P0603

TCM FAULTS - P0603/P0605/P1608
Internal Control Module Keep Alive Memory Error - P0603
Internal Control Module ROM Test Error - P0605
Watch-dog Fault - P1608

Possible Causes:
Internal TCM circuit faults

Effects:
MIL illuminated.
Transmission warning lamp illuminated (P0605 and P01608 only).
Maximum fluid pressure available (P0605 and P1608 only).
Limp home mode applied (P0605 and P1608 only).

Remedy: Renew TCM.