P0733 on Chrysler: How to Diagnose & Fix
Gear 4 Incorrect Ratio
1 Chrysler model · 1 documented issue
P0733 on Chrysler by model: symptoms, diagnosis and fix
The ZF 9HP 9-speed automatic transmission in the Pacifica exhibits harsh or jerky 3-4 shifts, shuddering during light throttle acceleration at 25-40 mph, and occasional hesitation when downshifting. The 9-speed has had multiple software calibration updates since launch, and the adaptive learning can become confused by varied driving patterns. Cold weather worsens the harsh shifting. The issue persists across multiple model years despite ongoing TSBs.
Common Symptoms
- Harsh or jerky 3-4 upshift
- Shudder during light acceleration at 25-40 mph
- Hesitation or hunting between gears on hills
- Transmission feels rough when cold
- Occasional delayed downshift when passing
How to Fix
Visit a dealer for the latest transmission control module (TCM) software update — Stellantis has released numerous calibration updates (most recent as of 2025 is TSB 21-013-24 or newer). After the update, the transmission needs a re-adaptation period of 500-1,000 miles of mixed driving. If harsh shifting persists, a transmission fluid drain and refill with Mopar ZF 9-speed fluid may help. In severe cases, valve body replacement resolves persistent harsh shifts ($1,000-$2,000).
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Sources for this issue (1)
P0733 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 P0733 mean on a Chrysler?
P0733 stands for "Gear 4 Incorrect Ratio." This code indicates the transmission control module found that the actual gear ratio in 4th gear is outside the acceptable range for that gear. It is detected by comparing transmission input speed against output speed while 4th gear is engaged. A mismatch typically signals the transmission is slipping in 4th gear or that a control/hydraulic fault is preventing proper engagement. On Chrysler it is documented across 1 model: Pacifica.
What are the most common causes of P0733?
The most common causes of P0733 are: Low or contaminated transmission fluid, Worn 4th-gear clutch packs or bands, Failing shift solenoid for 4th gear, Valve body or line pressure issues, Internal transmission mechanical wear, Restricted transmission filter, Faulty input or output speed sensor. The specific cause varies by vehicle.
How much does it cost to fix P0733 on a Chrysler?
Repair costs vary widely with the root cause and Chrysler model; each issue on this page carries its own estimate where one is published.
Looking for P0733 on a different make?
View P0733 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.