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Thread: Truck Won't Start - Batteries/Alternator Are Good

  1. Top Of Page | #21
    I WILL STAND! AK Bob's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by jgruberman View Post
    Well, so far, no starting issues, just the remaining CEL codes that I can't shake.

    Don't think they are related to the voltage, though.

    Sent from my SM-S908U using Tapatalk
    Okay, I am back home. See attached troubleshooting information on these codes, they are both related to an ABS module or Wheel sensor. It is likely that the P0501 wheel sensor code has set the U1412 implausible code due to a bad rear wheel speed sensor or could be a problem with the ABS module.

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    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  3. Top Of Page | #22
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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Like was mentioned, both batteries need to be replaced. Now you have a strong battery and the other not so strong. Your gonna end up back in the same situation you were in.


    2016 Ram Laramie 3500, G56, 6.7, CC, 4x4

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  5. Top Of Page | #23
    I WILL STAND! AK Bob's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by jgruberman View Post
    U1412 and P0501. I have an ABS light on, a service electronic throttle system, service trailer brake system, and four-wheel drive temporarily unavailable message... Oh, and no working speedometer

    Sent from my SM-S908U using Tapatalk
    All the above symptoms are tied to the ABS Module. Since you have had all the recent battery voltage issues you may have damaged the ABS module. First check for good power and ground at the ABS module. If that looks good compare both rear wheel sensors by back probing each sensor wire and measure the DC voltage to ground.

    Edit: Added attachment for identifying ABS Module powers and grounds.

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    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  7. Top Of Page | #24

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by AK Bob View Post
    All the above symptoms are tied to the ABS Module. Since you have had all the recent battery voltage issues you may have damaged the ABS module. First check for good power and ground at the ABS module. If that looks good compare both rear wheel sensors by back probing each sensor wire and measure the DC voltage to ground.

    Edit: Added attachment for identifying ABS Module powers and grounds.
    Where is the ABS module to test? I will also look for the rear wheel speed sensors. What is a "good voltage", 11-14?

    Sent from my SM-S908U using Tapatalk


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  9. Top Of Page | #25
    I WILL STAND! AK Bob's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by jgruberman View Post
    Where is the ABS module to test? I will also look for the rear wheel speed sensors. What is a "good voltage", 11-14?

    Sent from my SM-S908U using Tapatalk
    See attached information for location of ABS module and connector pin out. I can only provide screenshots as the Mopar software doesn’t allow for export. On the wheel sensors you will be looking for the same readings on each. The one that is different is bad. I believe you will see 5 VDC or less between each sensor wire and ground.

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    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  11. Top Of Page | #26
    Watch Dog! Corkey's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    With the sensor disconnected, connect the positive lead to the signal wire and the negative lead to the other side that is the ground for the ABS module. This voltage comes directly from the ABS module and will be between 1.5 and 5 volts. This is the bias voltage from the ABS module.

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  13. Top Of Page | #27

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by AK Bob View Post
    See attached information for location of ABS module and connector pin out. I can only provide screenshots as the Mopar software doesn’t allow for export. On the wheel sensors you will be looking for the same readings on each. The one that is different is bad. I believe you will see 5 VDC or less between each sensor wire and ground.
    Got it. I will check it out. I may consider starting with the speed sensors since it was very heavily wet the other day and this all started then. These are on the back of each wheel hub?


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  15. Top Of Page | #28
    Watch Dog! Corkey's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Wheel speed sensors are often called ABS sensors.
    You'll find them mounted on the axles of all ABS equipped vehicles.
    Look for this sensor
    on your wheel hubs, near the brake rotors.
    You'll find the rear wheel speed sensor mounted on the rear axle housing or wheel cylinder.


    Edit-


    @jgruberman

    II 60HP STICKS, II 33% CP3, II S464 2ND GEN SWAP, FASS 165 TITANIUM SIGNATURE SERIES, AFE INTAKE HORN, S&B FILTER, 5" TURBO BACK, ALPHAREX HEAD LIGHTS, 38X13.5X20 RAZOR M/T, MOTO METAL RIMS, 6" LA LIFT KIT, COMPLET MM3 KIT, BUILT TRANSMISSION, 6 BOLT REDHEAD STEERING BOX

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  17. Top Of Page | #29
    I WILL STAND! AK Bob's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by Corkey View Post
    With the sensor disconnected, connect the positive lead to the signal wire and the negative lead to the other side that is the ground for the ABS module. This voltage comes directly from the ABS module and will be between 1.5 and 5 volts. This is the bias voltage from the ABS module.
    Thanks @Corkey good information. I would still recommend not disconnecting the sensors but just back probe each sensor wire to ground. This way you will see the signal voltage and the voltage drop through the sensor for comparison. If you disconnect the sensor to take the measurements you will still need to Ohm out each sensor. You will need to have the key in the run position but engine can be off. Once again you will be looking for one sensor different from the others but double check your meter ground connections each time.

    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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  19. Top Of Page | #30
    I WILL STAND! AK Bob's Avatar

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    Re: Truck Won't Start - Batteries/Alternator Are Good

    Quote Originally Posted by jgruberman View Post
    Got it. I will check it out. I may consider starting with the speed sensors since it was very heavily wet the other day and this all started then. These are on the back of each wheel hub?
    Did a little research on Mitchell 1 tonight but the PDF files were too large to upload. They are recommending the use of a scan tool to troubleshoot the ABS system and show a list of Cxxxx-xx trouble codes to identify specific wheel sensors and other failures (see attached). So depending on how you make out with the sensor voltage checks tomorrow, this will be another option but will require a higher end scanner.

    Attached Files Attached Files
    2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, Cold Air Intake, City Diesel Actuator and 50 Gallon Aux Fuel Tank.

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