P1744 on Ford: How to Diagnose & Fix
Torque Converter Clutch System Performance
3 Ford models · 3 documented issues · 3 critical · $25-$3,500 repair
P1744 on Ford by model: symptoms, diagnosis and fix
The Ford A4LD 4-speed automatic transmission used in early Aerostars (and the 4R44E/4R55E in 1995-1996 and the 5R55E on the 1997 4.0L) is known as one of Ford's weakest automatic transmissions. The overdrive band and servo fail prematurely, causing loss of overdrive. The forward clutch pack also wears rapidly, causing no-drive conditions. The valve body develops wear in the separator plate, causing erratic shifting. The transmission was originally designed for the lighter Ranger and is marginal for the heavier Aerostar, especially the AWD version.
Common Symptoms
- No overdrive gear — engine revs high on highway
- Delayed or flared 2-3 upshift
- Transmission slipping under load or on hills
- Harsh engagement when shifting from Park to Drive
- Check engine light with TCC-related codes
How to Fix
A complete transmission rebuild with upgraded friction materials, a wider overdrive band, and a TransGo SK-A4LD shift kit is the recommended fix. The shift kit improves clutch apply pressure and corrects valve body issues. For AWD models, consider upgrading to a remanufactured 4R55E with hardened input shaft. Regular fluid changes every 30,000 miles with Mercon V dramatically extends A4LD life.
Sources for this issue (2)
The 4-speed automatics behind the 4.0L - the early A4LD and the later electronically controlled 4R55E - are a known weak point, commonly failing in the 120k-mile range, most often losing 4th gear (overdrive). The overdrive planetary is fragile (early units used a weaker pinion design, later updated to a 6-pinion gear), and a failing vacuum modulator on the A4LD can quietly cook the overdrive section. When the overdrive sprag or drum lets go, debris circulates and a full rebuild is required. A closely related driveline failure is the powdered-metal spacer between the crankshaft and flexplate: Ford's sintered spacer is brittle and cracks, causing a rattle, vibration, and eventually hard-start/no-start or driveline separation.
Common Symptoms
- No 4th gear / no overdrive engagement
- Slipping or flaring shifts
- Delayed or harsh engagement
- Rattle at idle in gear (cracked flexplate spacer)
- Burnt-smelling transmission fluid
- Vibration or hard-start/no-start (spacer failure)
How to Fix
Service the fluid and filter on a strict interval and add an auxiliary cooler if towing. Replace a suspect A4LD vacuum modulator early (inexpensive ~$25 external part). Lost overdrive or slipping generally requires a rebuild or replacement transmission with updated overdrive components. When the transmission or flexplate is out, replace the brittle OEM powdered-metal crank-to-flexplate spacer with a billet-steel upgrade (e.g., Sonnax) to prevent recurrence.
Sources for this issue (2)
P0741 indicates the PCM has detected a torque converter clutch performance fault. Ford TSB 19-2100 (April 2019) states that some 2013–2015 Escape vehicles with the 1.6L EcoBoost engine may show an illuminated MIL and/or a transmission malfunction service now warning with only P0741 and/or P1744 stored, and that this may be due to internal damage to the torque converter. The bulletin applies only when all of those criteria are met; other engines, years or additional codes need their own diagnosis.
Common Symptoms
- Check engine light (MIL) on
- Transmission malfunction / service now warning
- Only DTCs P0741 and/or P1744 stored
How to Fix
For a confirmed 2013-2015 Escape 1.6L with only P0741 and/or P1744, follow Ford 19-2100 or current guidance. The repair replaces the torque converter and filter, inspects the pump, and inspects the main control valve body and solenoid body, replacing them where the bulletin calls for it. Other engines, years or additional codes require their own diagnostic path; fluid appearance alone does not establish this repair.
Sources for this issue (1)
P1744 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P1744 mean on a Ford?
P1744 stands for "Torque Converter Clutch System Performance." This transmission code means the torque converter clutch (TCC) system is not performing as expected — the lockup clutch inside the torque converter is slipping or not engaging and disengaging properly. The TCC mechanically links the engine to the transmission at cruising speeds to improve efficiency, and the computer monitors slip between engine and transmission speeds to verify it. Excess slip or improper engagement sets this code. You may feel shuddering, RPM that won't settle at cruise, or reduced fuel economy. On Ford it is documented across 3 models: Aerostar, Explorer, Escape.
What are the most common causes of P1744?
The most common causes of P1744 are: Worn or failing torque converter / lockup clutch, Faulty TCC solenoid, Low or degraded/contaminated transmission fluid, Dirty valve body or stuck valve affecting TCC apply, Damaged TCC solenoid wiring or connector, Internal transmission wear causing excess slip, Faulty transmission control module (less common). The specific cause varies by vehicle.
How much does it cost to fix P1744 on a Ford?
Published repair estimates on Ford range from $25 to $3,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.