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Home / DTC / P1746 — Electronic Pressure Control Solenoid A Open Circuit

P1746 — Electronic Pressure Control Solenoid A Open Circuit

Detailed page for trouble code P1746.

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P1746

LINCOLN P — Powertrain

Electronic Pressure Control Solenoid A Open Circuit

Brand: LINCOLN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken solenoid coil (internal break)
  • Open circuit in wiring harness (broken wire, pinched/chafed harness)
  • Loose, corroded or disconnected connector at solenoid
  • Failed solenoid connector terminal or pin
  • Faulty TCM/PCM driver output (open transistor)
  • Blown fuse or poor ground related to transmission control circuits

Symptoms

  • Transmission may enter limp/limited shift mode
  • Harsh, delayed or erratic shifting
  • Inability to regulate line pressure leading to transmission performance issues
  • MIL/Check Engine light illuminated with P1746 stored
  • Possible transmission slippage or poor acceleration

What to check

  • Read and record stored codes and freeze frame data with a capable scan tool (TCM data)
  • Visual inspection of wiring and connectors at EPC Solenoid A and along the harness to the TCM for damage, corrosion, or loose pins
  • Inspect transmission and engine grounds and relevant fuses
  • Measure solenoid coil resistance with harness disconnected and compare to manufacturer spec
  • Back-probe the solenoid connector and observe commanded signal while commanding solenoid ON/OFF with a scan tool
  • Check continuity between solenoid connector and TCM connector for open circuit

Signal parameters

  • Coil resistance (Ω) — measure at solenoid with harness disconnected; typical range often falls between ~10–50 Ω (consult OEM spec for exact value)
  • Quiescent voltage at solenoid connector — typically ~0V on switched side and battery voltage on supply side depending on circuit design
  • Commanded signal — TCM typically uses a switched ground or PWM to control EPC; expected 0–12 V behavior depending on design
  • PWM frequency — typically in the tens to low hundreds of Hz (consult OEM spec)
  • Duty cycle — varies 0–100% depending on commanded pressure; live data should change when commanding solenoid

Diagnostic algorithm

  1. Connect scan tool, verify P1746 is current or historic, record freeze frame and related codes.
  2. Perform a thorough visual inspection of the EPC Solenoid A connector, wiring, and transmission harness for damage, corrosion, or disconnection.
  3. With ignition OFF, disconnect the solenoid connector. Measure coil resistance across the solenoid pins with a multimeter. Compare to OEM specification. An open (infinite) reading indicates a failed coil.
  4. Check for power and ground at the solenoid connector with ignition ON (back-probe). Identify which pin is supply and which is switch/ground per wiring diagram.
  5. Command the solenoid ON/OFF using the scan tool while monitoring the connector. Observe voltage/ground switching or PWM signal. If the TCM is commanding but no signal, suspect TCM or intermediate wiring/open.
  6. Check continuity from the solenoid connector to the TCM connector for open circuits. Repair any open wires, broken strands, corroded pins, or damaged insulation found.
  7. If wiring and connector are good but solenoid coil is open, replace the solenoid assembly and re-test.
  8. If solenoid and wiring check good but no commanded output from TCM, verify related fuses/grounds and consult electrical diagram. If necessary, test or replace the TCM per OEM procedures.
  9. After repairs, clear codes and perform a test drive or TCM-driven actuations to confirm the fault does not return.

Likely causes

  • Wire damage between TCM and EPC Solenoid A (most common)
  • Corroded/poor connector connection at the solenoid
  • Failed EPC Solenoid A coil
  • Faulty TCM output stage (less common)

Fault status

⚠️ Status
P1746 — Electronic Pressure Control (EPC) Solenoid A: Open circuit detected by transmission control module. Check solenoid, wiring, connectors, fuses/grounds, and TCM output.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

P0753 P0756 P0776 P1747 P2763
166

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