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.
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
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.
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 on how to fix the P0730 Pontiac code? Get Access to Factory Service Manuals
Get the P0730 Pontiac code diagnosed by a professional: Find a repair shop in your area
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