P1728 — Ford — Transmission Slip Error

Transmission Slip Error. Source catalogue definition; confirm applicability using vehicle service information.

Affected system: Powertrain

Symptoms

• Transmission slipping during gear changes
• Noticeable delay in gear engagement
• Erratic shifting patterns
• Illuminated transmission warning light
• Reduced vehicle power and acceleration

Possible causes

• Low or contaminated transmission fluid
• Worn internal transmission clutches or bands
• Faulty torque converter lock-up solenoid
• Damaged or corroded transmission wiring harness
• Internal transmission hydraulic pressure loss
• Malfunctioning Transmission Control Module (TCM)

What to check

• Inspect the transmission fluid level and condition for signs of burning
• Scan for additional transmission-related diagnostic trouble codes
• Check the wiring harness and connectors for continuity and corrosion
• Perform a stall speed test to verify torque converter operation
• Test the transmission solenoid operation using a diagnostic scan tool
• Verify the output signals from the Transmission Control Module