How to Fix P0735 Code On Cummins? (Complete Solutions)

When it comes to diesel engines, Cummins is pretty much at the top of the game. Even when it comes to its vulnerabilities, Cummins will make sure to give you a clear picture of them through DTC codes.

The P0735 is a standard code primarily associated with issues in transmission control.  The code flashes when the car is unable to get into the 5th gear due to dirty fluid in the transmission.

If you want to fix this problem, then you are in the right place to find your solutions. In this article, we will be covering an in-depth analysis of the P0735 code for Cummins engines.

P0735 Code On Cummins

What Does P0735 Code Mean On Cummins?

The P0735 code is a relatively common DTC used to warn the fact that there might be corrupted fluids in the engine affecting the transmission of the vehicle.

Below, we have given you a breakdown of the code to better understand how exactly it works and what the code is actually entitled to.

  • P= Powertrain, the system of components that propels your car forward.
  • 0= A generic number referenced from SAE standards
  • 7= Refers to the transmission of the vehicle
  • 35= This is the problem specific index (In our case, it refers to the incorrect fluid ratio or corrupted fluid used in the system)

How Serious is The Code P0735 in Cummins?

The code on its own isn’t that big of an issue. However, depending on what exactly is causing the code to flash, the problem can either be a minor one or a major one that requires immediate attention.

Minor problems can cause the code to flash without a warning due to flukes. On the other hand, if there is any major problems the entire transmission could refuse to start the engine.

As such you should definitely contact a professional to help you out even if the flashes are a false call. After all there is no absolute guarantee that the codes are a fluke.

What Causes Code P0735 On Cummins?

Just like any other automobile issue, the P0735 has several root causes to surface along with the flashing code.

While it is impossible to find out all minuscule causes, we have compiled and listed some of the more common ones below.

  • Not enough fluid is required for transmission
  • The fluid used is corrupted or dirty.
  • Solenoid Failure
  • Issues with the clutch or torque
  • Valve body issue
  • Internal pressure imbalance
  • Failure in the transmission pump

How To Fix Code P0735 On Cummins?

If you are going to fix the code P0735, you can follow the following step-by-step procedure given below.

Before you begin, ensure you have all the required tools, including the extra components. Only when you make the appropriate repairs and replacements will the transmission problem be resolved.

Step 1: Diagnosis

The first step is to diagnose the problem so that you can find out the root cause of it. You can do this by observing both hydraulic and electrical systems in your vehicle.

Additionally, you can also check on the solenoid and torque since the P0735 codes are usually caused by a faulty solenoid or malfunctioning torque.

Step 2: Change The Transmission Fluid

Once you’re done with the diagnosis, make sure to change the fluid that is used in the transmission. Contaminations not only cause the code P0735 to flash, but they can also cause more problems with the engine.

Step 3: Repair Wirings And Connectors

You can look for torn wires, damaged connectors, and transmission control. Once located, make sure to patch them. If it is impossible to patch them, you can replace them with new ones.

Step 4: Replace the transmission components

Use your power tools to open the damaged transmission components and replace them with a new one. Once replaced, the modules should work as well as new.

Other Symptoms Of Getting P0735 Code On Cummins

There are several symptoms that are associated with the P0735 code. While some of the symptoms are harmless, most aren’t.

Below, we have pointed out some of the more common symptoms. You might find out that you could have already experienced one or more of them in the past from your Cummins.

  • Flashing Engine Light
  • The engine refuses to power up
  • The 5th gear doesn’t work
  • The shift pattern is very inconsistent
  • Engine Performance deteriorated
  • Greater consumption of fuel than normal

How Much Does It Cost To Fix P0735 Code On Cummins?

It is impossible to give the exact amount of money that you will be paying for the repair. However, if we are going to make an estimation, then there are two categories that we will need to consider.

First comes the cost of the extra parts or components that you will be replacing. While there is no fixed cost to this, expect to pay around 500-600 USD for the transmission components.

Additionally, if you are going to hire a mechanic for the job, you will need to pay an hourly labor charge. This typically ranges from 75-150 USD, depending on what amount the mechanic decides to charge.

Can You Drive Your Cummins With Code P0735?

Yes, you can indeed drive your car as long as the cause of the code isn’t anything significant.

However, if the problem is something crucial with the standard driving of your vehicle, we would say that you shouldn’t drive. Various dangers and inefficient performance by your Cummins engine make it not worth it.

If you still want to keep driving your car despite the code flashing, you can always contact the manufacturer and ask for his advice. He could give you a temporary remedy based on the damage the code signifies.


By now, you should have received a clear idea about how exactly the code works and the solution for the issue.

A last piece of advice, do not attempt to resolve the code if you are an amateur when it comes to automobiles.

If you do not have high enough accomplishments as a mechanic, you are exposing yourself to several dangerous points in the vehicle. That is why we recommend you to a professional mechanic.

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