it had been in a previous accident and not fixed very well and codes like the reverse light issue I believe were related to that repair. It's more the oil fouling the spark plug and the misfire in the #2 cylinder that I am concerned with. I don't think that can be related to the battery.

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    P1062, P1068 and U1703-87 Codes

    First step is to make sure you have a stable electrical system without intermittent connections or voltage. That can throw a bunch of seemingly unrelated codes. Low voltage can also cause misfires. Once that is confirmed you have good voltage and connections you can move on.

    The big question that may be hard to answer is how the previous owner maintained the vehicle. Oil changes, proper oil and never running the car low on oil are vital to the longevity of the car. If you take the oil cap off and look down the filler tube to see if there is a lot of varnish or gunk in the engine. If there is, that is a good sign that maintenance was not kept up.

    The basics of oil pressure/compression/leak down tests will tell you the condition of the engine. Keep In mind, the multiair relies on oil to work, so pressure and quality means a lot. Dirty oil can cause misfires and eventually can damage the unit, and of course the other components of the engine. There is also an oil filter for the multiair that could get clogged.

    Typically what happens is besides not getting the oil changes done on time, people don't check the oil frequently enough and run the engine low on oil and that causes engine damage. This might not necessarily be immediately noticeable but show up down the road as the wear keeps increasing until something critical happens.

    Here is some info on some of the codes. The engine codes have a common theme based all around oil.

    The U1733-87 doesn't come up, but U1703-87 does and that is loss of communication with the IPC. It is set when the Bus messages not received from the Instrument Panel Cluster (IPC) for approximately two to five seconds. This can be caused by the following


    • CAN BUS CIRCUITS OPEN OR SHORTED
    • DTCS RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
    • INSTRUMENT PANEL CLUSTER (IPC) POWER AND GROUND
    • BCM NOT CONFIGURED CORRECTLY
    • INSTRUMENT PANEL CLUSTER (IPC)
    • MODULE THAT SET THIS DTC


    I did a quick search on the forum and came up with this from a previous thread for the P1062 code. Tag P1062 (p1061, P1062, P1063, P1064 are the same and just correspond to what cylinder the issue is occuring in).

    Quote Originally Posted by Fiat500USA View Post
    P1061: CYLINDER 1 OIL SUPPLY SOLENOID VALVE STUCK

    Theory of Operation
    MultiAir is an electronically controlled variable intake valve phase and lift system. Unlike conventional intake valve phase and lift system which controls all the cylinder intake valves simultaneously and in the same proportion; MultiAir, through the use of an electronically controlled “ hydraulic link” between the camshaft and intake valve, allow for each intake valve to be controlled independently. The valve lift and timing can be adjusted infinitely.


    The MultiAir valve train has a mechanical camshaft lobe acting on a hydraulic pump located between the camshaft intake lobe and the intake valve. The pump provides oil under pressure to a two-way electro-hydraulic solenoid valve called the Variable Valve Actuator (VVA) Solenoid. The VVA Solenoid is electronically controlled during the specific intake cam lobe event by the Powertrain Control Module (PCM). During the event the VVA Solenoid is commanded to either hold oil pressure or bleed oil. The Variable Valve Actuator (VVA) Solenoid is a normally open solenoid. The PCM provides 12 volts to close the solenoid. The position of the VVA Solenoid determines the intake valve timing and lift. This change on valve action is similar to creating a change in the camshaft lobe profile affecting lift and duration of the valve opening.

    When Monitored:
    This diagnostic runs continuously when the following conditions are met:

    The engine is running with no battery voltage or ASD Relay faults active.

    Set Conditions:
    The Powertrain Control Module (PCM) monitors the feedback current and determines that the VVA Solenoid is stuck.

    Default Actions:
    The MIL is illuminated on the first trip that the diagnostic fails.
    The MIL will be turned off on the third consecutive trip that the diagnostic passes.


    Possible Causes
    1. VVA SOLENOID

    2. CHECK THE ENGINE OIL

    NOTE: The actuators will not operate if the oil pressure is too low or too high.

    Check the engine for the following:

    • LOW ENGINE OIL
    • INCORRECT OIL FILTER THAT DOES NOT MEET OEM SPECIFICATIONS
    • OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
    • CORRECT VISCOSITY AND WEIGHT
    • ENGINE OIL CONTAMINATED (i.e., coolant and/or fuel)
    • Is oil level, type, condition, and filter correct?


    3. CHECK OIL PRESSURE / ENGINE MECHANICAL

    1. Remove the Oil Pressure Switch and install a mechanical oil pressure gauge.
    2. Crank the engine for at least 10 seconds and check the oil pressure at the Oil Pressure Switch location.
    3. Is the oil pressure between 0.8 bar (11.6 psi) and 7.5 bar (108.8 psi) ?



    Yes
    Replace the Variable Valve Actuator Assembly

    No
    Repair as necessary.



    courtesy of FCA


    Code P1068 - Cylinder 2 oil supply solenoid valve switch off time out of range.

    Possible causes

    • ENGINE OIL LEVEL LOW
    • ENGINE OIL AERATED OR CONTAMINATED
    • INCORRECT ENGINE OIL FILTER
    • INSUFFICIENT OIL PRESSURE DUE TO A MECHANICAL FAILURE IN THE OILING SYSTEM
    • VARIABLE VALVE ACTUATOR (VVA) ACTUATOR ASSEMBLY



    Another thread with theses codes: http://www.fiat500usaforum.com/showt...ctuator-mayhem


    Here is how to check the oil pressure:

    CHECK OIL PRESSURE / ENGINE MECHANICAL

    1. Remove the Oil Pressure Switch and install a mechanical oil pressure gauge.

    2. Crank the engine for at least 10 seconds and check the oil pressure at the Oil Pressure Switch location.


    Is the oil pressure between 0.8 bar (11.6 psi) and 7.5 bar (108.8 psi)?


    If it is, the Multiair Brick needs to be changed.

    If the pressure is low, the cause of the low pressure needs to be determined.

    That is likely a worn out engine.
    Last edited by Fiat500USA; 12-06-2018 at 09:05 AM. Reason: Fix some late night grammar ;)
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