Hi

This car has an intermittent fault
During driving the engine check light will come on, the car will judder slightly and go into limp. If you switch off the ign and try again, the car will drive OK but the EML will be on.

Stored diagnostic trouble codes:-
Engine
U0101 lost communication with TCM
ABS
No trouble codes
SRS
No trouble codes
Cluster
U2064 warning indicator requested by another module
U0101 lost communication with TCM
Generic module
No trouble codes
EPS
No trouble codes

This car had been at the dealers for about 3 weeks and they diagnosed the engine ECU. However, by this point the customer had lost faith and pulled the car out.

I checked out the CAN circuit on my Pico while wiggling the wiring and could not fault it. The customer decided to go for another PCM and I coded it in. Within 24 hours the same fault occurred.

Apart from pulling the dash apart again and using the Pico on the CAN circuit again I am not sure where to go from here. The engine and auto gearbox ecu are one unit. The codes indicate they are loosing comms with each other.

Has anyone else seen this.

Regards

Simon