ShopBaseFree forever shop management software for auto repair shops
Try ShopBase Free β†’
P3625

Dynamic Skip Fire (DSF) Control Module Communication Error

2014-2021 Mazda Mazda6 2.5L I4

Moderate SeverityPowertrainGeneric (SAE)

Description

The Dynamic Skip Fire control module that selectively fires individual cylinders based on demand has a communication fault with the PCM.

Symptoms

  • Check Engine Light
  • DSF system disabled
  • Constant all-cylinder firing
  • Reduced fuel economy
  • Engine may vibrate more than usual
  • No smooth cylinder deactivation transitions

Common Causes

  • CAN bus communication fault
  • DSF module failure
  • PCM DSF driver circuit issue
  • Wiring harness damage
  • Software version mismatch

Diagnostic Steps

  1. Check communication between DSF module and PCM
  2. Read DSF module fault codes
  3. Inspect CAN bus wiring to DSF module
  4. Verify software versions match
  5. Test DSF module power supply

Repair Notes

Repair CAN bus wiring. Replace DSF module if internal fault. Update software if version mismatch detected.

Related Codes

P3620Cylinder Deactivation System Bank 1 MalfunctionP3621Cylinder Deactivation System Bank 2 Malfunction

Other Powertrain Codes

P3625 on Other Vehicles

Common Questions

What does code P3625 mean on a 2014-2021 Mazda Mazda6?

P3625 stands for "Dynamic Skip Fire (DSF) Control Module Communication Error". The Dynamic Skip Fire control module that selectively fires individual cylinders based on demand has a communication fault with the PCM.

What are the symptoms of P3625 on a Mazda Mazda6?

Common symptoms of P3625 include: Check Engine Light, DSF system disabled, Constant all-cylinder firing, Reduced fuel economy, Engine may vibrate more than usual, No smooth cylinder deactivation transitions.

What causes P3625 on a 2014-2021 Mazda Mazda6?

Common causes of P3625 include: CAN bus communication fault, DSF module failure, PCM DSF driver circuit issue, Wiring harness damage, Software version mismatch.

View Labor Times | View Torque Specs | View Fluid Specs