P1674

Symptoms

• Unstable engine operation
• Check Engine Light Illuminates
• Power Loss
• Problems starting the engine
• Malfunctions of other vehicle systems

Causes

• Failure to update ECU software
• Control unit memory damaged
• Short circuit in the ECU power supply circuit
• Electrical interference
• Physical damage to the control unit

How to Fix

1. Check power supply and grounding of the ECU
2. Read error codes and freeze frame data
3. Try to reset the error and reboot the system
4. If necessary, reflash the ECU
5. As a last resort, replace the control unit

Related codes

Error P1674 by Vehicle Brand