P0730 on Cadillac: How to Diagnose & Fix
Incorrect Gear Ratio
1 Cadillac model · 1 documented issue · 1 critical
P0730 on Cadillac by model: symptoms, diagnosis and fix
Certain 2020-2021 Cadillac CT5 vehicles equipped with a 10-speed transmission can develop internal transmission damage that may cause the wheels to lock while driving.
Common Symptoms
- Open safety recall
- Unexpected wheel lock-up risk
How to Fix
Check the VIN and campaign status. Cadillac dealers install transmission-control-module monitoring software under recall N242480630; follow the campaign instructions if the software detects damage.
Sources for this issue (1)
P0730 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0730 mean on a Cadillac?
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 Cadillac it is documented across 1 model: CT5.
What are the most common causes of P0730?
The most common causes of P0730 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0730 on a Cadillac?
Repair costs vary widely with the root cause and Cadillac model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.