Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor

B: Engine speed signal from Engine Control Module (ECM)

C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction." property="og:description">

For Shop Owners

P0731 JEEP - Gear Ratio Error In First Gear

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

Possible causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit
What does this mean?

Tech notes

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.

There is a Factory Service Bulletin for the the following models:

2005-2006 (KJ) Liberty / Cherokee
2005-2006 (WK / WH) Grand Cherokee
2006 (XK) Commander


What does this mean?

When is the code detected?

The ECM has detected that the transmission input RPM does not match the transmission output RPM under known conditions

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Incorrect transmission shifting

P0731 JEEP Description

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor

B: Engine speed signal from Engine Control Module (ECM)

C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

OBDII Code P0731 Jeep - Gear Ratio Error In First Gear - itimaster.ru

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P0731 JEEP Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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