Skip to content
Skip to content

OBD-II Code

P1750

Severity

Not yet reviewed

Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.

Can you drive it

We cannot say

Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.

Indicative cost (USD)

$80–$2,200

From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.

P1750 is a Mitsubishi-specific code meaning the TCM detected a fault in the Transmission Control Solenoid circuit — typically the line-pressure solenoid (PCS) or one of the shift solenoids (SS-A/SS-B) on the F4A4 / F5A5 / W5A5 family of 4- and 5-speed automatics, or a stepper-motor fault on the JATCO CVT.

How a shop works this

Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.

  1. Note every code that is set, not just this one.

    Codes that appear together usually narrow the cause faster than any one of them read alone.

  2. Read the freeze frame — the conditions the fault was recorded under.

    Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.

  3. Confirm the fault is current rather than history.

    Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.

  4. Then follow the diagnostic notes further down this page, in the order they are written.

    They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.

If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.

Common symptoms

  • Check engine light
Read the full diagnostic procedureP1750 is a Mitsubishi-specific code meaning the TCM detected a fault in the Transmission Control Solenoid circuit — typically the line-pressure solen…

P1750 is a Mitsubishi-specific code meaning the TCM detected a fault in the Transmission Control Solenoid circuit — typically the line-pressure solenoid (PCS) or one of the shift solenoids (SS-A/SS-B) on the F4A4 / F5A5 / W5A5 family of 4- and 5-speed automatics, or a stepper-motor fault on the JATCO CVT. The TCM monitors solenoid current draw against a reference window; out-of-range current sets P1750 along with a sub-code identifying which solenoid.

Cheapest-first ladder

  1. Check ATF level and condition — Mitsubishi's automatics are intolerant of overdue fluid, and burnt fluid with a varnish smell will gum solenoid spools and trigger P1750 long before mechanical failure ($0, 5 min, run engine warm with selector in N per Mitsubishi FSM).
  2. Scan live data and command each solenoid individually with bidirectional control — a healthy Mitsubishi PCS shows 0.3-1.0A duty-cycled at idle (line pressure modulation), and shift solenoids show clean on/off transitions at 0V or 12V; a solenoid stuck at 0A or pegged at the upper current limit identifies the failed unit.
  3. Ohm each solenoid at the trans connector — Mitsubishi spec is 3-7 ohms for shift solenoids and 4-8 ohms for the PCS at room temp; open circuit (infinite ohms) or short to ground (under 1 ohm) means failed coil.
  4. Pan drop and inspect for clutch material before any solenoid replacement — fine bronze flake or black clutch dust means the solenoid is a symptom of a wearing pack, and replacing only the solenoid leaves the root cause in place. Expensive-misdiagnosis caveat: don't replace the entire valve body for P1750 before checking the internal connector at the trans bulkhead — Mitsubishi's bulkhead connector is a known leak point, and ATF migration along the harness wicks into the body-side connector and corrodes the TCM pins, mimicking solenoid failure; the fix is a $40 connector pigtail and reseal, not an $1,800 valve body.
Vehicle-specific patterns2002-2007 Mitsubishi Lancer 2.0L (4G94) with the F4A4 4-speed throws P1750 from PCS contamination at 100-130k miles — the line-pressure solenoid is t…
  • 2002-2007Mitsubishi Lancer 2.0L (4G94) with the F4A4 4-speed throws P1750 from PCS contamination at 100-130k miles — the line-pressure solenoid is the first to fail because it duty-cycles continuously.
  • 2004-2011Mitsubishi Galant 2.4/3.8L with the F4A5/W5A5 family commonly throws P1750 from shift-solenoid B failure that causes a 2-3 shift flare before the code sets.
  • 2003-2008Mitsubishi Endeavor 3.8L and 2006-2012 Eclipse 3.8L share the W5A5 5-speed and the same shift-solenoid failure mode.
  • 2007-2013Mitsubishi Outlander 3.0L (6B31) with the F4A5 4-speed (pre-CVT models) sees P1750 from the same PCS contamination; the CVT variants throw a different P175x sub-code for stepper-motor faults.
  • 2001-2006Mitsubishi Montero Sport 3.5/3.8L (V4AW3-equipped) throws P1750 from harness chafe where the trans harness crosses the bellhousing flange.

Estimated repair$80 to $2,200.

Look up another code

More free tools

VIN DecoderDecode year, make, model, engine, recalls.Maintenance ScheduleOil, timing belt, fluids, by vehicle.Tire SizeOEM vs new — diameter delta + speedo error.Gas CostWeekly, monthly, annual fuel math.

See all 9 tools