Damaged wiring or chafed loom between the transmission control module and the gearbox connector; Corroded, wet or loose gearbox connector or terminals; Faulty electronic pressure control solenoid (open or shorted winding); Internal gearbox harness fault or contamination of the solenoid by worn clutch material; Low or degraded transmission fluid affecting the solenoid and valve body; Low battery voltage or poor earth causing erratic solenoid readings; Faulty transmission control module driver circuit.

P1747

Electronic Pressure Control Solenoid Circuit.

Mazda
Powertrain
Manufacturer code
Medium severity

How this code is built

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

What it means

On Mazda, P1747 means the transmission control module has detected a fault in the electronic pressure control solenoid circuit in the automatic gearbox. This solenoid sets line pressure, which governs how firmly clutches engage and how smooth shifts feel. The code sets when the commanded and monitored electrical state of the circuit disagree, for example through a short, an open circuit or abnormal resistance. The exact test conditions and affected gearbox vary by model and transmission type.

Symptoms

Harsh or slammed gear changes
Delayed or flaring shifts
Gearbox stuck in a single gear (limp mode)
Gearbox warning light or check engine light on
Slipping under load or poor acceleration
Reduced fuel economy

Possible causes

Damaged wiring or chafed loom between the transmission control module and the gearbox connectorlikely
Corroded, wet or loose gearbox connector or terminalslikely
Faulty electronic pressure control solenoid (open or shorted winding)likely
Internal gearbox harness fault or contamination of the solenoid by worn clutch materialpossible
Low or degraded transmission fluid affecting the solenoid and valve bodypossible
Low battery voltage or poor earth causing erratic solenoid readingspossible
Faulty transmission control module driver circuitrare

How to diagnose

Read all stored codes and freeze frame data to see when the fault set and whether other gearbox or engine codes are present
Check the battery condition and charging voltage, and the main earths, as low voltage can upset solenoid circuits
Check the transmission fluid level and condition against the manufacturer's procedure, noting any burnt smell or debris
Inspect the wiring and gearbox connector for chafing, heat damage, water ingress, bent pins and corrosion
Measure the solenoid resistance at the gearbox connector and compare with the specification for that model and transmission
Check the harness for continuity, and for shorts to earth or voltage, with the connector disconnected at both ends
Use a scan tool to command the solenoid and watch the live line pressure or current data, where supported
Check for relevant technical service information or calibration updates for the specific model

How to fix

Repair or replace damaged wiring and renew faulty connector terminals
Clean and secure the connector, and fix any source of water or fluid ingress
Replace the electronic pressure control solenoid if its resistance or operation is out of specification
Service the gearbox, correcting the fluid level and condition, and inspect the valve body if contamination is found
Repair the battery, charging system or earth fault
Replace or repair the transmission control module only after wiring and solenoid faults have been ruled out, and apply any outdated calibration update if one is identified

Can I keep driving?

Medium severity

The car may be driveable, but harsh shifts or limp mode can cause accelerated clutch wear and gearbox damage. Avoid heavy loads and towing, and have it checked soon.

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