Tach/Auxillary Cluster was faulty.. intermittently disrupting CAN communication for all modules connected.

Symptoms:
First the tach/auxillary cluster on the steering column would appear to turn off while driving, or when sitting parked.. But the backlighting would still work. Didn't have the time to fix it so I let it do it's thing while I ignored it. Then a few weeks later I was driving and started having a whole new batch of symptoms --> ABS light, Check Eng Light, Tire Pressure Light, Eng Temp gauge fluctuating to max, A/C compressor disengage, Cruise disengage, Tach fluctuation, Speedometer needle fluctuation.

Scanned faults:
DME
P1613- Serial Communication with ASC
P1607- CAN status
ABS/ASC/DSC
5E14- CAN: Connection with Engine ECU Failed
5E16- CAN Instrumentation
5E1E- Steering Angle Sensor CAN
5E18- CAN: Data Error from Engine ECU
5E11- CAN: Control Module
INSTRUMENT PANEL (KOMBI)
60- CAN Bus, Bus Offline
61- CAN: No Signal
67- CAN: Timeout KOMBI
62- CAN: ABS/ASC Signal


While car was acting up, left the scanner connected and disconnected the tach/auxillary cluster. All the current CAN codes left, and the car functioned like it should. Reconnect the tach, and the CAN issues come right back. I'm driving tach-less right now with no issues.

Note: Other modules connected to CAN can cause similar problems..

Update: 10/28/19. Used replacement tach was installed shortly after the original post and is still working nicely.

 

Did you ever get a new tach or just go tachless??

 

Replaced with a used one and it's been good ever since. So.. approximately 4 yrs ago now

 

Good morning,

Stumbled on your thread, I have the same issues. Was the tach just a swap and go? Any programming needed?
Thanks

 

Yes sir, just a swap and go thankfully

 

Thanks! I did swap it and all the codes were gone except the steering angle one. I reset the sensor and so far so good!
Thanks again for the info, who would have thought the tach was the culprit!