P0675

Code

Generic P — Powertrain

Cylinder 5 Glow Plug Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 32 EN: 42 RU: 36

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Read freeze frame and pending codes; confirm P0675 is current
Visually inspect glow plug connector, harness, and ground for damage or corrosion
Check glow plug fuse and relay for continuity and operation
Measure voltage at cylinder 5 glow plug connector during glow/ preheat cycle
Measure resistance of cylinder 5 glow plug (engine cold) and compare to other cylinders
Perform wiggle test on wiring/connector while monitoring voltage or checking for intermittent code

Glow plug resistance (cold): commonly around 0.2–3.0 ohms per plug (varies by engine). A very high or infinite reading = open circuit.
Supply voltage at plug during preheat: near battery voltage (~11–13.5 V) while relay/driver is active
Current draw per glow plug: typically single-digit to low‑tens of amps (depends on design); abnormally low current indicates open/high resistance
Preheat duration: a few seconds to tens of seconds depending on ambient/temp and engine control strategy

Verify the code: retrieve freeze frame data and confirm P0675 is active and not a historical/one-time event.
Visual inspection: examine glow plug #5 connector, wiring, and cylinder head area for corrosion, melted insulation, or damage.
Check power/ground: with key on (engine off), verify the glow fuse and relay are intact and that power reaches the glow plug harness when preheat is requested.
Resistance test: remove electrical connector and measure resistance of glow plug #5 to engine ground (engine cold). Compare value to known good plugs or service spec. Infinite or very high = open.
Voltage during preheat: back-probe the connector and crank or use glow preheat function to verify voltage is supplied to the plug during the preheat cycle. No voltage suggests relay/driver/wiring fault.
Current/driver test: if voltage is present but plug reads low current or high resistance, replace the glow plug. If no voltage and relay is good, trace continuity to PCM and test driver output per service manual.
Wiggle/intermittent check: with monitor connected, wiggle harness and connectors to reproduce intermittent faults and inspect connector pins for tightness.
Repair and verify: repair or replace faulty glow plug, connector, wiring, relay or fuse as required. Clear codes and perform multiple start cycles and a road/cold-start test to confirm the fault does not return.
If wiring and components test good, consult manufacturer service data and test PCM driver output before replacing control module.