P0732 on Acura: How to Diagnose & Fix
Gear 2 Incorrect Ratio
1 Acura model · 1 documented issue · 1 critical · $2,500-$4,500 repair
P0732 on Acura by model: symptoms, diagnosis and fix
1999 was the launch year of the 2nd-gen TL with the 3.2L J32A V6 and a 4-speed automatic (the 5-speed automatic arrived for 2000). This transmission family turned into one of the worst Acura defects of the early 2000s — torque converter failure, 3rd-gear clutch pack burn-up, blocked oil passages from debris, and complete failure became common. American Honda extended the transmission and torque converter warranties in 2003 (per TSB 02-027, which lists the 1999 TL). The first-generation (1996-1998) TL uses the older 4-speed automatic which is generally reliable; the 1999 TL's 4-speed is covered by the same bulletin as the later 5-speed. Every 1999 TL is a 2nd-gen car with the 4-speed automatic; there was no 1st-gen 1999 carryover.
Common Symptoms
- Flaring on 2nd-to-3rd or 3rd-to-4th upshifts
- Harsh 'thunk' downshifts when slowing
- Slipping in 3rd gear under load
- Transmission shudder at highway cruise
- Burnt-smell or dark transmission fluid
- Check engine light with P0700-series transmission codes
- Complete loss of forward drive (catastrophic stage)
How to Fix
If you own a 1999 TL with the 4-speed automatic and it's slipping, flaring on shifts, or showing harsh 1-2 / 2-3 changes: STOP driving aggressively immediately. The damage compounds quickly. Get a transmission specialist (not a dealer) to drop the pan and check for clutch material in the fluid. If found, the only durable fix is a rebuilt transmission ($2,500-4,000) — not a fluid change, not a solenoid swap. The original Honda warranty extension to 7/100k expired in 2006, so out-of-pocket cost is now on the owner. Many owners install an aftermarket transmission cooler with the rebuild — the original spec is undersized for the load and contributed to the failure pattern. Avoid 'flush' services — pressurized flushes on a worn transmission accelerate failure by dislodging clutch debris.
Owner tips & cautions
- WarningDo NOT 'flush' a worn 5AT. Pressurized flushes dislodge clutch debris from the case and accelerate the death of a struggling transmission. Drop and fill with manual fluid changes only.
- TipAlways add an aftermarket transmission cooler with any rebuild. The factory cooler is undersized for this transmission's load and was a contributing factor to the original failure pattern.
- TipWhen shopping a 1999 TL used, check the build date and transmission serial number. Cars built before the mid-year 2nd-gen launch have the older 4-speed and are far more reliable.
Sources for this issue (4)
- Acura TL Transmission Problems & Overview — Transmission Repair Cost Guidemedia
- Acura TL Transmission Slipping: Causes + How to Fix — Drivetrain Resourcemedia
- Wikipedia — Acura TL (1999 4-speed automatic; 5-speed from 2000)other
- Acura TSB 02-027 — Warranty extension, 3.2TL and 3.2CL automatic transmissiontsb
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 Acura?
P0732 stands for "Gear 2 Incorrect Ratio." This code means the transmission control module detected that the gear ratio in 2nd 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 2nd 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 Acura it is documented across 1 model: TL.
What are the most common causes of P0732?
The most common causes of P0732 are: Low or dirty/degraded transmission fluid, Worn or slipping friction element (clutch or band) that holds 2nd gear, Faulty shift solenoid, 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 Acura?
Published repair estimates on Acura range from $2,500 to $4,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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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.