P1794

SYSTEM VOLTAGE MALFUNCTION - P1794
The TCM monitors the supply voltage and will log this fault if the voltage is less than 10.5 V when the engine speed is greater than 1600 rpm. This fault code is unlikely to be caused by a fault within the TCM and as such the vehicle harness and fuses etc. should be completely tested before the TCM is condemned.

Possible Causes:
Blown fuses.
Faulty harness wiring/connections.

Effects:
Transmission default settings adopted.
MIL illuminated.
Transmission warning lamp illuminated.
Maximum fluid pressure available.
Limp home mode applied.

Remedy:
Examine fuse F14 in LH heelboard fuse-box. Renew (if necessary) after determining cause of rupture.
Repair or renew harness/connector.