Engine-Codes - Buick - P0730 BUICK

P0730 BUICK Code - Incorrect Gear Ratio

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

|P0730 BUICK code possible causes

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit

|How is the P0730 BUICK code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P0730 BUICK code tech notes

There is a factory service bulletin for the following Buick models:
2000-2004 Buick Century
2000-2004 Buick LeSabre
2000-2004 Buick Park Avenue
2000-2004 Buick Regal
2003-2004 Buick Rendezvous
Buick Factory Service Bulletin OBDII Code P0730

|What is the cost to diagnose the P0730 BUICK code

Labor: 1.0

The cost to diagnose the P0730 BUICK code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P0730 BUICK code possible symptoms?

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

|What is P0730 BUICK code meaning?

This diagnosis monitors the actual gear position by checking the torque converter slip ratio calculated by the Transmission Control Module (TCM) as follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from the speed sensor (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 supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
The Diagnostic Trouble Code (DTC) will set when the TCM has detected that the transmission is trying to mechanically shift to a lower gear than intended.

|Need more information with the P0730 BUICK code?

Need more information on how to fix the P0730 BUICK code?
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|Need help with a P0730 BUICK code?

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