What Does P0735 Mean?
The TCM has detected that the actual gear ratio in 5th gear does not match the expected ratio. The calculated ratio from the input and output speed sensors deviates from the 5th gear specification. The driver may notice slipping at highway speeds, the engine revving higher than normal in 5th gear, or the transmission refusing to engage or maintain 5th gear.
Common Causes
35%
Worn 5th gear clutch pack with degraded friction material causing slippage
25%
Low or contaminated transmission fluid reducing clutch apply pressure in the 5th gear circuit
20%
Faulty shift solenoid or pressure control solenoid affecting 5th gear application
10%
Valve body wear or stuck valve in the 5th gear hydraulic circuit
10%
Speed sensor drift or failure causing incorrect ratio calculation
Diagnostic Steps
1
Check transmission fluid level and condition — correct any low fluid or contamination before proceeding.
2
During a highway road test at a steady 60+ MPH in 5th gear, monitor ISS and OSS PIDs. Calculate the actual gear ratio and compare to the manufacturer's 5th gear specification.
3
Observe the 4-5 shift transition in live data — look for RPM flare or prolonged slip during the shift event. A clean shift shows a quick, smooth RPM drop.
4
Test the shift solenoids responsible for 5th gear engagement. Measure resistance, command on/off operation, and verify proper current draw and mechanical click.
5
Perform a pressure test at the 5th gear clutch apply circuit if a test port is available. Low pressure points to a hydraulic issue; normal pressure with slipping confirms worn clutch material.
Estimated Repair Cost
$150 - $3,500
Parts + labor, varies by vehicle and location
The TCM has detected that the actual gear ratio in 5th gear does not match the expected ratio. The calculated ratio from the input and output speed sensors deviates from the 5th gear specification. The driver may notice slipping at highway speeds, the engine revving higher than normal in 5th gear, o...
The most common cause of P0735 (Gear 5 Incorrect ratio) is: Worn 5th gear clutch pack with degraded friction material causing slippage
Typical repair costs for P0735 range from $150 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
5th gear slippage primarily affects highway fuel economy and causes elevated engine RPM. The vehicle is generally safe to drive at lower speeds where 5th gear is not needed. Avoid sustained highway driving and have the transmission inspected before the condition worsens to affect other gears.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0735 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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