P0736Generic code

P0736 Code: Reverse Incorrect Ratio

The P0736 code means that with reverse engaged, the ratio between the transmission input and output speeds is not what it should be, which tells the computer that something is slipping. Causes range from low fluid to worn clutches inside the transmission. Do not keep driving on it for long, because slipping builds heat and wear fast.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$100 to $4,000
Difficulty
Hard
System
Transmission
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P0736 code means

The transmission computer knows the gear ratio of every gear. It divides the speed of the input shaft (the turbine) by the speed of the output shaft and compares the result with the theoretical ratio. If the number does not match in reverse for a set amount of time, the computer concludes that an internal clutch or brake is slipping and stores the P0736 code.

Before you think about an internal repair, rule out the simple things: the fluid level and condition, a solenoid or valve that is not delivering enough pressure, and the speed sensors. A sensor with a bad signal creates a false ratio, so the transmission can look like it is slipping when it is not.

On any transmission code, the first check is the fluid. Check the level with the manufacturer procedure (often with the engine running and at a specific temperature). The fluid should be red or pink and should not smell burnt. Low or worn-out fluid causes slipping, harsh shifts and solenoid or ratio codes that go away once it is corrected.

If the slip is real and the fluid is burnt, the reverse gear clutches are probably worn. Driving on it makes the damage worse and fills the fluid with debris that harms the rest of the transmission. Read the P0700 guide to understand how transmission codes are read and why you need a scan tool that can talk to the transmission module, not just the engine computer.

P0736 code symptoms

  • Engine rpm climbs without the vehicle moving backward as it should.
  • Slipping or a late engagement when you shift into reverse.
  • Limp mode.
  • Burnt fluid smell.
  • Check engine light on.

Likely causes of the P0736 code

  1. Low fluid level. The cheapest cause, so check it before anything else.
  2. Degraded or wrong fluid. It loses its friction properties.
  3. Solenoid or pressure valve that does not apply enough pressure.
  4. Input or output speed sensor giving wrong readings.
  5. Worn reverse gear clutches or band. The friction material wears away and the gear slips.
  6. Internal pressure leak through seals or sealing rings.

How to diagnose the P0736 code step by step

  1. Check the fluid level and condition.
  2. Read the codes in the transmission module with a compatible scan tool.
  3. Compare input speed, output speed and engine speed while in reverse.
  4. Run a line pressure test if the transmission has a pressure port.
  5. Inspect the pan. Metal particles or friction material mean internal wear.

How to fix the P0736 code

  • Top off or change the fluid with the specified type.
  • Replace the solenoid or repair the valve body.
  • Replace the speed sensor if it gives wrong readings.
  • If the clutches are worn, have the transmission repaired.
  • Clear the adaptations and perform the relearn procedure.

Technical reference data

  • Ratio = input speed / output speed.
  • Normal fluid temperature: 70 to 95 °C (158 to 203 °F).
  • Reference values: check the manufacturer data for your vehicle.

Brand-specific notes

Some transmission families have known clutch problems, so it pays to search for manufacturer technical service bulletins for your exact model before you authorize a rebuild.

P0736 on GM

The GM 6T transmissions have known failures of specific clutches. Look up the manufacturer bulletins.

P0736 on Ford

The Ford 6R transmissions have known failures of specific clutches. Look up the manufacturer bulletins.

P0736 on Toyota

The Aisin transmissions used by Toyota have known failures of specific clutches. Look up the manufacturer bulletins.

P0736 on Nissan

The Jatco CVT units used by Nissan have known failures of specific clutches. Look up the manufacturer bulletins.

Frequently asked questions about P0736

Can I drive with a P0736 code?
With a P0736 code, only the bare minimum. Slipping creates heat and wear that damage the transmission quickly, so get it checked as soon as you can.
Can the fluid be the cause?
Yes. A low fluid level or degraded fluid causes slipping, and a fluid service sometimes clears the code.
Does the transmission have to be repaired?
Only if the slip is real and the clutches are damaged. Fluid, a solenoid or a speed sensor can be the whole problem.
How much does it cost to fix P0736?
It runs from about $100 for fluid or a solenoid up to $4,000 for a full transmission repair, depending on what the diagnosis finds.
What does the P0736 code mean?
It is a generic OBD2 code that means the gear ratio in reverse is wrong. The computer sees input and output speeds that do not match the expected ratio, which points to slipping.
Will a P0736 code clear itself?
Not if the slip is real. If a sensor glitch or low fluid caused it and you fix that, the light goes out after several good drive cycles, but worn clutches never fix themselves.

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