OBD-II Diagnostic Trouble Code
P0684
Glow Plug Control Module to PCM Communication Circuit Range/Performance
P
Powertrain
engine / trans
engine / trans
0
Generic
SAE standard
SAE standard
6
Computer & output circuits
84
Glow Plug Control Module to PCM Communication Circuit Range/Performance
Severity · general guide
Moderate
Fix soon — usually won't strand you
Code type
Generic
System
Powertrain
Standard
ISO/SAE Controlled
Fault type
Range/Performance