Dynamic Skip Fire (DSF) Control Module Communication Error
2014-2021 Mazda Mazda6 2.5L I4
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
- Check communication between DSF module and PCM
- Read DSF module fault codes
- Inspect CAN bus wiring to DSF module
- Verify software versions match
- 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
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
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.