No communication intermitent with P0606 DTC.

Hi, Thanks for allowing me in this Forum! My car is a 2.0 Diesel Chevrolet Captiva 2010, has a DTC P0606 and speedsensor problem. No start, sometimes it cranks when not in limp mode. I already check the ECU for ref voltage got it in may MAF sensor. Now the car has no comm when I put the scanner. I already check the DLC using a voltmeter, it has power in pin 16. I also use this in checking Hi and Lo CAN with 127 ohms - connector out and 65 ohms - connector in. Almost a year now having this problem. I learn some trouble shooting when I stumble on scannerdanner youtube videos, its been a great help really. I also got diagram and troubleshooting procedure from Autocats website and tried to follow them. Is this a sign that my ECU is broken even though I have 5 volts ref? I'm hoping its not the ECU. If there is a short from my 5 volt ref will it take down my ECU? Hoping for answers.. Thanks

P0606 is an internal PCM processor fault, The only thing you can do is check for good power and ground to the PCM.

Is this a sign that my ECU is broken even though I have 5 volts ref?

Yes.

Thank you Chad. I'll try this. About the speed sensor DTC, will it cause a short circuit in my ECU if I don't correct it?

Riffson17 wrote: About the speed sensor DTC, will it cause a short circuit in my ECU if I don't correct it?

I would say that it would be unlikely for the ECU to be damaged by a shorted Wheel Speed Sensor. However, this is just my opinion, and I can not guaranty it.

Have you checked your ecu connectors and pins that they are not corroded.
I have seen this code in other vehicles and once there was just barely visible corrosion at 1 of the ecu:s pins and this was throwing this code.
Also make sure that you have good grounds and feeds to ecu.
Also I know that in one Toyota there was a short to ground at brake light bulb, and when this was fixed, the P0606 was gone. However, I believe this applies only for some Toyota models. But You are saying that you have shorted wheel speed sensor, so I think you should check and fix that first, just to rule that out.

Since you still have the 5V reference voltage the PCU is not completely dead. Do you have access to a wiring diagram? If you can unplug each module you may find one that is bad and shutting down the can bus communication lines. Since you have a wheel sensor issue, you might start with the TCM and unplug that first and see if you can get the no-com issue repaired. If no joy there you can start to unplug each module in hopes of finding one that is bringing down the com network. Good luck to you.

I meant to say check/unplug the ABS module, not the TCM