P0380: OBD-2 error code interpretation and solutions

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Vehicle engine and/or automatic transmission

Code: P0380 - Glow plugs, circuit A – malfunction

Car brands such as Toyota, Renault, Kia, Skoda, Nissan, Hyundai, Volkswagen, Ford, Mercedes Benz, BMW, and others may display this error. This identification code is typical for issues related to the transmission. The glow plug is activated when starting a cold diesel engine, and the powertrain control module (PCM) uses coolant temperature data for this process. The glow plug heats up to a red glow for a short period to raise the temperature in the cylinder, facilitating the ignition of diesel fuel. If there is an interruption in the glow plug or its circuit, this fault code will be logged. Some diesel engines also use glow plugs after startup to reduce white smoke and engine noise during operation.

Causes of OBD P0380

The causes of the P0380 fault may manifest in the following ways:

Glow plug or "Wait to Start" indicator stays on for an extended period: When starting the vehicle, the glow plug may stay on longer than usual, or the "Wait to Start" indicator may remain illuminated even after the engine has started. This could indicate a problem with the glow plugs or their controller.
Malfunction Indicator Light (MIL) is illuminated: This means that a specific warning light may appear on the vehicle’s dashboard, alerting the driver to a fault in the glow plug system.
Difficulty starting, especially in cold weather: Engine startup may be challenging, particularly in low temperatures when more time is needed to preheat the glow plugs. This could point to an issue with the glow plugs or their control system.

These signs may be the first indicators that the glow plug system and its electrical components need to be checked for faults or damage.

Symptoms of P0380 Error

If the P0380 code is triggered, you can expect the following symptoms:

Faulty relay controlling the glow plug power.
Issues with the glow plug’s conductivity (e.g., open circuit, shorted to ground, etc.).
Problems with the glow plug control module.
Damage or failure of the glow plug itself.
Blown fuse responsible for powering the glow plug.

These potential causes require careful inspection and diagnostics to identify the specific fault and take the necessary corrective actions.

How to Diagnose DTC P0380?

Carefully consider troubleshooting options if other OBD error codes are found on the scanner.
Inspect the relay responsible for the glow plug operation and ensure it is functioning properly.
Check the fuses for proper operation, and replace them if necessary to rule out a potential cause of the issue.
Disconnect the glow plugs to measure their resistance using a DVOM. Also, check that the wiring connector is receiving proper power and ground. If needed, connect the glow plugs to the wiring harness and apply 12 volts, grounding the casing for 2-3 seconds. A bright red glow indicates the glow plugs are functioning correctly. A dim or red glow may indicate a fault.
Visually inspect the glow plugs, their wiring, and connectors for any external damage, bent or loose mounts, and signs of corrosion. Perform necessary repairs if needed.
Use a digital voltmeter (DVOM) to measure the resistance of the wiring harness connector and compare it to the manufacturer’s specifications.

What Repairs Can Fix the P0380 Fault Code?

Fixing the P0380 issue can be challenging, especially if you don't have the necessary tools and expertise to check the glow plugs, control module, relay, and wiring harness. In most cases, it's better to leave the job to professionals who have the relevant knowledge and experience.

For those with technical skills who want to inspect and replace the glow plugs and related components themselves, using the appropriate repair manual for the specific vehicle make can be helpful.

Conclusion

The P0380 fault code is typical for transmission issues in diesel engines. The glow plug is used to facilitate the ignition of diesel fuel during the startup of a cold engine. Some diesel engines also use glow plugs after startup to reduce white smoke emissions and noise. To fix this error, it is recommended to consult with service specialists.

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OBD P0380 code analysis and solutions

The page presents a detailed analysis of code P0380 for Opel, Renault, VW (Volkswagen), Ford, Peugeot, Mitsubishi, Skoda, BMW, Citroën, Toyota, Lada, Honda, Kia, and other models to analyze potential reasons and solutions related to OBD2 errors, with main attention on the issue. We provide engineering documentation and approaches for diagnostics to identify and find a solution effectively. Our resource is designed to be a comprehensive source of information on OBD 2 errors, providing you with the necessary tools for successful repair and maintenance of your automobile. If during the repair of OBD 2 errors you need to purchase parts, don’t forget to visit Avtopro!