P0732 on Infiniti: How to Diagnose & Fix
Gear 3 Incorrect Ratio
1 Infiniti model · 1 documented issue
P0732 on Infiniti by model: symptoms, diagnosis and fix
The 7-speed automatic introduced for the 2009 G37 developed a widely reported drivability complaint: a hard clunk on the 2nd-to-1st downshift when coasting to a stop, gear hunting/searching under light throttle, delayed or harsh upshifts when cold, and in some cases stored incorrect-gear-ratio codes. The MyG37 '7-speed transmission reprogram' thread runs well past 170 pages of owner reports. Infiniti responded with a series of TCM/ECM reprogramming bulletins (owners cite ITB10-075 and later ITB12-027 revisions) rather than hardware replacement; only a minority of cars needed a torque converter or valve body.
Common Symptoms
- Hard clunk or jerk on the 2-1 downshift when stopping
- Transmission hunts between gears at light throttle
- Delayed or harsh shifts when cold
- Check engine light with gear-ratio codes
How to Fix
Have an Infiniti dealer apply the latest TCM/ECM reprogram (bulletin family ITB10-075 / ITB12-027 and later revisions) with CONSULT-III; many owners report the harsh 2-1 downshift and hunting are cured or greatly reduced. If ratio codes persist after the reflash, the dealer flow is to inspect fluid level/condition and replace the valve body or torque converter. No recall; reflash was covered under powertrain warranty and is a nominal-cost labor item out of warranty.
Sources for this issue (4)
P0732 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 P0732 mean on a Infiniti?
P0732 stands for "Gear 3 Incorrect Ratio." This code means the transmission control module detected that the gear ratio in 3rd gear does not match what it expects when the transmission is commanded into that gear. The computer compares input (turbine) speed to output shaft speed; if the math for 3rd gear is wrong, it sets this code. It usually points to internal slipping or a hydraulic/electronic control fault rather than a sensor reading error. On Infiniti it is documented across 1 model: G37.
What are the most common causes of P0732?
The most common causes of P0732 are: Low or dirty/degraded transmission fluid, Worn clutch packs or friction material in 3rd gear circuit, Faulty shift solenoid for 3rd gear, Valve body or pressure control problems, Internal mechanical wear or damage in the transmission, Clogged transmission filter restricting flow, Faulty input/output speed sensor giving skewed data. The specific cause varies by vehicle.
How much does it cost to fix P0732 on a Infiniti?
Repair costs vary widely with the root cause and Infiniti model; each issue on this page carries its own estimate where one is published.
Looking for P0732 on a different make?
View P0732 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.