OBD-II Code
P0382
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$80–$950
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$80 (single plug) to $950 (controller + multiple plugs).
P0382 is platform-dependent — on many domestic light-truck and passenger applications it sets as 'Exhaust Gas Recirculation Sensor B Circuit' (a secondary EGR position or pressure feedback fault), while on diesel platforms it commonly latches as 'Glow Plug B Malfunction' indicating the secondary glow-plug bank or a specific plug in a multi-channel glow-plug control module has failed its current-monitor check.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP0382 is platform-dependent — on many domestic light-truck and passenger applications it sets as 'Exhaust Gas Recirculation Sensor B Circuit' (a seco…
P0382 is platform-dependent — on many domestic light-truck and passenger applications it sets as 'Exhaust Gas Recirculation Sensor B Circuit' (a secondary EGR position or pressure feedback fault), while on diesel platforms it commonly latches as 'Glow Plug B Malfunction' indicating the secondary glow-plug bank or a specific plug in a multi-channel glow-plug control module has failed its current-monitor check.
Cheapest-first ladder, diesel context
- at key-on with engine cold (coolant below 50 F), watch glow-plug system current on the scan tool — total system current should jump to roughly 7-20 A per plug during the initial 5-30 second wait-to-start phase, then taper as plug resistance climbs with temperature; a bank that draws zero or that pulls 2x normal indicates an open or shorted plug.
- Disconnect each glow plug at the bus bar and measure resistance pin-to-ground individually — a healthy plug reads 0.4 to 2.0 ohms cold; an open plug reads infinity, a shorted plug reads under 0.2 ohms.
- Backprobe the glow-plug control module (GPCM) output for the affected bank and verify PWM duty cycle commands 0-100% in response to coolant temperature; a stuck-off output with all plugs good points to the module, a stuck-on output points to a shorted driver. Expensive-misdiagnosis caveat: before replacing the glow-plug control module, check the glow plug RESISTANCE individually — a single shorted plug pulls the control module current high and sets P0382, but the module is fine; replacing the module without fixing the shorted plug just kills the new module on the first cold start.
Vehicle-specific patterns2003-2007 Ford 6.0L Powerstroke is the canonical P0382 ticket — the GPCM mounts on the passenger-side valve cover, sees direct heat soak, and fails r…
- 2003-2007Ford 6.0L Powerstroke is the canonical P0382 ticket — the GPCM mounts on the passenger-side valve cover, sees direct heat soak, and fails repeatedly; Ford TSB guidance is to verify all eight plugs ohm out before reinstalling a new module.
- 2008-2010Ford 6.4L Powerstroke throws P0382 from individual plug failures more often than module failures, but the failure mode that kills GPCMs is a single shorted plug taking the module with it.
- 2001-2010GM Duramax LB7-LMM mounts the glow-plug controller on the side of the engine block and throws P0382 when the controller's internal solder joints crack from thermal cycling.
- 2007-2018RAM Cummins 6.7L places glow plugs directly in the cylinder head (rather than a grid heater intake) and throws P0382 from individual plug failures; the cheaper fix is per-plug rather than full module.
Estimated repair$80 (single plug) to $950 (controller + multiple plugs).
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