DTC Meaning: What is a DTC code?
Let’s start by explaining the DTC meaning first.
DTC stands for Diagnostic Trouble Codes.
A DTC code is a series of diagnostic trouble codes used by a vehicle’s onboard diagnostics (OBD) system to alert you when a vehicle experiences a malfunction. Different DTC codes represent specific problems in your vehicle.
When the vehicle’s OBD system detects a problem, it generates a specific DTC code and transmits the alert to the vehicle’s instrument panel as a warning light. In vehicles equipped with a telematics system, the alert can be delivered directly to the fleet. The system can be set up to deliver the alert right to the maintenance department.
These codes were created by the Society of Automotive Engineers (SAE) to help vehicles comply with emission regulations. SAE is now called SAE International, and it is the professional organization that develops standards for automotive engineers.
Standard fault code list
If a vehicle’s manufacture date is 1996 or newer, it will most likely be OBD-II compliant.
The vehicle’s electronic system performs self-diagnosis and reporting. Any time the system detects a problem, it records that problem as a code. That code is known as a (DTC) diagnostic trouble code.
How do DTC codes work?
Diagnostic Trouble Codes or OBD-II (in light-duty vehicles) or J1939 (in heavy-duty vehicles) trouble codes are codes that the vehicle’s OBD system uses to notify you about a problem. Each code corresponds to a fault detected in the vehicle. When the vehicle’s computer detects an issue that requires attention, it will activate the corresponding trouble code.
Diagnostic trouble codes you need to look for
KeepTruckin’s onboard diagnostics monitoring system may help you avoid costly repairs and reduce vehicle downtime. With real-time notification and a description of the fault code, the fleet manager can make the appropriate decision. That may be to drive to an outside shop or have the driver return to the carrier’s home base for repairs.
Having one person monitor incoming telematics from the entire fleet brings significant advantages. For instance, the data can be used to route drivers and assign loads to trucks that do not need service.
Over time, a company can learn how to prioritize data and look for trends. This allows the company to use preventive maintenance and extend the life of its fleet by optimizing the availability of the assets.
Types of DTC codes:
With the sheer number of generic and manufacturer-specific DTC codes that could appear on your vehicle, it can be difficult for anyone, even professional mechanics, to understand all the fault codes.
If you can’t fully understand your DTC codes even after reading your vehicle manufacturer’s manual, make sure to check with your mechanic instead of purchasing replacement parts for the component or system right away.
DTC codes can be categorized into two types:
Type 1: Critical codes
These are urgent DTC codes that can cause quick and severe damages to the vehicle.
DTC codes such as high engine temperatures and low coolant levels could mean that engine failure is imminent. With real-time vehicle diagnostics, fleet managers and technicians can act quickly. They can assess the severity, recommend appropriate action immediately, and locate the nearest service center to resolve the issue before it becomes a costly and critical situation.
Type 2: Non-critical codes
While these DTC fault codes do not need urgent solutions, they still require proper attention. This includes emissions-related faults that don’t lead to excessive pollution.
Non-critical codes include those that light up the Malfunction Indicator Lamp (MIL), also known as the Check Engine Light. Type two codes also store a freeze-frame that has failed consecutively after two driving cycles.
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