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2004 6.6 chevy silverado p0380 glow plug/heater circuit a

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SOURCE: engine check light on, code P0380, glow plug

first check glow plugs resistance values, sorry but i cannot tell you what they are supposed to be at offhand.

if the values are correct then you may need to replace the wiring harness which connects to the glow plugs.

more likely to be the plugs themselves though

Posted on Oct 06, 2009

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What are these codes


P0380 - Glow Plug/Heater Circuit 'A' Malfunction https://www.autocodes.com/p0380.html

P0483 - Cooling Fan Rationality Check Malfunction https://www.autocodes.com/p0483.html

Dec 31, 2016 | 2003 Chrysler PT Cruiser

1 Answer

I have a 2000 jetta TDI 1.9L. The glow plug light is flashing off and on and the car is running terribly. Code is reading P0380/glow plug monitor circuit. what do I need to do to fix the problem?


the code is for the Glo-plugs circuit A --malfunction=== causes wiring--glow plug relay--fuse-- glow plugs---ECM. Check the relay and the fuse

Oct 31, 2013 | 2000 Volkswagen Jetta TDI

1 Answer

Engine code p0380


EOBD II Error Code: P0380
Fault Location:
Glow Plug/Heater Circuit Malfunction
Possible Cause:
1.No Pre-Glow Period.
2.Poor Cold Starting.
3.Wiring harness.
4. Glow plug relay.
6. Fuse.
7. Glow plugs.
8. Engine control module (ECM).
Possible Solutions:
Check Glow Plug Wiring.
Check Glow Plug(s).

Mar 19, 2013 | 2005 Toyota Yaris Verso

1 Answer

Po380 missfire on idle


P0380 - Glow Plug/Heater Circuit 'A' Malfunction
Possible causes- Glow Plug harness is open or shorted
- Glow Plug circuit poor electrical connection
- Faulty Glow Plug

Oct 09, 2012 | 2005 Fiat Doblo 1.9

1 Answer

Will not start. code reader says glow plug heater circiut malfunction.


Hi Mike:
Glow plugs-on fed truck usually the controller-on cal.equipped truck usually glowplugs themselves.

We are assuming the you have some of this codes:
- P0380 Glow Plug/Heater Circuit A Malfunction
- P0381 Glow Plug/Heater Indicator Circuit Malfunction

I found this after searching this and other diesel sites for about a week glow plugs are covered on factory extended warranty-10 years or 200000 miles call GM @ 1-800-462-8782 have VIN# ready

Models: 2002 - 04 Chevrolet Silverado
2002 - 04 GMC Sierra
Equipped with 6.6L Diesel V8 (RPO LB7 - VIN 1) Engine; and California Emissions (YF5/NE1), or Clean Fuel Emissions (VCL)

Condition: Some customers of 2002 - 04 model year Chevrolet Silverado; and GMC Sierra trucks, equipped with a 6.6L diesel V8 (LB7) engine, and California emissions (YF5/NE1), or Clean Fuel Fleet emissions (VCL), may experience a condition where the engine glow plugs may fail. Failure of the glow plugs on these vehicles will cause illumination of the MIL. Also, depending on the ambient cold start conditions and the number of glow plugs failing open, some customers may also comment about hard starting, misfiring and white smoking after cold start.

Customer Notification: General Motors will notify customers of this special coverage on their vehicles (see copy of typical customer letter included with this bulletin - actual divisional letter may vary slightly).

Ask your local dealer.

Hope this helps; also keep in mind that your feedback is important and I will appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Dec 21, 2011 | 2003 Chevrolet Silverado 2500HD

1 Answer

The engine light went on so I check it with diagnostic and and gave me the code P0380 Gold plug/heater Circuit A.


CODE PO380 GLOW PLUGS CIRCUIT A MALFUNCTION. POSSIBLE CAUSES. GLOW PLUG RELAY CONTROL CIRCUIT IS OPEN SHORTED TO POWER OR GROUND CIRCUIT IS OPEN, GLOW PLUG RELAY IS STUCK IN POSITION CAUSING CONSTANT POWER, GLOW PLUG RELAY IS DAMAGED OR HAS FAILED, PCM HAS FAILED.

Feb 24, 2011 | Dodge Sprinter Cars & Trucks

1 Answer

PO380 and p1316 what do thies coads mean.


P0380 - Glow Plug/Heater Circuit "A" Malfunction
Bad glow plug. The glow plug system is used to assist in providing the heat required to begin combustion during cold engine temperatures. The glow plugs are heated before and during cranking, as well as initial engine operation. The engine control module (ECM) controls the glow plug ON times by monitoring coolant temperature and glow plug voltage. The California Glow Plug system has eight individual glow plug supply circuits between the controller and the glow plugs. If the feedback voltage from the controller to the ECM is not within range, DTC P0380 will set.

- The glow plugs are commanded OFF and the glow plug feedback is more than 2 volts. or
- The glow plugs are commanded on and the glow plug feedback is not between 5 volts and 6.2 volts.

Keep in mind that the "wait to start" light only comes on while the voltage is dropping in that circuit. This should only take 3-5 sec's. If it takes longer, refer to your "Likely problem" you listed above. That would be the Heater Module. If your glo plugs stay on, your batteries would be dead in no time. If any of your plugs go bad, they would each be listed on the reader per cyl 1-8. If you need to change the Module,


P1316 - Injector Circuit / IDM Codes Detected.
This code indicates that codes are stored in the IDM

Possible causes are as follows:
- Injector(s) or circuit(s)
- Open or shorted IDM enable circuit
- Open/short in EF circuit
- Open/short in FDCS circuit
- IDM relay
- IDM powering circuits
- Failed IDM
- Failed PCM

Check your Injector Driver Module wires, circuits 821 (Brown/Orange) and 818 (Grey/White) between the PCM and IDM. On the IDM side, the connector pin numbers are 17 for circuit 821, and pin 4 for circuit 818. You should check for high resistance in that circuit, short to ground, or open circuits. If wiring checks out good, you may need to replace your IDM. It's not uncommon for water intrusion into the module, due to its mounting location. Also check the engine wiring harness where it routes up over the driver side shock and/or driver side valve cover. That code is either a key-on/engine-off or a continuous memory code.


Hope this helps (remember to rate this answer).

Feb 04, 2011 | 1999 Ford F350 Regular Cab

2 Answers

Engine check light on, code P0380, glow plug circuit. What to check.


first check glow plugs resistance values, sorry but i cannot tell you what they are supposed to be at offhand.

if the values are correct then you may need to replace the wiring harness which connects to the glow plugs.

more likely to be the plugs themselves though

Oct 02, 2009 | 2000 Volkswagen Jetta TDI

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