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Mercedes Actros MP4 Euro 6 - ACM, code 970C07, another - 900C0B

Cobra1609 38703 14
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  • #1 18950372
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Hello! I have a problem with ACM, namely the code 970C07 was first lit - the sensor readiness conditions before the angle were not ensured in a timely manner. The sensor in front of the catalyst was replaced with a new one and two weeks after the dpf filter burned out, another code 900C0B appeared, i.e. the signal value of A70 b1 (sensor at the catalyst inlet) is incorrect. After deleting the xenta of the fault, everything is ok until dpf is fired again and the situation repeats itself. Does anyone have any idea what to do to remove this problem?
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  • #2 18950918
    Gerri
    Mercedes specialist  
    Posts: 5662
    Help: 853
    Rate: 3596
    The second error is a corresponding dynamic test in the original diagnostic computer. And that's where I would start. I introduced some random data for this model to the simulation of the test on Star Diagnose, because of course the data of the damaged car is missing and it is not known what its completion is.
  • #3 18951621
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    So you can not do without the service because you have to log in to the Mercedes system?
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  • #4 18951628
    Gerri
    Mercedes specialist  
    Posts: 5662
    Help: 853
    Rate: 3596
    The test itself should fly even on an SD clone. Without logging into the network.
  • #5 18951634
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Yes, I know, but it shows me that I must have some external data carrier

    Added after 1 [hours] 24 [minutes]:

    Geri, what part of Poland do you live in?
  • #6 18951866
    Gerri
    Mercedes specialist  
    Posts: 5662
    Help: 853
    Rate: 3596
    Cobra1609 wrote:
    Yes, I know, but it shows me that I must have some external data carrier

    Such a message is actually displayed when there is no on-line contact. Instead of real-time data transfer, a file is sent to the Mercedes, which is processed in their cell and sent back. This happens in different cases and I do not necessarily associate it with the current inquiry. It happens that some errors affecting the ecology require this procedure in order to be cleared. The manufacturer simply wants to know which customer and which car are operated in a way that pollutes the environment. If you have the option, throw in a screen or something else that may help to decode why the system wants you to prepare a data carrier.
    Cobra1609 wrote:
    Geri, what part of Poland do you live in?

    This part of Poland, inhabited by many Poles, is located almost 3,000 km west of Warsaw. When you have it on the way, please :)
  • #7 18951923
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    The first screen made with a simulator, but in fact during the diagnosis the same thing comes out
    Attachments:
    • Mercedes Actros MP4 Euro 6 - ACM, code 970C07, another - 900C0B IMG_20200930_193719.jpg (5.62 MB) You must be logged in to download this attachment.
  • #8 18951929
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Gerri wrote:
    Cobra1609 wrote:
    Yes, I know, but it shows me that I must have some external data carrier

    Such a message is actually displayed when there is no on-line contact. Instead of real-time data transfer, a file is sent to the Mercedes, which is processed in their cell and sent back. This happens in different cases and I do not necessarily associate it with the current inquiry. It happens that some errors affecting the ecology require this procedure in order to be cleared. The manufacturer simply wants to know which customer and which car are operated in a way that pollutes the environment. If you have the option, throw in a screen or something else that may help to decode why the system wants you to prepare a data carrier.
    Cobra1609 wrote:
    Geri, in what part of Poland do you live?

    This part of Poland, inhabited by many Poles, is located almost 3,000 km west of Warsaw. If you have one on the way, please :)
    Attachments:
    • Mercedes Actros MP4 Euro 6 - ACM, code 970C07, another - 900C0B IMG_20200930_193739.jpg (5.03 MB) You must be logged in to download this attachment.
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  • #9 18951930
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Gerri wrote:
    Cobra1609 wrote:
    Yes, I know, but it shows me that I must have some external data carrier

    Such a message is actually displayed in the absence of on-line contact. Instead of real-time data transfer, a file is sent to the Mercedes, which is processed in their cell and sent back. This happens in different cases and I do not necessarily associate it with the current inquiry. It happens that some errors affecting the ecology require such a procedure in order to be cleared. Simply put, the manufacturer wants to know which customer and which car are operated in a way that pollutes the environment. If you have the option, throw in a screen or something else that may help to decode why the system wants you to prepare a data carrier.
    Cobra1609 wrote:
    Geri, what part of Poland do you live in?

    This part of Poland, inhabited by many Poles, is located almost 3,000 km west of Warsaw. If you will have it on the way, I invite you :)
    Attachments:
    • Mercedes Actros MP4 Euro 6 - ACM, code 970C07, another - 900C0B IMG_20200930_194140.jpg (4.23 MB) You must be logged in to download this attachment.
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  • #10 18951951
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Gerri wrote:
    Cobra1609 wrote:
    Yes, I know, but it shows me that I must have some external data carrier

    Such a message is actually displayed when there is no on-line contact. Instead of real-time data transfer, a file is sent to the Mercedes, which is processed in their cell and sent back. This happens in different cases and I do not necessarily associate it with the current inquiry. It happens that some errors affecting the ecology require this procedure in order to be cleared. The manufacturer simply wants to know which customer and which car are operated in a way that pollutes the environment. If you have the option, throw in a screen or something else that may help to decode why the system wants you to prepare a data carrier.
    Cobra1609 wrote:
    Geri, in what part of Poland do you live?

    This part of Poland, inhabited by many Poles, is located almost 3,000 km west of Warsaw. If you have one on the way, please :)


    I am driving Belgium the Netherlands too far and back it is actually 3,000 is far ?
  • #11 18952130
    Gerri
    Mercedes specialist  
    Posts: 5662
    Help: 853
    Rate: 3596
    Well, that's more or less a matter of course. The system concluded that in order to repair the damage and reduce the possibility of its recurrence in the future, a software update in the controller was needed. In the case of an authorized service (and on-line contact), this type of process is automatic. If you cannot log into your personal account in the Mercedes database, you are probably in de - because the clones of the original service computer do not have access to program updates available as "patches" to fix the most common errors. I am also not able to remotely check if the software in the driver of your car is up-to-date.
  • #12 18952699
    Cobra1609
    Level 5  
    Posts: 8
    Rate: 10
    Well, nothing remains, the service, but thank you for your help and sincere greetings
  • #13 18953768
    Gerri
    Mercedes specialist  
    Posts: 5662
    Help: 853
    Rate: 3596
    Maybe try to run the test yourself - if you succeed, you will know where you stand. Then, possibly, you will go to the software update to the Dealership.
  • #14 19847087
    atego.l
    Level 2  
    Posts: 4
    Rate: 16
    Hello.
    Buddy, tell me when you got over the 900C0B error, I have the same, I have already changed two NOXs. The error can be deleted, but after firing the DPF, the same thing again, and nibbled on non-stop burns. Doalsnie "cosmos"

    Added after 3 [minutes]:

    Hello.
    Buddy, tell me when you got over the 900C0B error, I have the same, I have already changed two NOXs. The error can be deleted, but after firing DPF the same again, and nibbled non-stop burns burning "cosmos"
  • #15 21793873
    CarterTheBest
    Level 12  
    Posts: 25
    Rate: 18
    Simple - installation fault - most likely the harness right at the large ACM plug under the plastic cover/bushing.
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Topic summary

✨ The discussion revolves around issues with the Mercedes Actros MP4 Euro 6 related to ACM error codes 970C07 and 900C0B. The user reports that after replacing the sensor in front of the catalyst, the DPF filter burned out, leading to the reappearance of the 900C0B error, indicating an incorrect signal from the A70 b1 sensor. Responses suggest conducting a dynamic test using the original diagnostic computer or a compatible SD clone, as well as the necessity of logging into the Mercedes system for software updates to resolve recurring errors. The conversation highlights the importance of proper diagnostics and potential service intervention for persistent issues.
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FAQ

TL;DR: For Actros MP4 Euro 6 ACM fault loops, start with 1 controller software check/update; "a software update in the controller was needed." Authorized online service applies patches automatically; clone SD tools lack update access. Clear faults after updating and validate regeneration. [Elektroda, Gerri, post #18952130]

Why it matters: This FAQ helps Actros MP4 Euro 6 owners and techs fix recurring ACM codes tied to DPF events.

Quick Facts

What do ACM codes 970C07 and 900C0B mean on an Actros MP4 Euro 6?

970C07 flags that sensor readiness conditions were not ensured in time. 900C0B reports an incorrect A70 b1 signal at the catalyst inlet. In one case, faults cleared, then returned when DPF regeneration fired again. Replacing the pre-catalyst sensor alone did not end the cycle. Plan OEM-guided diagnosis next. [Elektroda, Cobra1609, post #18950372]

How do I start diagnosing 900C0B?

Start with the dynamic test in the original Star Diagnose. It correlates sensor values under load. "And that's where I would start." Confirm conditions, then assess A70 b1 signal plausibility. Complete the test before replacing parts. [Elektroda, Gerri, post #18950918]

Can I run the Star Diagnose dynamic test without logging in?

Yes. "The test itself should fly even on an SD clone." You do not need network login to execute the dynamic test. Use a stable power supply and follow on-screen conditions. This only runs the test; it does not apply software updates. [Elektroda, Gerri, post #18951628]

Why is Star Diagnose asking for an “external data carrier”?

That prompt appears when there is no online connection. The tool prepares a data file for Mercedes to process and return. Some emissions faults require this procedure to clear. The manufacturer tracks vehicles that might pollute due to faults. Prepare the file or connect online to continue. [Elektroda, Gerri, post #18951866]

Do I need a dealer visit for a controller software update?

Often yes. The system may require a software update to repair the fault. With online authorized service, the process is automatic. Independent tools cannot access those patches. Schedule the update if diagnostics point to software. [Elektroda, Gerri, post #18952130]

Will a clone SD tool apply ACM “patches” or updates?

No. Clones of the original service computer do not have access to program updates provided as patches. They can run tests, read codes, and guide diagnosis. Use them to confirm faults, then plan an authorized update if required. [Elektroda, Gerri, post #18952130]

My 900C0B returns after each DPF regeneration and fuel use is excessive—what does that suggest?

Users report this loop even after replacing multiple NOx sensors. One case used two NOx sensors, yet 900C0B persisted. Regeneration ran continuously, and fuel consumption spiked. This points beyond a failed sensor. Document the pattern and continue structured diagnostics. [Elektroda, atego.l, post #19847087]

I replaced the upstream sensor, but the fault returned two weeks later—what next?

One report saw 900C0B return about two weeks after replacement. The pre-catalyst sensor was new, yet faults reappeared on regeneration. That suggests the root cause remained unresolved. Proceed with deeper diagnosis and verify upstream signals. [Elektroda, Cobra1609, post #18950372]

Is an online connection sometimes required to clear emissions faults?

Yes. Some ecology-related errors need the data file procedure or live online contact to clear. The system enforces this to manage environmental compliance. Offline, you will see the data carrier prompt. Prepare and submit the file to continue. [Elektroda, Gerri, post #18951866]

Can you remotely verify if my ACM software is current?

No. Remote helpers cannot check your controller’s software version status from afar. Without database access, no one can confirm update currency. Only an authorized session can verify and apply patches automatically. Ask the dealer to check your VIN against available updates. [Elektroda, Gerri, post #18952130]

How do I run the Star Diagnose dynamic test for ACM?

  1. Open Star Diagnose, select the vehicle, and enter ACM.
  2. Choose the dynamic test for the active fault and follow prompts.
  3. Save results, clear codes, road test, then recheck. "The second error is a corresponding dynamic test in the original diagnostic computer." [Elektroda, Gerri, post #18950918]

Should I try the test first or go straight to the dealership?

Run the dynamic test yourself first. If it passes and indicates software, plan a dealer update. "Then, possibly, you will go to the software update to the Dealership." That sequence confirms the root cause before parts replacement. [Elektroda, Gerri, post #18953768]
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