P1746 on Ford: How to Diagnose & Fix
Electronic Pressure Control (EPC) Solenoid — Open Circuit / Low Conditions
1 Ford model · 1 documented issue · 1 critical · $900-$3,000 repair
P1746 on Ford by model: symptoms, diagnosis and fix
The 5R55E five-speed automatic (behind the 4.0L before the 5R55W/S arrived for 2002) commonly loses reverse and/or slips in Drive/1st as the low/reverse sprag, reverse clutch pack, and forward clutch wear. A broken tab on the pressure-regulating (EPC) solenoid in the valve body drops line pressure, so reverse — which needs the most pressure — engages late or not at all, and the engine flares on deceleration. High-mileage owners often describe it simply as the truck 'won't back up.'
Common Symptoms
- No reverse or delayed/harsh reverse engagement
- Slipping or no movement in Drive/1st
- Engine flare/rev on deceleration
- Delayed forward engagement when cold
- Burnt-smelling or dark transmission fluid
How to Fix
Diagnose with a line-pressure test and pan inspection before condemning the unit. Common repairs are the low/reverse sprag, reverse/forward clutch packs, and valve-body/EPC solenoid rebuild; worn units warrant a full rebuild. Service fluid and filter regularly; low/burnt fluid accelerates clutch slip. Address any radiator internal-cooler contamination first, as coolant intrusion is a frequent root cause.
Sources for this issue (3)
P1746 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 P1746 mean on a Ford?
P1746 stands for "Electronic Pressure Control (EPC) Solenoid — Open Circuit / Low Conditions." This is a manufacturer-specific powertrain code and the meaning depends on the brand. On Ford (and Mazda vehicles using Ford transmissions) it means the powertrain control module commanded the electronic pressure control solenoid but saw an open/low condition in that circuit — the solenoid that regulates transmission line pressure is not responding correctly, which shows up as harsh or erratic shifts, slipping, or limp mode with maximum line pressure. On Volkswagen/Audi the same number (VAG 00532) is a transmission control module relay supply voltage (B+) malfunction, often from low battery voltage or a bad ground, so confirm which definition applies to your vehicle. On Ford it is documented across 1 model: Explorer.
What are the most common causes of P1746?
The most common causes of P1746 are: Failed electronic pressure control (EPC) solenoid, Open or shorted wiring in the EPC solenoid circuit, Corroded or damaged transmission case connector / internal harness, Low or contaminated transmission fluid, Faulty powertrain or transmission control module, On VW/Audi: failed TCM power supply relay, blown fuse, corroded contacts, weak battery or poor ground. The specific cause varies by vehicle.
How much does it cost to fix P1746 on a Ford?
Published repair estimates on Ford range from $900 to $3,000 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.