P0730 Pontiac Code - Incorrect Gear Ratio
Quick Answer
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. Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0730 Pontiac indicates Incorrect Gear Ratio.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0730 Pontiac Description
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.
What are the Possible Causes of the DTC P0730 Pontiac?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0730 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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
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. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0730 Pontiac Code
1. What does the OBDII code P0730 mean on a Pontiac?
P0730 indicates that the transmission is experiencing an incorrect gear ratio, meaning the gear selected doesn’t match the expected RPM range.
2. What are the common symptoms of code P0730 in a Pontiac?
Symptoms may include slipping transmission, poor acceleration, harsh shifting, decreased fuel efficiency, and the Check Engine Light turning on.
3. What causes the P0730 code on a Pontiac?
Common causes include low transmission fluid, worn transmission components, damaged solenoids, or incorrect input/output sensor readings.
4. Can low transmission fluid trigger the P0730 code?
Yes, insufficient fluid can lead to improper gear engagement and cause the incorrect gear ratio error.
5. How do you diagnose the P0730 code on a Pontiac?
Diagnosis involves checking transmission fluid levels, inspecting wiring and solenoids, scanning for additional codes, and testing sensors and internal transmission components.
6. Is it safe to drive a Pontiac with the P0730 code?
Driving with this code can cause further transmission damage. It’s best to address the issue promptly to avoid costly repairs.
7. How can you fix the P0730 code on a Pontiac?
Repairs may include replacing the transmission fluid, fixing damaged wiring, replacing faulty solenoids, or rebuilding the transmission if internal damage is found.
8. Can a faulty transmission control module cause the P0730 code?
Yes, a malfunctioning transmission control module can send incorrect signals, leading to gear ratio errors.
9. How much does it cost to repair the P0730 code on a Pontiac?
Costs vary depending on the issue, ranging from $100 for fluid replacement to several thousand dollars for a transmission rebuild.
10. Can P0730 be related to other transmission codes on a Pontiac?
Yes, P0730 may appear alongside other transmission-related codes like solenoid or sensor failures, which can help pinpoint the root cause.
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