Fault code ecm-c301

[rdltd]

Hello all, i have a 2005 volvo v50 2.0d showing fault code ecm-c301, cannot find any info on this, is it a main dealer code? appreciate some help. cheers

[Agtrak100]

Hi Possibly missfire cyl No1
as generic 0300 is random misfire.. and then the cylinders are 301 / 302 / 303 etc' there after.... possibly

[Rufe]

To cut a very long story short, it sounds like a software issue, which will mean a visit to a dealer (or a capable independent with the correct equipment) to get this sorted out.

Here's the long version of the same story....

Only now I have seen this. I know this was posted a couple of weeks back, so you may have sorted this out by now, but in case not, or in case it helps any one who finds this in the future, here is the official result for this code. It may be much more info than you need, but will help you get an idea of what this code means.

ECM-C301

*** "Internal Control Module Software Incompatibility, D4204T" ***

Condition:

The control modules communicate with each other for exchange of information in a network via a standardised serial communication procedure - CAN (Controller Area Network). The Central electronic module (CEM) regularly transmits messages on the CAN network. These messages contain information about which signal configuration ID applies to the vehicle. The control modules on the CAN network have the same signal configuration ID so that they can communicate with each other.
The control module compares its configuration ID with the signal configuration transmitted on the control area network (CAN) by the central electronic module (CEM).
The diagnostic trouble code (DTC) is stored if the control module detects that:

* The control module's configuration ID differ from the ID that the Central electronic module (CEM) transmits.

The control module's test for the diagnostic trouble code (DTC) starts in the event of:

* Ignition switch position II.
* Starting the control module's CAN communication.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.


Substitute Value:

* Control module shuts itself off ("bus-off").

Note! When the diagnostic trouble code (DTC) is stored, the control module responds to the diagnostic commands.


Possible Source:

* Incorrect configuration ID (the control module is not intended for this vehicle, for example it is a used control module with different software/hardware).

* Open-circuit in the CAN cables between the control module and the Central Electronic Module (CEM).


Fault symptom[s]:

* None

-------------------------------------------

*** "Faulty Configuration" ***

General information:
The diagnostic trouble code (DTC) is stored when the communication between the central electronic module (CEM) and the relevant control module has been interrupted. There can be a number of causes for interruptions in the communication:

* Faulty signal configuration in the control module that stored the diagnostic trouble code (DTC). The fault can be due to a customer or workshop replacing a control module without downloading new software for the replacement

* Intermittent open-circuit in one or both CAN cables in part of the network

* Intermittent short-circuits between the CAN cables

* Intermittent short-circuits between one of the CAN cables and ground or supply voltage

* Internal fault in the control module that stored the diagnostic trouble code (DTC).

The fault can also be due to faulty software in a control module, a hardware problem in the CAN network (faulty cables) or a fault in a control module.

Note! If there is a diagnostic trouble code (DTC) for a communication fault in a control module, check whether diagnostic trouble codes (DTCs) have been stored in the central electronic module (CEM). The central electronic module (CEM) monitors the voltage level in the CAN cables and is the only control module that can directly store a diagnostic trouble code (DTC) for a short-circuit in one of the cables for ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a CAN fault unless fault-tracing has indicated that the central electronic module (CEM) has an internal fault.[/B]

Corrective Actions:
1. If this diagnostic trouble code (DTC) is the only communication diagnostic trouble code (DTC) stored in one of the control modules in the high speed network, try to remedy the fault by downloading new software for the control module that stored the diagnostic trouble code (DTC)

2. Check the cables in the CAN network according to the following fault-tracing

3. The control module should be replaced as a last resort.


Other Information:
To download software to the relevant control module, see Replacement parts catalogue/Software index or the Software manager.

[rdltd]

Thanks rufe for the reply & for the detailed information you have posted, the symptoms the car is having is a misfire, to date we have had the injectors tested (Siemens) a basic test shows there are no leaks & the spray pattern is ok, a compression test has been done which is good.

It has now been pushed to one side, ecm c301 is the only dtc (stored under engine ecu) we use launch x431 however i am not 100% sure that it could cause the car to run rough & misfire?

It has been plugged into a main dealer computer, a fault was present but no code was given!

It certainly will be good to eliminate this ecm c301 fault before we go to deep, appreciate your advise.

Cheers