Hi all, i got the code below as pending on my car this basically appeared overnight.

Drove the car the night before no issues no watning lights all good.

When i was going to start the car the next morning there was all sorts of errors and beeps when turning on the ignition.

 

I am not able to clear the error code that is pending and the car wont start.

 

Any tip to what i can do?

 

Things i have tried:

- Made sure the battery is fully charged

- Checked all fuses to see if there are any blown fuses

- tried removing fault codes but the one pending still remains

- Attached picture of a relay in the fusebox in engine bay is clicking after the car has been attempted to be started

This is what the dash looks like when turning on the ignition now.

31 minutes ago, Ki11997 said:

Any tip to what i can do?

 

Either buy VCDS or a higher level fault code reader that can communicate with the individual modules, read more than just generic OBDII codes from the main ECU (which your says it cannot communicate with) and can delete them. It will also allow you to run output tests and live data readings of any suspect actuators and sensors.

 

"Pending fault code" is a good enough indicator that the manufacturers are just copiers and have no clue, I don't believe there is such a thing as a "pending" fault code, they are either logged or deleted.

Edited 19 November, 20232 yr by J.R.

As it cant communicate with the PCM then its safe to say that the U0100 code has not been read from that module and so does not require resetting, it would be more correct to display "cannot communicate with ECM/PCM" than give a fault code which may well not be stored within the module.

 

It could be that VCDS cannot communicate either in which case you will have to do some old school faultfinding to re-establish the can bus communications between the ECU and the OBDII socket and most likely between all the other modules on the Can network.

I know you said you charged the battery overnight but your symptoms are typical of a battery that reduces its terminal voltage too far when cranking.

Try using jump leads to another car when starting just to rule out the battery.

1 minute ago, pikpilot said:

I know you said you charged the battery overnight but your symptoms are typical of a battery that reduces its terminal voltage too far when cranking.

Try using jump leads to another car when starting just to rule out the battery.

I have gotten a new battery actually to absolutely rule out the battery as the issue old battery was only 1 year old but did put out a really low voltage new one seems good when i got it tested.

2 hours ago, Ki11997 said:

Try using jump leads to another car when starting just to rule out the battery.

 

You can also rule out a poor earth connection if you connect the negative of the jump battery to the engine block or similar instead of the battery negative. 

Do the interior lights dim excessively when cranking?

all electronic like lights outside and inside the car and radio works fine also when cranking

29 minutes ago, pikpilot said:

 

You can also rule out a poor earth connection if you connect the negative of the jump battery to the engine block or similar instead of the battery negative. 

Do the interior lights dim excessively when cranking?