Skip the auto shop - Our mechanics make house calls

P0380 OBD-II Trouble Code: Glow Plug/Heater Circuit “A” Malfunction

check engine light

P0380 code definition

The P0380 trouble code notes an issue with the glow plug heater circuit A.

What the P0380 code means

The P0380 code is a standard OBD-II trouble code suggesting an issue within the glow plug heater circuit. When the powertrain control module (PCM) detects a variation in the voltage from the “A” area of the glow plug heater circuit that is more than a 10 percent variation from the expected output, the P0380 code will be detected. This code is associated with numerous other glow plug trouble codes.

What causes the P0380 code?

Many things can trigger the P0380 code. Some of the more common issues include:

  • Malfunctioning glow plug or relay
  • Faulty glow plug timer
  • Faulty glow plug module
  • Blown fuse in the circuit
  • Faulty wiring and electrical connectors, such as corroded connectors or open wiring

What are the symptoms of the P0380 code?

When the P0380 trouble code is triggered, it will likely be accompanied by the check engine soon Warning Light, as well as the globe plug indicator Warning Light. The vehicle also may have a difficult time starting, may be excessively noisy during start-up, and may produce white exhaust smoke.

How does a mechanic diagnose the P0380 code?

The P0380 code will be diagnosed using a standard OBD-II trouble code scanner. A professional mechanic will use the scanner to observe the freeze frame data. Using the freeze frame data, the mechanic can learn more about the P0380 code, and search for additional codes (it is common for the P0380 code to be accompanied by other glow plug trouble codes). The technician will then reset the trouble codes and restart the vehicle, to see if the codes return. If the codes do not return, it is assumed that they are intermittent and that the glow plug heater circuit is in working order.

If the P0380 code returns, the mechanic should inspect the wires, connectors, and fuses around the glow plug heater circuit. Any loose or open wires, corroded or damaged connectors, or blown fuses should be replaced. Following replacement, the trouble codes should once again be reset, and the vehicle restarted, to see if the issue has been resolved. If it has not, the mechanic will remove the glow plug in the A area and test it, as well as the relay. If needed, the components will be replaced, and all remaining trouble codes should be addressed as well.

Common mistakes when diagnosing the P0380 code

The most common mistake when diagnosing the P0380 code comes from a failure to properly follow the OBD-II trouble code diagnosis protocol. Mechanics should always follow the proper protocol in order, which includes addressing numerous trouble codes in the order in which they appear.

Failure to follow the proper protocol can also result in the glow plug or relay being replaced when the wires, connectors, or fuses were the actual issue.

How serious is the P0380 code?

A detected P0380 code is unlikely to render a vehicle as unable to operate, but it will keep the engine from running properly.

What repairs can fix the P0380 code?

The most common repairs for the P0380 trouble code include:

  • Replacement of a glow plug or glow plug relay
  • Replacement of heater circuit wires, connectors, and fuses
  • Replacement of glow plug timer or module

Additional comments for consideration regarding the P0380 code

While blown fuses in the glow plug heater circuit are commonly associated with the P0380 code, they are usually the result of a deeper issue. If a blown fuse is detected, it should be replaced, but it shouldn’t be assumed to be the only issue or the cause of the P0380 trouble code.

Need help with a P0380 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...


Related questions

Q: Acceleration hesitation while climbing up sometime check engine light appear, high fuel consumption.

I would recommend checking the mass air flow sensor as this is a commonly known part that can cause this kind of loss of power. This regulates the air intake into the fuel injection and ensures a proper air/fuel mixture....

Q: Car cut off on the highway and never started back up.

Hello there, many faults will cause your 2004 Chevrolet Impala to die while running and not restart. The P0443 code is for the Evaporative Emission Control System Purge Control Valve Circuit and though this will need to be addressed will...

Q: Fuel System?

A whirring noise is actually a common symptom of a failing fuel pump. You can rule the power steering pump in or out just by disconnecting power steering belt. Obviously, if the noise remains the same with pump disconnected, then...