P0733 on 2026 Jeep Wrangler: Gear 3 Incorrect Ratio Causes and Fixes

What's Unique About the 2026-2026 Jeep WRANGLER

The Jeep Wrangler uses a ZF-derived 8-speed automatic transmission (like the 850RE) 🎬 Watch: Overview of the Jeep 8-speed automatic transmission which is common across many Stellantis (Jeep, Dodge, Ram, Chrysler) vehicles. This transmission has a well-documented weakness in the 'D' clutch assembly, often caused by a weak, stamped-steel backing plate that flexes and causes the clutch to burn up. In response, the manufacturer has issued multiple Technical Service Bulletins (TSBs) that identify this specific mechanical failure as the root cause for P0733 and provide a targeted repair procedure that avoids a full transmission replacement.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this vehicle.

Symptoms You May Notice 🎬 See: Common symptoms of a failing transmission clutch

• Check Engine Light is on
• Harsh or delayed shifting, particularly involving third gear
• Transmission slipping (engine RPMs rise without an increase in speed)
• Vehicle gets stuck in one gear (limp mode)
• Clunking noise when shifting, especially into Reverse on a cold start
• Inability to engage reverse gear, sometimes with a 'shift to park then desired gear' message
• Symptoms are worse when the vehicle is cold and may seem to resolve after restarting the engine

Most Likely Causes

1. Internal 'D' Clutch Failure 🔴 High Probability This is a well-documented issue confirmed by multiple manufacturer TSBs (S2621000003, 21-009-25, etc.) for this specific 8-speed transmission family. The failure is often related to a weak component within the clutch pack, such as a flexing backing plate.
   How to confirm: A technician will follow the diagnostic steps outlined in the relevant TSB, which includes verifying the presence of P0733, P1DA8-00, or P1D92-00 on a vehicle with over 7,000 miles. The key diagnostic step is to remove the valve body and perform an air leak test on the D-clutch hydraulic circuit to confirm the internal seal failure.
   Typical fix: Replace the D clutch assembly using the specific repair kit outlined by the manufacturer (TSB 21-009-25). This is an internal transmission repair that requires removing and partially disassembling the transmission. 🎬 Watch: 850RE transmission teardown to see internal components
   Est. part cost: $300-$700
2. Low or Degraded Transmission Fluid ⚪ Low Probability While this is a common cause for generic transmission issues, it is highly unlikely to be the root cause for P0733 on this platform. Instead, dark, burnt, or debris-filled fluid is a *symptom* of the D-clutch failure. A related TSB explicitly states that fluid color/condition is NOT an indicator of transmission health for this issue.
   How to confirm: Check the transmission fluid level and condition. The fluid should be at the correct level and not appear dark or burnt. However, clean fluid does not rule out the D-clutch failure.
   Typical fix: Perform a transmission fluid and filter service using the correct Mopar ZF 8&9 Speed ATF. If the fluid is very dirty, it's a strong indicator of the internal clutch failure, and a fluid change alone will not be a permanent fix.
   Est. part cost: $200-$400

Rare But Worth Checking

• Faulty Valve Body or Shift Solenoid: A failing solenoid or a stuck valve can cause hydraulic pressure issues leading to this code. However, it is far less common for P0733 on the Wrangler compared to the documented D-clutch failure.
• Faulty Transmission Control Module (TCM) or Software: While a software update can fix some transmission issues, TSBs for the P0733 code on this platform point to a mechanical failure, not a software glitch. A TCM software update is required *after* the mechanical repair is completed.

Diagnosis Steps

1. Verify the code with a quality OBD-II scanner and check for other related codes like P1DA8 and P1D92.
2. Check the transmission fluid level and condition. Dark or burnt-smelling fluid strongly suggests clutch material contamination.
3. Search for active Technical Service Bulletins (TSBs) for your vehicle's VIN. TSB 21-009-25 and its revisions are the primary documents for this issue.
4. Confirm the vehicle has more than 7,000 miles, as specified in the TSB as a condition for this repair.
5. If TSBs point to the D-clutch, the definitive diagnostic step is to remove the transmission pan and valve body to perform a clutch air pressure test on the D-clutch circuit. A failure confirms the internal leak.
6. Proceed with the D-clutch replacement as outlined in the TSBs, which is the most probable repair.
7. After the repair, perform the TCM Adaptation Procedure using a dealer-level scan tool.

Parts You'll Likely Need

• D Clutch Repair Kit (OEM #68676891AB (for 4x4 JL/JT/WD/WK) or 68603205AA) — This is the specific part kit identified by Jeep in TSBs to resolve the root mechanical failure causing code P0733. The part number may vary by specific model (Wrangler, Grand Cherokee, etc.).
  Trusted brands: Mopar
  OEM price range: $300-$700
• Mopar ZF 8&9 Speed Automatic Transmission Fluid (OEM #68218925AB) — The correct fluid must be used when servicing the transmission to prevent further damage. This repair requires draining and refilling approximately 8-10 quarts of fluid.
  Trusted brands: Mopar
  OEM price range: $25-$40 per quart
• Transmission Oil Pan and Filter Assembly — The filter is integrated into the pan. It must be replaced during the service to remove any contaminants from the failing clutch and ensure proper fluid filtration.
  Trusted brands: Mopar
  OEM price range: $150-$250
  Aftermarket price range: $100-$180

Related Codes That Often Appear With This One

• P1DA8-00 — Incorrect Gear Ratio Clutch A B or D Defective. This code is listed in the same TSBs as P0733 and points directly to the same internal D-clutch pack failure.
• P1D92-00 — Incorrect Gear Ratio - Clutch 4 Defective. This code is also listed in the TSBs related to the D-clutch failure, further confirming the diagnosis.
• P0700 — Transmission Control System Malfunction. This is a generic code indicating the TCM has stored a fault. It will almost always be present alongside a specific code like P0733.

Technical Service Bulletins (TSBs) & Recalls

• S2621000003 REV.A: Lists P0733 as a potential code for 2026 model year transmissions.
• 21-009-25 (Multiple Revisions): The primary TSB detailing the symptoms (P0733, P1DA8, P1D92), affected vehicles (Wrangler, Ram, Durango, etc.), and repair procedure for replacing the D-clutch.
• 9100534 Rev 1: States a repair is available for P0733 and transmission replacement is not required.
• 9100390 Rev 1: Mentions a D Clutch Repair Kit for P0733 and advises against transmission replacement.

Platform-Specific Known Issues

• TSB #S2621000003 REV.A specifically lists P0733 as a potential diagnostic code for the 8-speed transmissions used in 2026 models.
• TSB #21-009-25 REV. C (and subsequent revisions) is the core document defining the P0733-00 code and linking it to the D-clutch failure for vehicles with over 7,000 miles.
• TSB #9100534 Rev 1 and #9100390 Rev 1 explicitly state that for P0733, a repair is available and transmission replacement is NOT required.
• Owner complaints and forum discussions confirm that dealers, following corporate direction from Stellantis, are performing this specific internal repair instead of full transmission replacements. One owner reported the warranty repair cost was $2,000.

Mechanic-Grade Diagnostic Values

• Clutch Pack Air Pressure Test — expected: A slight 'thud' sound as the clutch applies, with no significant air leakage.. Failure: A large amount of air is heard escaping, indicating failed seals within the clutch pack.
• Transmission Fluid Temperature for Level Check — expected: Between 86°F and 122°F (30°C and 50°C).. Failure: Checking the fluid level when it is too cold or too hot will result in an inaccurate reading, which can lead to misdiagnosis.

Hidden / Shadow Codes Worth Checking

• P0733-00: The '-00' suffix is a Failure Type Code used by Stellantis. It specifies 'Component or System Failure'. Its presence alongside P1DA8-00 and P1D92-00 is the key indicator for the D-clutch failure described in TSB 21-009-25. (see via A professional-grade scanner like the dealer's wiTECH tool or equivalent will display these suffixes. Basic OBD-II readers may only show the generic P0733.)

Scan Tool Commands That Help

• wiTECH (or equivalent professional scanner): Adaptation Procedure — This procedure must be performed after the D-clutch mechanical repair is completed. It allows the TCM to learn the new clutch's engagement points and characteristics. TSB 21-009-25 allocates 1.0 hour of labor for this step.
• wiTECH (or equivalent professional scanner): View Transmission Fluid Temperature — This live data PID is critical for accurately checking the transmission fluid level, which must be done within a specific temperature window (typically 30°C-50°C).

Wiring & Ground Locations

• Main Chassis Grounds (Engine Bay) — On the passenger side of the engine bay, near the battery, there is a set of three ground studs on the inner fender. Another is located further forward toward the air box.. While P0733 is almost always a mechanical fault, ensuring the TCM and related sensors have a solid ground is a fundamental diagnostic step. Poor grounding can cause erratic sensor readings and module behavior.
• Transmission Main Connector (C127) — This is the main electrical connector going into the transmission case, connecting the vehicle harness to the internal lead frame, solenoids, and sensors.. Damage or corrosion at this connector could interrupt signals from the input/output speed sensors or power to the solenoids, potentially causing ratio codes. A visual inspection is warranted, though it's a low-probability cause for this specific code on this platform.

Real Owner Repair Stories

• jlwranglerforums.com user (2021 Jeep Wrangler Unlimited Rubicon (JLUR)) — Clunking noise when shifting into reverse, hard 3-4 shift, and eventually the Check Engine Light with code P1DA8-00 (a companion code to P0733).
  ❌ Tried (didn't work) The user took the vehicle directly to the dealer upon seeing the check engine light.
  ✅ What actually fixed it The dealer performed the repair outlined in TSB 21-009-25, which involves replacing the internal D-clutch pack. This resolved all symptoms.

OEM Part Supersession History

• Unknown/Previous Revisions → 68676891AB (4x4) / 68603205AA — The D-clutch repair kit part number has been updated through multiple TSB revisions. This often indicates improvements to the components to create a more durable repair and prevent repeat failures of the original weak design.
  Heads up: It is critical to use the latest part number specified in the most current version of TSB 21-009-25 for the specific vehicle application (Wrangler, Ram, etc.) to ensure the most robust and correct components are installed.