How to Fix P0868 Code On 6.7L Dodge Cummins? (Explained)

Diagnostic trouble codes are like breadcrumbs that tell you exactly where to go next to fix your problem. The trouble codes on your 6.7 Dodge Cummins will help you narrow down what’s wrong with your truck and get it going again as soon as possible.

The P0868 is a commonly-occurring code that indicates your 6.7 Dodge Cummins truck’s transmission fluid pressure is low. A few different things can cause this, but the most common is a leak in the transmission fluid line.

If you’re wondering what to do when this code appears, don’t worry; we’ve got you covered. In this article, we’ll go over the details of the P0868 code on 6.7 Dodge Cummins, its symptoms, causes, potential fixes, and related costs.

What Does P0868 Code Mean On 6.7L Dodge Cummins?

As mentioned earlier, the P0868 code on 6.7 Dodge Cummins trucks means that the vehicle is low on transmission fluid pressure. Here’s a breakdown of what the code has to do with this problem.

  • P = Powertrain, the system of components that propels your car forward (In our case, this is the transmission).
  • 0 = a generic number derived from the SAE standard
  • 8 = Transmission
  • 68 = Specific fault index (In our case, this denotes low fluid pressure)

When your transmission fluid pressure is low, your transmission isn’t getting the proper amount of hydraulic pressure to function correctly. In other words, it engages slower than it should during gear shifts.

How Serious Is P0868 Code On 6.7L Dodge Cummins?

In short, this issue is severe and needs to be fixed as soon as possible. A transmission that isn’t getting enough fluid pressure will have a hard time shifting gears, and if the problem is left unaddressed, it can cause significant damage to your transmission. And it can lead to requiring more expensive repairs, such as an entire transmission rebuild or replacement.

What Are The Symptoms Of The P0868 Code On 6.7L Dodge Cummins?

The most common symptom of the P0868 code on 6.7 Dodge Cummins is a delay in engagement when shifting gears. You’ll notice that it takes longer than usual for your truck to engage into gear when you put it into drive or reverse. Other potential symptoms include:

  • Transmission fluid dripping from the transmission
  • Gears slipping while driving
  • The check engine light is on
  • Smoke emissions from the transmission
  • Limp state of the transmission
  • Disengaged gear

What Causes P0868 Code On 6.7L Dodge Cummins?

P0868 codes on 6.7 Dodge Cummins can be caused by a variety of factors. However, the most common cause is a leak in the transmission fluid line. Other potential causes include:

  • Clogged transmission filter
  • Faulty transmission fluid pressure sensor
  • Damaged or broken transmission fluid pump
  • Dirty or worn down transmission fluid
  • Dripping transmission fluid
  • Faulty wiring
  • Engine overheating
  • Malfunctioning transmissions pump
  • Faulty transmission fluid pressure sensor
  • Failed transmission fluid temperature sensor (TFT)
  • Malfunctioning PCM

How To Fix P0868 Code On 6.7L Dodge Cummins?

Like most others, diagnostics of this error code require a basic OBD-II code reader. Once you have that, proceed with the following.

Step-1: Obtain the Freeze Frame Data

When your truck’s computer sets a code, it also saves what is called “freeze frame data.” This data shows the conditions that were present when the code was set. This data can be crucial in diagnosing the problem. Use the OBD-II code reader to retrieve this data.

Step-2: Check and Repair Leaks

The most common cause of the P0868 code on 6.7 Dodge Cummins is a leak in the transmission fluid line. Check all transmission fluid lines for leaks and repair them as necessary.

Step-3: Check the Temperature Sensor

If there aren’t any leaks, the next thing to check is the transmission fluid temperature sensor. This sensor is located on the transmission’s side, and it gives the computer information about the fluid’s temperature.

You should not look for more severe problems, such as a malfunctioning PCM or a faulty gearbox until you have gone through this procedure.

Step-4: Replace the Transmission Fluid

If the sensor is working correctly, the next thing to do is check the transmission fluid itself. If your transmission fluid is burnt out, it will need to be replaced. You can tell if your transmission fluid is burnt out by its color. If it’s brown or black, it needs to be replaced.

Step-5: Repair or Replace the Gearbox

In case your transmission fluid is clean, and your sensor is working, the gearbox is next to check. If the gears are damaged or worn out, they will need to be replaced.

In some cases, the entire gearbox will need to be replaced. However, only certain gears will need to be replaced in other cases. If you have any questions about this process or if you would like to have your truck’s transmission checked, please contact a certified mechanic.

Step-6: Check the Transmission Fluid Pump

If the gears are in good condition, the next thing to check is the transmission fluid pump. This pump is responsible for circulating the fluid through the transmission. If it is not working correctly, it will need to be replaced.

Step-7: Examine the Wirings and Couplings

Once you have replaced the transmission fluid pump, the next thing to do is check the wirings and couplings. If any of these are damaged, corroded, or broken, they will need to be replaced.

Step-8: Examine the TFT Sensor

Check the TFT sensor for a stable ground signal. Make sure both resistance readings are within limits. Check each reading against the manufacturer’s specifications. The TFT Sensor should be replaced if it does not meet the specifications.

How Much Does It Cost To Fix 6.7L Dodge Cummins P0868 Code?

It would cost considerably less than $100 to replace a 6.7 Dodge Cummins transmission fluid pressure sensor if you did it yourself. For most service companies, changing this sensor will require at least one hour of labor, which could add between $80 and $120 to the cost.

If you have a leaky transmission, replacing the seals and gaskets in your transmission pan will likely cost between $150-$500. However, if you also need to replace your torque converter seal or pump seal, this will add another $500-$1,000 to the price tag.

The cost of these services will vary depending on where you have your truck taken and how much work must be done.

Can You Drive Your 6.7L Dodge Cummins With Code P0868?

You could, but it’s never recommended. Driving your truck with this code can cause damage to the transmission and may eventually lead to complete failure.

If you must drive your truck while this code is present, do so carefully and avoid hard acceleration, braking, and turning. These activities can put stress on the transmission and may cause further damage. Besides, driving your truck with such a problem is extremely risky since you never know when the entire gearbox may fail.


If you get a P0868 trouble code and need to address the transmission fluid pressure issue, it’s not a bad idea to try the potential fixes above. But if it’s still giving you trouble, it’s best to take your truck to a mechanic or a dealership.

And if you do end up going in for a repair, remember that an inspection is always a good idea beforehand.

It’s possible that replacing the part will solve the problem and save you from making another trip back just to have another issue appear. And that way, you can get back on the road quickly and safely.

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