What is Freightliner code EEC 61? | Vehicles, Cars and Engines (2024)

When you’re behind the wheel of a Freightliner, seeing the error code EEC 61 is never a good mark.

Driving a truck over long distances requires a lot of work and hours. There is little room for error and little room for profit. For instance, a Freightliner code EEC 61 is an issue that necessitates immediate attention.

What is Freightliner code EEC 61? | Vehicles, Cars and Engines (1)

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What is the EEC 61 code on Freightliner?

The EEC 61 code represents an error on Freightliner that indicates an after-treatment regulator unit problem. Usually, the code indicates an electrical failure of the injector or a bad solenoid on the injector, but your mechanic should first check and fix the terminal crimp.

The engine utilizes this module as part of the after-treatment system. It will appear that your Check Locomotive light and your Repair light are on at a similar phase. The upkeep warning light seems like a yellow engine and should always be on. A fuel gauge indicator comprised of four green-sided figures indicates that the level of your DEF (Diesel Exhaust Fluid) tank is at its maximum capacity.

If your DEF tank is less than half full, an EEC61 error message will be displayed, but you should strive to keep it at least half full at all times. After a few minutes of driving, the indicator light should turn off after three key presses.

If you don’t put gas in it, the engine will slow down to 25 percent of its average speed; if you keep driving, it will slow down to five miles/ hour. This is only a scrap of information, and I hope the resolution isn’t too bad.

The DEF system will run a purge routine to clear the lines whenever the truck is turned off, and if it doesn’t detect any air stress, it will also set this.

Pulling it off is possible, provided you don’t run into the DEF problem I mentioned earlier. If you carry on to experience the issue, I recommend taking it to your neighborhood retailer. The consumer can determine with relative ease which possible causes are most likely to be at fault. After attempting to move my tandems for several minutes, a low air pressure note most likely rang in my ears; however, I got the leading light, so I’m going with DEF 3/4.

If there is a problem with the low air pressure, will the light go out after three keystrokes? In any event, I am incredibly grateful to you for your assistance.

Of course, the best way to avoid the need for repairs is to take preventative measures. If you have a reasonable maintenance schedule, you can spot complications before they become serious, which will help you avoid breakdowns. The owner’s manual that came with your vehicle provides information on how to perform routine maintenance on your vehicle and identify potential issues.

How to do a proper Freightliner inspection?

Before beginning any journey of significant length, you must perform the following inspections:

  • Make sure you check the amount of oil in your vehicle.
  • It is essential to check both the radiator and the overflow bottle. Always be on the lookout for the possibility of a leak!
  • If you have been parked the truck for a few days, you should inspect the fuel vent;
  • Please make sure the tires have the proper amount of air pressure in them, and
  • Checking the brakes regularly for signs of wear and tear, such as vibrations or squealing sounds, is essential to ensure they are in good working order.

Performing routine maintenance on a vehicle more frequently increases as the vehicle ages. Suppose the FMCSA begins to issue fines for violations of the Compliance, Safety, and Accountability (CSA) Act. In that case, this is a symbol that you should increase the frequency of vehicle maintenance checks.

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Robert Aksamit

Mechanical Engineer at Poduno LLC at Poduno LLC

Robert Aksamit is a mechanical engineer and automotive industry expert. Robert was born in Minnesota and worked in the US automotive industry for 25 years.

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What is Freightliner code EEC 61? | Vehicles, Cars and Engines (2024)


What is the code EEC 61 on a Freightliner engine? ›

This is an aftertreatment code. Make sure your DEF tank is at least half full. Make sure the truck doesn't get shut off with low air pressure or the lines can't purge. Try cycling the key on and off 3 times and see if the code remains.

What is EEC on a truck? ›

The Ford EEC or Electronic Engine Control is a series of ECU (or Engine Control Unit) that was designed and built by Ford Motor Company.

What is EEC 61 3364 fail 2 FMI? ›

SPN 3364 Fail 2 is telling you that your Diesel Exhaust Fluid (DEF) has a quality issue, or at least that is what the ACM thinks. There are test strips available to test for DEF contamination. Also your DEF pressure sensors, lines DEF nozzle should be checked.

What is the code 61 on a Peterbilt engine? ›

Fault Code 61 indicates a failure with the circuit controlling the Rail Motor and the side-to-side movement of the X-Y Shift Finger. Read below to learn how to test, clear and fix fault code errors for your Freightliner, Mack, Peterbilt, Kenworth, Volvo, International, and heavy-duty truck and equipment.

What is flash code 62 on Freightliner? ›

Flash Code 62 may also indicate that the function assigned to the Auxiliary Output #1, #2, #5, #6, #7 or #8 circuit output is open, shorted to ground. This diagnostic condition is detected when the Auxiliary Output #"X" function is OFF and the DDEC III ECM measures a low voltage on the circuit output.

What is SPN code 51? ›


This diagnostic is typically Intake Throttle Position Deviation Error. This code sets when the intake throttle valve position has a 30% deviation from the position commanded by the Motor Control Module (MCM) when the engine coolant temperature is above 60°C (140°F).

What is an EEC engine? ›

Electronic Ignition & Engine Control

The EEC keeps your engine running at peak efficiency for your operational environment by evaluating input from engine and environment sensors hundreds of times per second. Those same sensors can provide valuable input as to the health of your powerplant.

What does ECC stand for in a truck? ›

A system used to regulate the temperature and humidity of a vehicle's cabin.

Are ECU and EEC the same? ›

Definition. FADEC is a system consisting of a digital computer, called an electronic engine controller (EEC) or engine control unit (ECU), and its related accessories that control all aspects of aircraft engine performance.

What does the DEF quality sensor do? ›

The quality sensor alerts the user if the solution deviates from the acceptable concentration range or if there are any contaminants present in the DEF tank.

How do I clear my Obdii error 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.

Which FMI code represents abnormal update rate? ›

A common data failure is FMI 9 for an abnormal update rate or FMI 10 for an abnormal rate of change. An FMI 9 failure code is an issue with the CAN communication where data is not being sent and received in a timely way by the engine computer.

How to fix eec 61 code? ›

If your DEF got low, it will throw a EEC61, but you need to fill the DEF tank 1/2 full or more. After you drive awhile, after 3 key cycles that light should go off. IF THIS IS THE PROBLEM. If you do not fill it up, the Engine will Derate to 25%, then if you continue to drive, it will derate you to 5 miles per hour.

What is 61 1 car code? ›

61-1 and 62-1 are common codes in Hondas. They usually happen during cranking with a weak battery. They are typically permanent codes and don't cause a check engine light.

What is the code for transmission failure? ›

The P0700 code indicates a problem with the transmission. It should not be ignored, because there can be serious drivability problems now and in the future. The technician should check for all codes present to accurately diagnose the problem.

What is transmission code 21 on Freightliner? ›

Fault Code 21 indicates a problem with the Auto-Neutral Park Brake Switch circuit.

What is Freightliner code SPN 521052 FMI 31? ›

SPN 521052/FMI 31

Description This Code Sets When SPN 521050/FMI 31 has been Present for One Hour of Idle Time, the Vehicle has been Restarted or Six Gallons of Fuel has been Used.

What is Freightliner code spn 879 FMI 6? ›

SPN 879 or 881 FMI 6 Active Fault Codes. SPN 879 FMI 6 Fault Code in Service Literature described as Front Left Turn Lamp - Current above expected value, and is associated with CHM C3-N pin.

What is code cel 74 on a freightliner? ›

Fault Code 74 sets due to the engine failing to respond to torque or speed requests sent by the TECU. Possible causes for this fault are due to OEM issues and cannot be caused by the transmission wiring or TECU.

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