P0730 on Pontiac
Incorrect Gear Ratio
P0730 on Pontiac vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 Pontiac model — most commonly on Aztek. This code means the transmission computer detected that the actual gear ratio (calculated from input vs. output shaft speeds) does not match what it should be for the commanded gear. In other words, the transmission isn't delivering the correct gear, which often shows up as slipping, flaring RPM during shifts, or being stuck in the wrong gear. It can stem from internal mechanical wear, low or contaminated fluid, or faulty solenoids and sensors. The vehicle may shift harshly or enter limp mode. Typical repair costs on Pontiac range from $800 to $4,500, depending on the specific model and root cause.
Common Causes of P0730
- •Low or contaminated transmission fluid
- •Worn clutches or bands (internal slipping)
- •Faulty shift solenoids
- •Dirty or sticking valve body
- •Faulty input or output speed sensor
- •Internal hydraulic/line pressure problems
- •Torque converter problems
- •General high-mileage transmission wear
P0730 on Pontiac by Model
Pontiac Aztek(1 issue)
- 4T65-E Transmission Failure and Pressure Control Solenoid Erratic Shifting2001-2005
The Aztek's 4T65-E four-speed automatic suffers from pressure control (force motor) solenoid failure that drives line pressure to maximum, causing harsh shifting and accelerating internal wear; GM addressed related harsh-shift complaints in TSB 02-07-30-022B (faulty transaxle connectors, 2001-2004) and cold-weather reverse servo seal shrinkage in TSB 04-07-30-028. NHTSA complaints for the 2003 Aztek document gear failure, no-forward-movement, and shifter problems at an average of about 157,000 miles. Left unaddressed, the harsh-shift condition commonly progresses to slipping and loss of 3rd/4th gear requiring a rebuild or replacement.
Looking for P0730 on a different make?
View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Pontiac?▼
P0730 stands for "Incorrect Gear Ratio." This code means the transmission computer detected that the actual gear ratio (calculated from input vs. output shaft speeds) does not match what it should be for the commanded gear. In other words, the transmission isn't delivering the correct gear, which often shows up as slipping, flaring RPM during shifts, or being stuck in the wrong gear. It can stem from internal mechanical wear, low or contaminated fluid, or faulty solenoids and sensors. The vehicle may shift harshly or enter limp mode. On Pontiac specifically, this code is documented across 1 model.
What causes P0730 on Pontiac vehicles?▼
Common causes on Pontiac: Low or contaminated transmission fluid, Worn clutches or bands (internal slipping), Faulty shift solenoids, Dirty or sticking valve body, Faulty input or output speed sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0730 on a Pontiac?▼
Repair costs on Pontiac range from $800 to $4,500, depending on the specific model and root cause.
Which Pontiac models have P0730 documented?▼
Au7o has documented P0730 on 1 Pontiac model: Aztek.