Freightliner OBD/OBD2 Codes – TroubleCodes.net (2024)

FAQs

What are the letters in the OBD2 trouble code? ›

OBD-II codes with the letter P indicate powertrain codes, while B is used for body, C for chassis, and U for network codes. For all four sets of these codes, the third character indicates where in the vehicle the system occurred.

It's possible to read these codes from a vehicle's memory banks by using an OBD code scanner or dongle. Any vehicle sold in the United States after 1996 will have the updated OBD-II codes, so if you're shopping for an OBD scanner it's likely you want the OBD-II version.

The only way to clear a PDTC is to fix the underlying problem with the vehicle that originally caused the PDTC and its corresponding DTC to set, and then allow the vehicle sufficient drive time to re-run the monitor that identified the problem in the first place.

If the car's computer ever encounters a problem, a fault code or Diagnostic Trouble Code (DTC), will be stored within the car's ECU memory. With a scanner plugged into the car's On-Board Diagnostics (OBD) port you can read the list of codes stored, and therefore find out what the problem is.

Diagnostic Trouble Code (DTCs) -- Trouble codes are how OBDII identifies and communicates to technicians where and what on-board problems exist. The first number in the DTC indicates whether the code is an SAE generic code (applies to all OBDII systems) or is specific to the vehicle manufacturer.

A code type (0 or 1) in OBD-II indicates whether the code is standardized (0) or vehicle manufacturer-specific (1). Standardized Code (0): These codes are universal and are the same across all vehicles. For instance, 'P0420' is a generic code that often points to a problem with the catalytic converter.

Simply place your key into the ignition and turn it on for 1-2 seconds, then turn it off for 1-2 seconds. Repeat this step three or four times. If the check engine light remains after the reset, you might still have a problem with your vehicle.

This process plays out over something called a "confirmed fault-free monitoring cycle." Once a repair is complete, the car or truck must drive at speeds of 25 mph or more for at least five minutes, idle for more than 30 seconds, and have its engine operational for a full 10 minutes.

How do I clear my ECU code? ›

Plug an OBD-II scanner into your vehicle's OBD port and reset it to clear the check engine light. Disconnecting and reconnecting your battery will restart your vehicle's computer and clear the light. Drive an older vehicle around for a few days after repairs. The light will go off on its own once the computer resets.

The diagnostic port is behind the driver's seat.

DiagnosticLink is a subscription-based application supporting Detroit EPA 07, EPA 10, GHG14, GHG17, GHG21, and Gen 5 engine platforms including Freightliner, Western Star, & Thomas Built Buses vehicle support.