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1998 Ford Expedition P1747 Code: Causes, Fixes, and Transmission Solenoid Explanation

Model: 1998 Expedition Fault Code: P1747 Posted: 2007-02-16 10:46

I'm experiencing a P1747 diagnostic code on my 1998 Ford Expedition. What does this code mean, and what steps should I take to fix it? P1747 is a transmission-related fault code that indicates a short circuit in the Electronic Pressure Control (EPC) solenoid. The EPC solenoid regulates line pressure within the transmission, and its feedback circuit in the Powertrain Control Module (PCM) monitors current flow. If the system detects a short to ground (low pressure), the PCM may reduce engine torque to protect the transmission from damage. This code is commonly found in 1998 Ford Expedition models with automatic transmissions. While it's often related to wiring or grounding issues, it can also stem from internal solenoid failure or faulty connectors. I've been advised that a full transmission service may include replacing the EPC solenoid as part of a major maintenance routine. I'm wondering if simply checking and cleaning ground connections will resolve this issue—or whether more extensive repairs are needed. Does changing the automatic transmission fluid (ATF) make any difference? My mechanic has recommended replacing the EPC solenoid during a full service, but I'd like to understand the root cause before proceeding. Additionally, I recently noticed two new codes: P0743 and P0750. Are these related to the same transmission issue as P1747? Or are they separate problems that may require different diagnostics? Thanks for any insights—especially from experienced users or mechanics!

Related fault codes
P1747
Comments (10)
Anonymous 2007-02-16 11:29

Yes, P1747 stands for 'Electronic Pressure Control Solenoid - Short Circuit'. This is a transmission-specific code that indicates an electrical short in the EPC solenoid circuit.

Anonymous 2007-02-16 11:41

The EPC solenoid controls line pressure in the automatic transmission. It has a feedback loop with the PCM to monitor current flow. A short to ground (low current) can trigger P1747, leading the PCM to reduce engine torque to prevent transmission damage.

Anonymous 2007-02-16 11:59

Confirmed—P1747 is a valid and recognized code for the Electronic Pressure Control solenoid short circuit in Ford Expedition models from that era.

Anonymous 2007-02-16 15:03

Correct, P1747 is indeed a transmission-related fault code. It affects the automatic transmission's pressure control system.

Anonymous 2007-02-25 15:09

I've seen this same P1747 code on my 2000 Ford Explorer. Anyone know what exactly it means, and are there common causes or fixes? I'm looking for practical solutions before taking the car to a shop.

Anonymous 2007-02-28 18:32

The EPC solenoid is critical in managing transmission line pressure. If it shows a short circuit (low current), the PCM will reduce engine torque to protect the transmission. This can lead to poor shifting or transmission damage if unresolved.

Anonymous 2007-03-01 12:55

Transmission-related codes like P1747 can be expensive to repair, especially if they require solenoid replacement or internal transmission work. Early diagnosis is key to avoiding costly repairs.

Anonymous 2007-03-01 13:35

Thanks for the clarification! I'm considering checking all wiring and ground connections first—especially at the EPC solenoid location. Will changing ATF help? My mechanic says it's part of a full service, but I want to know if that’s enough or if I need to replace the solenoid specifically. Also, I just got new codes: P0743 and P0750—could these be related to the same transmission issue?

Anonymous 2007-03-01 14:33

Hi again! After re-scanning, I now have P0743 (Transmission Control Solenoid A) and P0750 (Transmission Range Sensor Circuit). These may be secondary issues related to the same transmission system as P1747. While not directly identical, they could stem from similar root causes like faulty wiring or solenoid failure. I'm not a mechanic, but I appreciate the community's help in understanding these codes.

Anonymous 2007-03-02 08:18

For reliable diagnosis and repair, it's best to take your vehicle to a trusted transmission specialist or dealership—especially when dealing with complex solenoid and pressure control issues.