17055/P0671/001649 DTC Code

In the world of automotive diagnostics, trouble codes play a significant role in identifying and fixing issues within a vehicle. One such code that you may encounter is the 17055/P0671/001649 DTC code. In this article, we will delve deep into understanding this specific code, its meaning, possible causes, and potential solutions. So, let’s explore!

Understanding the 17055/P0671/001649 DTC Code

The 17055/P0671/001649 DTC code is a diagnostic trouble code that relates to the glow plug control circuit in a diesel engine. It indicates an issue with the glow plug module control circuit or a single glow plug. This code is commonly found in vehicles equipped with diesel engines, where glow plugs are responsible for assisting the engine in starting up, particularly during cold weather conditions.

Possible Causes of the 17055/P0671/001649 DTC Code

There can be several underlying causes for the occurrence of the 17055/P0671/001649 DTC code. To help diagnose the issue accurately, here are the most common causes:

  1. Faulty Glow Plug: A malfunctioning glow plug can trigger the code. Glow plugs may fail over time due to wear and tear or poor electrical connections.

  2. Glow Plug Control Module Issues: If the module responsible for regulating the glow plug function is faulty, it may lead to the appearance of the DTC code.

  3. Wiring or Connector Problems: Damaged or loose wiring connections, as well as corroded connectors, can disrupt the proper functioning of the glow plug control circuit, resulting in the trouble code.

  4. ECU or PCM Malfunction: In rare cases, a problem with the Engine Control Unit (ECU) or Powertrain Control Module (PCM) may be responsible for triggering the code.

Diagnosing and Resolving the 17055/P0671/001649 DTC Code

When faced with the 17055/P0671/001649 DTC code, it is essential to take a systematic approach to diagnose and resolve the issue. Here are some steps to consider:

Step 1: Visual Inspection and Physical Checks

Begin by performing a visual inspection of the relevant components, such as the glow plugs, wiring, and connectors. Look for signs of damage, loose connections, or corrosion. Ensure that all components are securely connected and intact.

Step 2: Testing the Glow Plugs

Using a digital multimeter, you can test the resistance of each glow plug individually. Compare the values obtained with the specifications provided by the vehicle manufacturer. Replace any glow plugs that show abnormal readings, as they may be the cause of the trouble code.

Step 3: Inspecting the Glow Plug Control Module

If the glow plugs themselves are all in working condition, the next step is to inspect the glow plug control module. Check for any visible signs of damage or overheating. Additionally, you can use a diagnostic scan tool to read the live data and retrieve fault codes from the module.

Step 4: Addressing Wiring and Connector Issues

Examine the wiring harness and connectors associated with the glow plug control circuit. Repair or replace any damaged or corroded wires, and ensure that all connections are tight and secure.

Step 5: Verifying ECU or PCM Functionality

If all other potential causes have been ruled out, it may be necessary to check the ECU or PCM for any faults. This should ideally be done by a qualified technician using specialized diagnostic equipment.

Frequently Asked Questions

Here are a few commonly asked questions related to the 17055/P0671/001649 DTC code:

Q1: Can I drive my vehicle with the 17055/P0671/001649 DTC code?

A1: It is generally recommended to avoid driving a vehicle with the glow plug circuit malfunctioning, especially in colder climates. It can lead to difficulty starting the engine and potentially cause other complications. It is advisable to address the issue promptly.

Q2: Can the 17055/P0671/001649 DTC code be cleared/reset without repairs?

A2: While clearing or resetting the code can temporarily remove the warning light, it does not fix the underlying problem. Ignoring the issue may result in decreased engine performance, decreased fuel efficiency, or potential damage in the long run. It is best to diagnose and fix the root cause.

Q3: Can a DIY enthusiast diagnose and fix the 17055/P0671/001649 DTC code?

A3: Diagnosing and resolving the glow plug circuit issue may require a certain level of automotive knowledge and specialized tools. It is generally recommended to seek the assistance of a qualified technician or a mechanic who has experience with diesel engines and diagnostics.


The 17055/P0671/001649 DTC code is associated with the glow plug control circuit in diesel engines. By understanding the potential causes and following proper diagnostic steps, you can adequately address the issue. Remember to prioritize professional help if needed to ensure a safe and accurate resolution.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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