What Does P0732 Mean?
The TCM has detected that the actual gear ratio in 2nd gear does not match the expected ratio. The calculated ratio deviates beyond the allowable range when 2nd gear is commanded. The driver may notice a flare or slip during the 1-2 shift, the engine RPM rising without a corresponding increase in vehicle speed while in 2nd gear, or a harsh delayed 2nd gear engagement.
Common Causes
35%
Worn 2nd gear clutch pack or intermediate band with insufficient friction material
25%
Low or degraded transmission fluid causing insufficient 2nd gear clutch apply pressure
20%
Faulty 2nd gear apply solenoid or pressure control solenoid not delivering correct pressure
10%
Stuck or worn valve in the valve body affecting 2nd gear hydraulic circuit
10%
Inaccurate speed sensor reading causing false ratio calculation
Diagnostic Steps
1
Check transmission fluid level and condition — address any low fluid or contamination issues before further diagnosis.
2
Monitor ISS and OSS PIDs during the 1-2 upshift and while cruising in 2nd gear. Calculate the actual ratio and compare to the manufacturer's 2nd gear specification (typically 1.4–2.5:1).
3
Watch for RPM flare during the 1-2 shift in live data — a spike in engine RPM without corresponding speed increase confirms clutch slippage rather than a sensor issue.
4
Test the solenoids involved in 2nd gear apply — verify resistance, command operation via scan tool, and check for mechanical click and proper current draw.
5
Perform a line pressure test at the 2nd gear circuit tap. Low pressure confirms a hydraulic issue (solenoid or valve body); normal pressure with slipping confirms worn clutch material requiring overhaul.
Estimated Repair Cost
$150 - $3,500
Parts + labor, varies by vehicle and location
The TCM has detected that the actual gear ratio in 2nd gear does not match the expected ratio. The calculated ratio deviates beyond the allowable range when 2nd gear is commanded. The driver may notice a flare or slip during the 1-2 shift, the engine RPM rising without a corresponding increase in ve...
The most common cause of P0732 (Gear 2 Incorrect ratio) is: Worn 2nd gear clutch pack or intermediate band with insufficient friction material
Typical repair costs for P0732 range from $150 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
2nd gear slippage causes unpredictable acceleration behavior during low-speed driving. The condition will worsen over time as clutch material wears further. Drive at moderate speeds to a repair shop and avoid stop-and-go traffic where repeated 1-2 shifts occur.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0732 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission / Gear Ratio Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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