P1740 Lock-up or overdrive solenoid performance (Dodge) or 4th clutch pressure switch fault (Honda)

TCC/overdrive solenoid or 4th clutch pressure switch

P1740 in short

P1740 means different things by maker. On Dodge it means the lock-up or overdrive solenoid is not performing as expected, often with delayed lock-up. On Honda dealers read it as a 4th clutch pressure switch fault, usually with a flashing D light. Have the transmission inspected soon.

P1740 is a manufacturer code, so the meaning depends on the make. Chrysler bulletins for 1999–2001 Dodge trucks describe it as torque converter clutch or overdrive solenoid performance, seen as late lock-up at cruise.

On Honda, dealers quoted in owner complaints read P1740 as a 4th clutch pressure switch failure. Those owners saw a flashing D on the 2002 Odyssey and 2004 Pilot, and some were quoted a transmission.

We could not confirm one meaning for other makes, so this page covers only Dodge and Honda.

Pick your make

P1740 is a manufacturer-specific code: its meaning depends on who built the car.

Other makes: meaning not verified. Check with a scan tool that reads manufacturer definitions.

Most likely causes

  1. Torque converter clutch or overdrive solenoid control (Dodge)

    Supported by vehicle data
    Why it ranks here
    Chrysler bulletins cover P1740 with delayed lock-up on 1999–2001 Ram, Dakota and Durango.
    What would change this
    Rises on a covered Dodge truck that has not had the bulletin repair.

  2. 4th clutch pressure switch or its wiring (Honda)

    Supported by vehicle data
    Why it ranks here
    Honda dealers quoted in complaints read P1740 as a 4th pressure switch failure.
    What would change this
    Rises if the switch or its connector tests faulty.

  3. Internal transmission wear behind the pressure reading (Honda)

    Possible — needs testing
    Why it ranks here
    A Honda dealer quoted a transmission and torque converter for P1740 on a 2004 Pilot, which suggests the pressure itself may be low, not just the switch.
    What would change this
    Rises if fluid is dark or contains debris, or there is slipping into 4th.

What to test first

Start at step 1. Each result tells you what it means and where to go next.

  1. Read codes from the engine and transmission modules with a scan tool that supports both, before anything is cleared.

    Low riskTool: scan tool that reads the transmission module

  2. Check for a P1740 bulletin for your VIN at a dealer or on the NHTSA site.

    Low risk

  3. Have a shop test the pressure switch or solenoid circuit and check fluid condition and line pressure.

    Best left to a shopTool: scan tool and pressure gauge

    Warning:Shop test. It needs the maker's procedure.

Symptoms

  • Check engine light
  • Late torque converter lock-up at cruise (Dodge)
  • Transmission indicator flashing "D" (Honda) Gets more serious: stop and have it checked.
  • Transmission stuck in one gear (limp-home mode) Gets more serious: stop and have it checked.

How to fix

  1. Do not clear the code before the transmission module has been read.

  2. On a Dodge, ask a dealer whether your VIN is covered by a P1740 bulletin.

Parts and cost context

  • Transmission control module (TCM):Neither meaning points to the transmission computer first; test the solenoid, switch and wiring.

Labor varies by vehicle and shop; get a quote before you approve a repair.

Compare used part prices on PartPriceGuide

On your vehicle

Dodge

  • 1999–2001 · Ram

    Supported by vehicle data

    Chrysler bulletins cover P1740 (TCC or O/D solenoid performance) with delayed lock-up. The Dakota and Durango are also covered. The bulletin is on NHTSA, but whether it is still current is not verified, so it is labelled vehicle data rather than confirmed.

  • 210800Status unverified

    Delayed TCC engagement, P1740 TCC or O/D solenoid performance

    1999–2000ram · issued · NHTSA 614659

    Delayed torque converter lock-up that may light the MIL with P1740. Only the NHTSA flat-file summary was read, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 211100Status unverified

    MIL with P1740 TCC or OD solenoid performance

    2000–2001dakota, durango, ram · issued · NHTSA 614660

    MIL with P1740. Also lists the Ram Van. Only the NHTSA flat-file summary was read, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Honda

  • 2002 · Odyssey

    Supported by vehicle data

    An owner reports a Honda dealer reading P1740 as a 4th pressure switch failure with a flashing D; a 2004 Pilot owner reports the same reading.

  • P0700Transmission module requests the check engine light

    Primary / secondary Possible — needs testing

    Likely primary: P1740. On cars with a separate transmission module, a basic code reader may show only P0700, which means the module has stored its own code. P1740 can be that code, so fix P1740 and P0700 goes with it.

  • P0740Torque converter clutch control circuit fault

    Same system Possible — needs testing

    On Dodge, P0740 is a circuit fault in the same lock-up control.

All Transmission codes

P1740 questions

Why does P1740 mean different things on different cars?

P1xxx codes are set by each maker. Dodge uses P1740 for lock-up or overdrive solenoid performance and Honda for the 4th clutch pressure switch, so always read it with the make in mind.

Sources and review

  1. Cal. Code Regs. Tit. 13, § 1968.2 — Malfunction and Diagnostic System Requirements (OBD II) — California Air Resources Board (via Cornell LII)
  2. Honda owner's manual: Continuously Variable Transmission, shift lever position indicator (p. 166) — American Honda Motor Co. ,
  3. Chrysler 210800: Delayed TCC engagement, P1740 TCC or O/D solenoid performance — DaimlerChrysler / NHTSA ,
  4. Chrysler 211100: MIL with P1740 TCC or OD solenoid performance — DaimlerChrysler / NHTSA ,
  5. NHTSA complaint ODI 10418028: 2002 Honda Odyssey dealer code readout — NHTSA Office of Defects Investigation
  6. NHTSA complaint ODI 10447125: 2004 Honda Pilot dealer code readout — NHTSA Office of Defects Investigation
  7. DTC P0700 — Saab 9-5 (9650) 2010 Workshop Information System — SaabWISOnline (community rehost of Saab/GM service information)
Last reviewed
Written by
Saurabh K.
Editorial review
Pending
Technician review
Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

My Car

Pick your car and code pages will point out notes and bulletins for it. Saved only in this browser.

Fill this in from your VIN

Used once to identify your engine; not stored.