Staff Answer
Oct 27, 2026 - 03:59 PM
Diagnostic Trouble Code (DTC) P1773 stands for "Automatic Transmission System Malfunction" or a related communication/solenoid circuit fault on Mazda vehicles. Depending on the exact powertrain architecture, it can indicate a fault within the transmission pressure control circuit, a CAN-bus communication error between the PCM/TCM and ABS modules, or an issue within auxiliary control circuits.
When the Powertrain Control Module (PCM) or Transmission Control Module (TCM) detects signal discrepancies, improper pressure control feedback, or communication loss exceeding factory threshold timers, DTC P1773 is triggered, often placing the vehicle into a protective fail-safe or limp mode.
Common Symptoms of DTC P1773
-
Illuminated Check Engine Light (CEL): The dashboard turns on the Malfunction Indicator Lamp (MIL).
-
Transmission Fail-Safe / Limp Mode: The vehicle restricts gear shifting, locks into a default gear ratio, or displays reduced acceleration.
-
Harsh or Erratic Shifting: Delayed engagement when shifting between Park, Drive, and Reverse.
-
Inoperative Cruise Control: Automatic deactivation of cruise control functions by the PCM due to active powertrain network codes.
Primary Root Causes of DTC P1773
-
Damaged Wiring Harness or Loose Connectors: Chafed, pinched, or corroded wiring along the TCM, PCM, or transmission case harness.
-
CAN-Bus Data Communication Failure: High resistance, open circuits, or shorted data lines connecting the transmission control system with ABS/DSC modules.
-
Internal Solenoid or Valve Body Malfunction: Electrical short, open winding, or hydraulic sticking within the transmission control solenoids.
-
Low or Degraded Transmission Fluid: Oxidized ATF or incorrect fluid levels causing hydraulic pressure regulation errors.
-
Faulty Powertrain or Transmission Control Module: Rare internal module hardware failure or corrupted software calibration.
This video provides a complete visual breakdown of how to inspect wiring, test communication circuits, and resolve Mazda P1773 transmission fault codes.
Add New Comment