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

3,203

Rating Summary
2,919
140
39
22
83
2,919
140
39
22
83

Nathan

26 years of experience
198 reviews
Nathan
26 years of experience
Nathan was knowledgeable about my car and very educational as well. He explained everything he was doing and why. I admire his attention to detail. He really showed genuine interest and attentiveness to the problem. He’s a great conversationalist and was easy to work with.
2013 CHEVROLET CRUZE - CHECK ENGINE LIGHT IS ON - GLENPOOL, OKLAHOMA

Mack

19 years of experience
72 reviews
Mack
19 years of experience
Very nice and knew what he was doing. Got what I needed done even though was told wrong by the office.
1999 FORD F-150 - CHECK ENGINE LIGHT IS ON - MIDLOTHIAN, TEXAS

Scott

31 years of experience
24 reviews
Scott
31 years of experience
Very nice friendly mechanic. Very helpful with with questions that I had. Offered good advice. He explained some of the problems to me and what should be the next to resolve it before spending unnecessary monies. This was my first time using him and will not be my last. I would recommend him to anyone. Especially women because he does not seem to take advantage of our knowledge of not knowing things about cars.
2001 HYUNDAI ELANTRA - CHECK ENGINE LIGHT IS ON - PARKVILLE, MARYLAND

Tyrone

6 years of experience
61 reviews
Tyrone
6 years of experience
He showed up on time and got my diagnostic done quickly. He also gave me honest recommendations on what I need to do for my car.
2008 HONDA ACCORD - CHECK ENGINE LIGHT IS ON - CULVER CITY, CALIFORNIA

More related articles

P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...
P2422 OBD-II Trouble Code: Evaporative Emissions Control System (EVAP) Vent Valve Stuck Closed
Diagnostic Trouble Code (DTC): P2422 P2422 code definition Evaporative Emissions Control System (EVAP)...
P0359 OBD-II Trouble Code: Ignition Coil I Primary/Secondary Circuit Malfunction
P0359 code definition The P0359 code indicates that a fault has been detected in one of the vehicle’s ignition coils, generally the number 9 coil. This code can also be associated...

Related questions

Q: Q: check engine light is on

A fault code p0304 is typically caused by a faulty plug or a failed ignition coil. If it has been quite a while since there has been a tune up done, I would start there. Many times a misfire can...

Q: Can I go to a trip through the state with the following problems with my car?

You should ask the shop that gave you the estimate since they quoted you to replace the transaxle. The transaxle problem may be something that could leave you stranded and cost thousands of dollars to replace this part. The car...

Q: 2012 GMC Sierra 2500HD No Blend Door Working

Hello, you are going to need a diagnostic chart for this type of issues. The chart gives you a process to a path of repair or replacement for each code. When you have many system codes you would first check...

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