P0730 on Chrysler: How to Diagnose & Fix
Incorrect Gear Ratio
2 Chrysler models · 3 documented issues · 2 critical · $2,200-$8,000 repair
P0730 on Chrysler by model: symptoms, diagnosis and fix
In PHEV models, a short in an internal transmission wiring connector (or, on some vans, a rotor bearing installation defect) can shut the gas engine down unexpectedly while driving and send the vehicle into limp mode or cause it to lose motive power entirely. Recall 03A / NHTSA 23V010 was issued for this.
Common Symptoms
- Engine suddenly shuts off while driving
- Service Transmission warning message
- Vehicle goes into limp mode
- Loss of power while driving
- Transmission stuck in one gear
How to Fix
Contact dealer for Recall 03A / NHTSA 23V010. Dealers update the Power Inverter Module (PIM) software, plus the instrument cluster and powertrain control module software on 2017-2018 vans, free of charge. Vans that show the related warning messages get a transmission replacement under Warranty Extension XE1, which has no time or mileage limit.
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (1)
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 (for example TSB 21-022-16 for early 2017 vans and TSB 21-031-24 for 2024 vans). 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).
Call to confirm they can assess your vehicle and perform the stated work. Search results do not confirm qualification, eligibility or coverage.
Sources for this issue (2)
The 41TE (A604 Ultradrive) four-speed automatic used behind the 3.3L and 3.8L V6 in 1996-2007 Town & Country vans is the single most-reported failure on the nameplate. Clutch material and worn friction debris circulate in the fluid, plug the small feed passages in the valve body and pump, and starve the planetary gearsets of lubrication. The result is a burned front/rear clutch pack or a shattered planetary carrier. Owners commonly report the failure preceded by a stuttering or repeated 1-2 shift, delayed forward/reverse engagement with a double bump, and limp-in (second gear only). Aggravating factors documented on the owner forums include use of generic ATF instead of Chrysler ATF+4, a missed 30k-mile fluid service, and a weak/AC-ripple-producing alternator or a bad output shaft speed sensor signal confusing the TCM. This is the 4-speed unit and is a separate story from the later 62TE 6-speed used from 2007 on.
Common Symptoms
- Repeated stutter or flare on the 1-2 shift
- Delayed engagement into Drive or Reverse with a hard bump
- Stuck in second gear (limp-in mode)
- Whine or growl that changes with road speed
- Burnt-smelling, dark ATF with clutch material in the pan
- Speedometer drops out along with the shift fault
How to Fix
There is no recall. Confirmed hard-part failure requires a rebuilt or remanufactured 41TE with an updated valve body and upgraded clutch/planetary components; a fluid-and-filter service alone will not save a unit that is already slipping. Preventively, forum consensus is a drain-and-fill with genuine ATF+4 every 30,000 miles (a pressure flush on a neglected high-mileage unit is often what pushes it over the edge), plus verifying charging-system ripple and the OSS/ISS speed sensor signals before condemning the transmission - electrical faults mimic mechanical failure on this unit.
Sources for this issue (3)
P0730 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 P0730 mean on a Chrysler?
P0730 stands for "Incorrect Gear Ratio." This code means the transmission computer detected that the actual gear ratio (calculated from input vs. output shaft speeds) does not match what it should be for the commanded gear. In other words, the transmission isn't delivering the correct gear, which often shows up as slipping, flaring RPM during shifts, or being stuck in the wrong gear. It can stem from internal mechanical wear, low or contaminated fluid, or faulty solenoids and sensors. The vehicle may shift harshly or enter limp mode. On Chrysler it is documented across 2 models: Pacifica, Town & Country.
What are the most common causes of P0730?
The most common causes of P0730 are: Low or contaminated transmission fluid, Worn clutches or bands (internal slipping), Faulty shift solenoids, Dirty or sticking valve body, Faulty input or output speed sensor, Internal hydraulic/line pressure problems, Torque converter problems, General high-mileage transmission wear. The specific cause varies by vehicle.
How much does it cost to fix P0730 on a Chrysler?
Published repair estimates on Chrysler range from $2,200 to $8,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.