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P1793

Automatic Transmission System Malfunction.

  • Infiniti
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
7
AreaTransmission
93
FaultThe specific fault in that area

What it means

P1793 on an Infiniti is logged as an Automatic Transmission System Malfunction. The transmission control unit has detected a fault within the transmission control system that it cannot assign to a more specific code. The exact trigger and the failure it covers depend on the model and transmission, so check the manufacturer's information for your vehicle.

Symptoms

  • Transmission warning light or malfunction indicator lamp on
  • Harsh, delayed or flared gear changes
  • Transmission stuck in one gear (limp mode)
  • Reduced performance or poor acceleration
  • Poor fuel economy
  • Gear selector position not matching the display

Possible causes

  • Wiring or connector fault in the transmission control circuits (chafed, corroded or loose)likely
  • Another stored transmission fault, such as a speed sensor, solenoid or range switch problem, causing this general codelikely
  • Low, degraded or contaminated transmission fluid affecting pressure or shiftingpossible
  • Faulty shift solenoid or valve body componentpossible
  • Low battery voltage or poor earth connections upsetting the control unitpossible
  • Internal transmission wear or damage, or a fault in the transmission control unit itselfrare

How to diagnose

  1. Read all stored codes and freeze frame data from every module, noting any other transmission or engine codes and the conditions when P1793 set
  2. Check the transmission fluid level and condition, following the correct procedure for your model, and look for leaks
  3. Check battery condition and charging voltage, and inspect main earth connections
  4. Visually inspect the transmission wiring harness and connectors for damage, corrosion, moisture or fluid contamination
  5. Check for relevant technical service bulletins and software updates for the model and transmission
  6. Clear the code and road test, watching live data for speed sensors, gear ratio and solenoid commands to see if the fault returns
  7. Check the electrical circuits of any component flagged by other codes, using the wiring diagram for your model
  8. If no external cause is found, arrange pressure and internal transmission testing by a transmission specialist

How to fix

  • Repair or replace damaged wiring, connectors or terminals in the transmission circuits
  • Correct the fluid level, or change degraded fluid using the specified type and procedure
  • Replace any faulty sensor, solenoid or valve body component identified by testing
  • Restore battery condition and repair poor earth connections
  • Update the control unit software if an outdated calibration is a known cause for your model
  • Repair or overhaul the transmission, or replace the control unit, only once diagnosis confirms an internal fault

Can I keep driving?

Medium severity

Short, gentle journeys are usually possible, but the car may go into limp mode and the fault could worsen. Avoid heavy loads, towing and hard acceleration, and get it diagnosed soon to prevent transmission damage. If shifting becomes severe or the car won't select gears, stop driving.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

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