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DTC codes / Nissan codes / P1753

P1753 · NissanTCM A/T Lockup Solenoid Valve "A" Fault

P1753 on Nissan vehicles means the Transmission Control Module (TCM) has detected an electrical fault in the torque converter lockup solenoid valve circuit, often called the lockup solenoid 'A'. The TCM commands the solenoid to engage the torque converter clutch for fuel economy and cooler fluid, but the circuit current or voltage falls outside the expected range, so the TCM sets this code and may disable lockup until repaired.

SystemPowertrain
Code typeNissan specific
SeverityMedium
Fix difficultyProfessional
AreaTransmission

Symptoms you may notice

  • The Service Engine Soon or Check Engine light illuminates, often with no other noticeable symptoms at first.
  • The torque converter clutch may fail to engage, causing slightly higher engine rpm at highway cruise speeds and a small drop in fuel economy.
  • Some drivers notice a shudder or vibration at steady 40–60 mph when the TCM attempts to apply lockup.
  • The transmission may feel like it is slipping or hunting between lockup and unlock during light-throttle cruising.
  • In rare cases the engine may stall when coming to a stop if the lockup clutch stays applied, but this is uncommon with this specific circuit fault.
  • The transmission may default to a fail-safe mode with firmer or delayed shifts if the TCM sees repeated circuit errors.

Common causes, most likely first

  1. A failed torque converter lockup solenoid valve 'A' inside the transmission valve body, often due to worn internal seals or an open coil.
  2. Damaged or corroded wiring and connector pins between the TCM and the transmission solenoid pack, especially at the transmission case pass-through connector.
  3. Transmission fluid that is degraded, contaminated, or low, causing solenoid sticking and erratic circuit feedback.
  4. A faulty TCM or a poor ground connection at the TCM, though this is less common than solenoid or wiring faults.
  5. Valve body wear or debris blocking the lockup solenoid hydraulic circuit, which can mimic an electrical solenoid failure.
  6. Aftermarket or incorrect transmission fluid causing seal swelling and solenoid malfunction.
  7. A short to ground or short to power in the lockup solenoid control wire, often from chafed harness insulation near hot or moving components.

How to diagnose and fix it

  1. Check the transmission fluid level and condition first; top off or replace fluid only if it is clearly degraded, and note any burnt smell or debris.
  2. Inspect the transmission wiring harness and connectors for corrosion, chafing, or loose pins, especially at the case connector and TCM plugs.
  3. Use a scan tool to command the lockup solenoid on and off while watching live data for current and voltage; a solenoid that does not respond electrically points to a coil or circuit fault.
  4. Measure the resistance of the lockup solenoid at the transmission connector and compare it to the factory specification for your Nissan model.
  5. If resistance is out of spec or the solenoid does not click when commanded, remove the valve body and replace the lockup solenoid valve 'A'.
  6. After repair, clear the code and perform a relearn or adaptation drive cycle as required for your Nissan transmission, then verify lockup engagement at steady cruise.
  7. If the solenoid and wiring test good but the code returns, inspect the valve body for wear or debris and check TCM grounds and power feeds before condemning the TCM.

What Nissan techs check before replacing the solenoid

  • A loose or corroded transmission case connector is a frequent cause of P1753 on older Nissan models, and simply cleaning and reseating it can cure the code without dropping the pan.
  • The TCM may set P1753 from a momentary glitch during low-voltage cranking, so always check battery and charging system health before chasing the solenoid circuit.
  • A sticking lockup solenoid can be caused by debris from a failing torque converter clutch, so if the fluid shows clutch material, replacing only the solenoid may lead to a repeat failure.
  • Some Nissan transmissions share the lockup solenoid circuit with the line pressure solenoid ground, so a fault in a neighbouring solenoid can set P1753 as a secondary code.
  • P1753 does not always mean the solenoid is dead; a shorted or open control wire inside the transmission harness can produce the same code, so resistance testing at the TCM side is essential.

Can I keep driving with P1753?

You can usually drive short distances at moderate speeds with P1753, but avoid sustained highway cruising or heavy towing because the torque converter clutch may not engage and transmission fluid can overheat. If you feel shuddering, slipping, or the engine stalls when stopping, park the vehicle and arrange a professional diagnosis before further driving.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Nissan vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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