What Does P0675 Mean?
The PCM has detected a malfunction in the cylinder 5 glow plug circuit on a diesel engine. This code applies to engines with 5 or more cylinders (typically V6, V8, or inline-5/6 diesels). The glow plug or circuit for cylinder 5 is not operating correctly, affecting cold-start combustion in that cylinder. The driver may notice slightly harder cold starting and white smoke during warm-up, though with 5+ cylinders the impact of a single failed plug is less pronounced than on smaller engines.
Common Causes
40%
Failed cylinder 5 glow plug (burned out or degraded)
25%
Corroded or loose connection at cylinder 5 glow plug terminal
20%
Wiring fault between glow plug module and cylinder 5
10%
Glow plug control module output failure for cylinder 5
5%
Cylinder 5 glow plug seized in head (common on high-mileage diesels)
Diagnostic Steps
1
Measure cylinder 5 glow plug resistance after disconnecting the connector — spec 0.5-2.0 ohms. Compare to all other cylinders to identify any pattern of degradation.
2
Verify power delivery at the cylinder 5 bus bar connection during the glow cycle. No voltage indicates a wiring or module output issue.
3
On V-configuration engines, cylinder 5 is on bank 2 — check if any other bank 2 glow plug codes are set (P0676-P0678), which could indicate a common bus bar or wiring issue for that bank.
4
Inspect the bus bar and wiring for cylinder 5 — on V-engines, the rear bank glow plugs can be difficult to access, and wiring can be pinched or damaged by intake manifold or valve cover gasket work.
5
If multiple glow plugs are reading out of spec, replace them as a complete set. Glow plugs age at similar rates and replacing just one often results in repeated failures on adjacent cylinders.
Estimated Repair Cost
$60 - $400
Parts + labor, varies by vehicle and location
The PCM has detected a malfunction in the cylinder 5 glow plug circuit on a diesel engine. This code applies to engines with 5 or more cylinders (typically V6, V8, or inline-5/6 diesels). The glow plug or circuit for cylinder 5 is not operating correctly, affecting cold-start combustion in that cyli...
The most common cause of P0675 (Cylinder 5 Glow Plug Circuit) is: Failed cylinder 5 glow plug (burned out or degraded)
Typical repair costs for P0675 range from $60 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
On engines with 5 or more cylinders, a single failed glow plug has less cold-start impact. However, in very cold conditions, every glow plug matters. The engine will run normally once warm. If combined with other glow plug faults, cold starting may be severely compromised.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0675 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Diesel Glow Plug System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
