Gear 3 Incorrect ratio
P0733 indicates the transmission is not achieving the correct gear ratio for 3rd gear, meaning the engine and transmission speeds don't match what the PCM expects. This code sets when the transmission control module detects a mismatch between input and output shaft speeds during 3rd gear operation.
What You Might Notice
- Check Engine Light illuminated
- Delayed or no shift into 3rd gear
- Transmission slipping or hunting between gears
- Reduced fuel economy
- Harsh or delayed gear engagement
Most Common Causes
- 1
Low or dirty transmission fluid
Insufficient fluid level or contaminated fluid reduces hydraulic pressure and friction needed for proper gear engagement. This is the most common cause and easiest to diagnose.
- 2
Internal transmission mechanical failure
Worn clutch packs, bands, or planetary gears in the transmission prevent 3rd gear from locking up correctly. This typically requires transmission rebuild or replacement.
- 3
Internal transmission blockage or sludge
Debris, varnish, or sludge buildup restricts hydraulic flow to 3rd gear clutches or servos. This limits pressure and prevents proper gear engagement.
- 4
Faulty transmission solenoid or wiring
A stuck, failed, or electrically disconnected solenoid prevents proper hydraulic shifting control to 3rd gear. This can be confirmed with electrical testing.
How to Diagnose It
- 1
Check Low or dirty transmission fluid — Insufficient fluid level or contaminated fluid reduces hydraulic pressure and friction needed for proper gear engagement. This is the most common cause and easiest to diagnose.
- 2
Check Internal transmission mechanical failure — Worn clutch packs, bands, or planetary gears in the transmission prevent 3rd gear from locking up correctly. This typically requires transmission rebuild or replacement.
- 3
Check Internal transmission blockage or sludge — Debris, varnish, or sludge buildup restricts hydraulic flow to 3rd gear clutches or servos. This limits pressure and prevents proper gear engagement.
- 4
Check Faulty transmission solenoid or wiring — A stuck, failed, or electrically disconnected solenoid prevents proper hydraulic shifting control to 3rd gear. This can be confirmed with electrical testing.
How to Fix It
- 1
Check and service transmission fluid
Inspect transmission fluid level, color, and condition. Top off or perform complete fluid and filter change if fluid is dark, burnt-smelling, or low. This resolves many P0733 cases.
- 2
Scan and clear fault codes
Use a diagnostic scanner to confirm P0733 and check for related transmission codes. Clear the code and test drive to see if it returns, which helps determine if it was a temporary issue.
- 3
Test transmission solenoid and wiring
Use a multimeter to test the 3rd gear solenoid resistance and check wiring for continuity and shorts. Replace any faulty solenoid or repair damaged wiring harness.
- 4
Rebuild or replace transmission
If fluid service and solenoid testing don't resolve the issue, internal transmission damage is likely present. The transmission will need professional rebuild or replacement to restore 3rd gear operation.
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