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P0730 Pontiac Code - Incorrect Gear Ratio

- Code Popularity: 4,907 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0730 Pontiac?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit
⚠ Does your Pontiac have Safety Recalls? → Check here

How to Fix the DTC P0730 Pontiac?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

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

There is a factory service bulletin for the following Pontiac models:
2000-2004 Pontiac Aztek
2000-2004 Pontiac Bonneville
2000-2004 Pontiac Grand Am
2000-2004 Pontiac Grand Prix
2000-2004 Pontiac Montana
2000-2004 Pontiac Sunfire
Pontiac Factory Service Bulletin OBDII Code P0730

Search for P0730 Pontiac Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0730 Pontiac code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

Code P0730 Pontiac Description

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.

OBDII Code P0730 Pontiac - Incorrect Gear Ratio - AutoCodes.com
P0730 Pontiac Code - Incorrect Gear Ratio

Need More Information on the Code?

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Code P0730 Pontiac comments

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