P1612

DTC P1612
Highside switch control cannot switch on or has S/C to ground.

Possible causes by suggested order of priority:
- C193/53 (OLG) shorted to C193/28 (B).
- C193/53 (OLG) shorted to vehicle earth.
- C193/30 (OP) shorted to C193/28 (B).
- C193/30 (OP) shorted to vehicle earth.
- C193/33 (OW) shorted to C193/28 (B).
- C193/33 (OW) shorted to vehicle earth.
- C193/32 (SO) shorted to C193/28 (B).
- C193/32 (SO) shorted to vehicle earth.
- ECU fault.

C193/53 (OLG) shorted to C193/28 (B).
- Check resistance < 5.0 Ohm

C193/53 (OLG) shorted to vehicle earth.
- Check resistance < 5.0 Ohm

C193/30 (OP) shorted to C193/28 (B).
- Check resistance < 5.0 Ohm

C193/30 (OP) shorted to vehicle earth.
- Check resistance < 5.0 Ohm

C193/33 (OW) shorted to C193/28 (B).
- Check resistance < 5.0 Ohm

C193/33 (OW) shorted to vehicle earth.
- Check resistance < 5.0 Ohm

C193/32 (SO) shorted to C193/28 (B).
- Check resistance < 5.0 Ohm

C193/32 (SO) shorted to vehicle earth.
- Check resistance < 5.0 Ohm

ECU fault.
CHECK THE FOLLOWING:
- Ensure all of the checks for short to vehicle earth have been carried out.
- If these problems are not present check transmission ECU by substitution with a known good unit.
POSSIBLE FAULTS
- Faulty transmission ECU.