P0730 on RAM
Incorrect Gear Ratio
P0730 on RAM vehicles indicates incorrect gear ratio. Au7o has documented this code across 1 RAM model — most commonly on 1500. 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 RAM range from $300 to $3,500, 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 RAM by Model
RAM 1500(1 issue)
- ZF 8-speed (8HP70/845RE/850RE) torque-converter shudder and harsh shifting2013-2023
RAM 1500s with the ZF-based 8-speed automatic (TorqueFlite 845RE / 850RE, 8HP70/8HP75) commonly develop torque-converter clutch shudder. It feels like a slight-to-heavy vibration or 'driving over rumble strips' at part throttle and light acceleration, typically 15-50 mph as the converter approaches lock-up. Owners frequently report it around the 70,000-80,000 mile range, often tied to degraded fluid friction-modifier and/or worn/glazed torque-converter clutch material. Severe cases drop into limp mode (locked in 3rd gear with a CEL). Harsh 1-2/2-3 upshifts are also reported and are often resolved by a TCM software reflash.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on RAM?▼
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 RAM specifically, this code is documented across 1 model.
What causes P0730 on RAM vehicles?▼
Common causes on RAM: 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 RAM?▼
Repair costs on RAM range from $300 to $3,500, depending on the specific model and root cause.
Which RAM models have P0730 documented?▼
Au7o has documented P0730 on 1 RAM model: 1500.