B1814 DTC Code: Explained and Resolved


In the world of automobiles, various diagnostic trouble codes (DTC) are used to identify and troubleshoot issues within a vehicle’s system. One such code is the B1814 DTC code. In this article, we will take a deep dive into understanding this specific code, its meaning, possible causes, and effective resolution methods. So, if you’ve encountered the B1814 DTC code in your vehicle, fret not, as we’ve got you covered with all the information you need.

Understanding the B1814 DTC Code

The B1814 DTC code refers to a fault or malfunction in the auxiliary transmission fluid pump relay circuit. This code is commonly found in vehicles equipped with automatic transmissions. The purpose of the auxiliary transmission fluid pump is to supply the transmission with hydraulic pressure even when the engine is not running, ensuring smooth gear shifting and preventing unnecessary wear and tear.

Possible Causes of the B1814 DTC Code

  1. Faulty relay: A malfunctioning auxiliary transmission fluid pump relay can trigger the B1814 DTC code. Relays may become faulty over time due to wear and tear, electrical issues, or other factors.

  2. Wiring issues: Damaged or loose wiring connections can disrupt the proper flow of electrical signals in the auxiliary transmission fluid pump circuit, leading to the B1814 trouble code.

  3. Faulty auxiliary transmission fluid pump: In some cases, the actual pump may be defective, causing the relay circuit to malfunction and triggering the B1814 DTC code.

  4. Electrical system problems: Issues with the vehicle’s electrical system, such as a drained battery or a faulty alternator, can also contribute to the appearance of this code.

Resolving the B1814 DTC Code

To effectively resolve the B1814 DTC code, you can follow these steps:

  1. Step 1: Diagnostic scan: Begin by conducting a diagnostic scan of your vehicle’s electronic control module (ECM) using a reliable OBD-II scanner. This will retrieve the specific code (B1814) along with any additional related codes. Note down all the codes for further reference.

  2. Step 2: Visual inspection: Inspect the auxiliary transmission fluid pump relay and its associated wiring for any visible signs of damage, such as frayed wires, loose connections, or corroded terminals. If you notice any issues, repair or replace the affected components as necessary.

Frequently Asked Questions (FAQs)

Here are some common questions related to the B1814 DTC code:

Q1: Can I still drive my vehicle with the B1814 DTC code? Yes, you can continue driving your vehicle with this code. However, it is important to note that prolonged driving with the code unresolved may lead to transmission issues and possible damage.

Q2: How much does it cost to resolve the B1814 DTC code? The overall cost of resolving the B1814 DTC code may vary depending on factors such as the specific cause, labor charges, and replacement parts (if required). It is best to consult a professional mechanic for an accurate estimate.

Q3: Can I fix the B1814 DTC code myself? While it is possible to fix the B1814 DTC code yourself, it is strongly recommended to seek assistance from a qualified mechanic or automotive technician, especially if you are not experienced in dealing with electrical components and systems.


In conclusion, the B1814 DTC code is associated with issues in the auxiliary transmission fluid pump relay circuit. Understanding the possible causes and following the appropriate resolution steps outlined in this article can help you effectively resolve this code. Remember to consult a professional if you are unsure or uncomfortable handling the repairs yourself.

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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