Possible Cause

The following items may be area of concern:

• Related relay DTCs present.
• Intermittent wiring and connector problems.
• Transmission control relay output circuit open.
• Pressure switch inoperative.
• L-R pressure switch sense circuit open.
• L-R pressure switch sense circuit shorted to ground.
• L-R pressure switch sense circuit shorted to voltage.
• Faulty TCM.
• Loss of prime (DTC P1791) present.