P0382 OBD-II Trouble Code: Glow Plug / Heater Circuit "B" Malfunction

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

SCHEDULE P0382 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0382 code

P0382 is a diagnostic trouble code (DTC) for "Glow Plug / Heater Circuit "B" 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 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$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0382 DIAGNOSTIC Get a fair and transparent estimate upfront

P0282 code definition

The P0282 code being stored by a vehicle’s PCM means that the glow plug for a diesel engine has malfunctioned.

What the P0282 code means

Diesel engines don’t just consume a different type of fuel than the kind necessary for more conventional vehicles. They actually function a lot differently too. One example of this is the need for a glow plug. When an owner goes to start their diesel engine, the PCM (Powertrain Control Module) immediately takes a reading on the temperature of the engine.

If it finds that the temperature is too low, a glow plug is used to heat up the cylinder temperatures so that the diesel fuel will have an easier time igniting. These glow plugs will literally glow red hot in order to achieve the needed temperature for this to happen.

In some vehicles, the PCM will actually keep the glow plugs going after the engine has started. Manufacturers elect for this option when they want to reduce engine noises or simply the production of white noise.

When the P0282 code is stored by the PCM, it’s because it’s detected a problem with the glow plug heater circuit B which is keeping it from working properly.

What causes the P0282 code?

There are four main reasons that could cause this problem to occur. They are:

  • An open fuse
  • A faulty glow plug
  • A problem with the glow plug’s wiring (it’s open, damaged, short to ground, etc.)
  • The glow plug relay isn’t working correctly

In very rare cases, the PCM may actually be the thing that is faulty. Don’t go about trying to repair or replace it, though, until you’ve exhausted every other option.

What are the symptoms of the P0282 code?

Generally, if this trouble code is logged, the driver should see their check engine light come on. Other reliable signs would be:

  • The MIL (Malfunction Indicator Lamp) light comes on
  • The glow plug indicator – it’s the “Wait to Start” indicator in some vehicles – stays on longer than normal
  • It’s tough to start the vehicle in cold weather

This last one is the most common indicator. You may experience one or both of the other two too, but if your vehicle is easy to start, it’s probably not a P0282 problem.

How does a mechanic diagnose the P0282 code?

If a mechanic is working on a vehicle with a P0282 code logged, they will most likely follow this path to a resolution:

  • Use their OBD-II scanner to find out all the codes that have been stored by the vehicle’s PCM
  • Try starting the vehicle to see if it’s difficult and/or if they can reproduce the problem
  • Check all fuses to see if any are blown
  • Test the relay for the glow plug

As the problem always involves the glow plug, simply tracing the steps between it and the starter is usually enough to find the problem.

Common mistakes when diagnosing the P0282 code

The glow plug is no doubt important to finding the source of the P0282 code, but don’t just stop there. For example, you may notice there’s an issue with the relay. Address that, but continue your search for any other potential problems, especially if there were related codes found when the OBD-II scanner was used.

How serious is the P0282 code?

This isn’t the type of problem that will cause you to end up off the road, but it will keep you from getting on the road in the first place. If you live in a cold environment, a P0282 problem could mean your car stays still for a very long time.

What repairs can fix the P0282 code?

Some kind of replacement will almost surely be necessary. Whether it’s the glow plug itself, the wiring, connectors, etc. something is going to get changed out.

Additional comments for consideration regarding the P0282 code

Related codes like P0280, P0281, P0282 and P0284 are commonly present along with this one.

Need help with a P0282 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 1-800-701-6220.

P0382
trouble codes
Check Engine Light

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

SCHEDULE P0382 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

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

What Does It Mean When the Dashboard Warning Lights Blink?
A blinking car warning light can indicate different problems with your car. If your Check Engine Light flashes without stopping, get it checked out.
P0099 OBD-II Trouble Code: Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic
P0099 P0099 code definition Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic What the P0099 code means P0099 is the OBD-II generic code that indicates that the engine control module (ECM) has detected a fault in the intake air temperature sensor...
P0530 OBD-II Trouble Code: A/C Refrigerant Pressure Sensor Circuit Malfunction
P0530 means there is a malfunction with the A/C refrigerant sensor circuit often due to low refrigerant or excessive system pressure.

Related questions

Displacement on demand not working.

The 8 to 4 system will automatically default to 8 cylinders if there is any problem that the ECM determines through its programming that it should disable the system. If you are having problems with the oil pressure sensor, it...

I have a 2006volkswagen passat and was told that i needed my high pressure regulator pump replaced cause my car was not accelerati

If your vehicle's Check Engine Light, as well as Electronic Power Control - EPC - light are on, you should request a diagnostic to have the stored Trouble Codes read and evaluated. Diagnostics that follow up on the specific downloaded...

check engine light is on

Hi there. For the check engine light being on, to start, get a code reader and scan the codes to the computer to have a starting place with diagnosing your engine. The computer can store a lot of codes from...

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