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Code P0732. Incorrect Gear Ratio 2

The code P0732 indicates that the control module is having trouble determining how and when to shift into second gear in an automatic transmission.

To know what gear the transmission is supposed to be in, the ECU needs to know the engine RPM, throttle position, and transmission output speed at all times.

If you do not receive this information, activate the P0732 code and the Check Engine light on your dashboard.

Automatic Transmission Operation

P0732 OBDII fault code It sets in vehicles with an automatic transmission and has to do with a problem when shifting into second gear or driving in second gear.

The automatic transmission, which is controlled by the vehicle’s computer, uses various gear ratios to increase vehicle speed as engine power increases.

To check the proper operation of the transmission and its components, the powertrain control module (PCM), engine control module (ECM), or transmission control module (TCM) uses input from various sensors.

Typically, the engine speed is calculated by the transmission speed sensor (TSS), and the relationship between the transmission slip and torque converter is determined.

If the calculation is not within the expected range, the P0732 OBD2 code is set.

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What is Code P0732?

The code P0732 It is defined with the following tag: Incorrect gear ratio 2. This means that your transmission cannot shift into second gear, but it does not specify why.

This failure is accompanied by a series of symptoms in which the transmission does not work correctly.

In addition to this, transmission problems will affect the performance of the car, increase fuel consumption, and can affect other components of the same transmission.

When the code P0732 is set in the powertrain computer, it means that the computer is seeing a greater than specified RPM difference between the rotational speed of the input RPM sensor and the transmission output RPM sensor.

And specifically when the vehicle is in second gear or you want to change from second gear to another gear. This can occur during shifting or when driving at constant speeds.

Symptoms of Code P0732

The P0732 code is accompanied by a series of symptoms that affect the performance of the car.

  • The check engine light comes on.
  • Erratic shifting behavior.
  • It doesn’t get out of second gear.
  • The transmission slips.
  • Cannot engage second gear.
  • The engine stops unexpectedly.
  • Higher fuel consumption.
  • Poor engine performance.

Causes of Code P0732

The appearance of code P0732 It may be due to one or more of the following causes:

  • There is not enough transmission fluid.
  • Contaminated transmission fluid and filter.
  • Damaged wiring or connector.
  • Damaged transmission pump.
  • Defective torque converter clutch.
  • Solenoid failure.
  • Pressure passage blocked.
  • Problem with the valve body.
  • Problems with the VSS speed sensor.
  • TCM Module Failure.

How to Diagnose Code P0732?

Since a P0732 OBD2 fault code only indicates that there is a problem when shifting second gear, the ECU data must be analyzed with a scan tool to determine if there are other DTC codes that can tell you the source of the problem.

Then, you can check the condition of the ATF fluid and verify that it is not contaminated or dirty. You should also check to see if there is enough fluid in the system or if it is low.

If the ATF fluid is contaminated, you must extract all this oil and change it with new fluid. In this process you must also change the filter. But the most important thing about this step is to find out why the oil became contaminated and exactly what is contaminating it.

If you find a lot of metal shavings in the oil to be changed, this means that there is a lot of wear in the transmission, and this is not normal. An ATF oil contaminated with chips is a very poor indicator of the internal condition of the transmission.

The best thing in this case is to disassemble the transmission and thoroughly check the mechanical problem. You should leave this in expert hands to carry out the diagnosis and complete repair.

Components that fail, such as a solenoid or torque converter clutch, will have a separate code stored in the ECU. You can also perform a torque converter lockup test to ensure that the TCC system is working properly.

How to Repair Code P0732?

The repair carried out to solve this code P0732, it will depend on what the diagnosis carried out shows. Common actions taken to resolve the code include the following:

  • Change ATF transmission fluid and filter. It is one of the most common and simplest solutions. You can do it in your own garage.
  • Repair or replace damaged wiring and/or connectors. It is also something you can do in your garage, taking the diagnosis result as a reference.
  • Repair or replace defective transmission or torque converter components. This is already a major repair and must be carried out in a specialized workshop.

When diagnosing a P0732 code, it is important to record the freeze frame information and then duplicate the code setting conditions with a test drive.

Pay close attention to engine load, throttle position, RPM, and road speed because a P0732 can be difficult to detect.

The RPM input speed should be monitored and compared to the RPM output speed on a smooth, flat surface after the vehicle has warmed up and the fuel system is in a closed loop.

Monitors how the second gear solenoid setting responds to a greater amount of acceleration. The solenoid associated with 2nd gear should remain in 2nd gear and the transmission should NOT slip.

Common Errors When Diagnosing Code P0732

Most of the time, a P0732 diagnostic trouble code can be triggered by dirty transmission fluid or a lack of transmission fluid.

Sometimes simple maintenance on the transmission will allow it to begin operating normally. This is not always the case, but proper maintenance can often prevent a P0732 code.

The worst mistake you can make is to disassemble the transmission and proceed to disassemble it to look for the fault, the cause being the oil level or a damaged cable.

Is Code P0732 Serious?

Yes, we can consider this code to be high severity. The transmission will not function properly, making it impossible to drive the car. It usually stays in one gear and can affect other transmission components.

We do not recommend that you drive in these conditions. Take your car for diagnosis immediately.


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Perform the part of the diagnosis that you can run in your garage without problems. For in-depth diagnosis and repair, you must take your car to a specialized workshop where they can disassemble the transmission and perform different tests and verifications to repair it.

The good news is that, in most cases, you don’t have to go that far. It will be enough to top up the ATF fluid level or change it if it is in poor condition.

Or if you’re even luckier, you can solve it by simply replacing a broken or damaged control system cable.

If you want to know other articles similar to Code P0732. Incorrect Gear Ratio 2 you can visit the category Fault Codes.


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