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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0380 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0380 code

P0380 is a diagnostic trouble code (DTC) for "Glow Plug/Heater Circuit “A” Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0380 DIAGNOSTIC Get a fair and transparent estimate upfront

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.

trouble codes
Check Engine Light
P0380

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0380 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,901

Rating Summary
3,566
166
43
25
101
3,566
166
43
25
101

Chris

19 years of experience
1240 reviews
Chris
19 years of experience
I thought i completed this review...but it slipped through the cracks. As I am about to recommend a friend to use Chris for service, I was reminded. Best service I could ask for!
2007 HONDA CR-V - CHECK ENGINE LIGHT IS ON - MISSION VIEJO, CALIFORNIA

Edmar

19 years of experience
40 reviews
Edmar
19 years of experience
Edmar took the time to properly diagnose my issue and perform the proper checks to confirm the oxygen sensor code that was displayed from my car's electronic control module. (Check engine light came on.) I have already scheduled him to perform the repair now that we know the issue and know what parts are needed.
2004 TOYOTA HIGHLANDER - CHECK ENGINE LIGHT IS ON - FRISCO, TEXAS

Dan

36 years of experience
624 reviews
Dan
36 years of experience
Intelligent. Thorough. Entertaining.
2011 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - BUFORD, GEORGIA

James

27 years of experience
331 reviews
James
27 years of experience
James showed up early to the appointment. He was very professional and explain everything in detail. I definitely would recommend his services and I will definitely book with him next time I'm in need of service.
2004 PONTIAC GRAND AM - CHECK ENGINE LIGHT IS ON - ORLANDO, FLORIDA

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...

Related questions

Q: Q: Throttle Position Sensor

Anytime you go to a parts store to get a computer scan for the Check Engine Light you are not getting a diagnosis of the problem but only a code retrieved from the engine control module (ECM) memory. This is...

Q: Service engine soon light is on can not turn it off

In order to get the check engine light to turn off is to get a check engine light inspection having a mechanic like one from YourMechanic come to you and scan the computer to retrieve the stored codes and diagnose...

Q: P0442

As you may already know, this may be related to a faulty or leaking gas cap, however this can also be related to several other factors such as the following: A non-conforming gas cap (i.e. not factory/original brand) A...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com