P0730 on Dodge: How to Diagnose & Fix
Incorrect Gear Ratio
5 Dodge models · 5 documented issues · 4 critical · $500-$5,900 repair
P0730 on Dodge by model: symptoms, diagnosis and fix
The Jatco CVT has an inherent overheating design flaw, especially during extended highway driving. Owner reports of overheating shutdowns mostly fall between about 78,000 and 200,000 miles. ATF aeration compounds problems. Transmission shutdown can occur during highway driving in hot weather, leaving vehicle stranded.
Common Symptoms
- Transmission overheating warning light
- Transmission shutdown during highway driving
- Slipping and whining noise
- Shuddering during acceleration
- Complete loss of drive
How to Fix
Fill transmission to absolute lowest acceptable mark to reduce aeration. Check cooling fan relay (fan failure causes CVT overheating). CVT fluid change every 30,000 miles using Mopar CVTF+4 (NOT ATF+4). Consider adding external CVT cooler for highway driving.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 5191184AB CVTF+4 continuously variable transmission fluid
Required fluid for a correctly diagnosed JF011E/CVT service or level correction Fitment: 2007-2012 Caliber equipped with the Jatco CVT; CVTF+4 is not ATF+4 and must not be used in manual or conventional automatic transmissions $55.20 sho…
- Mopar 5191890AA transmission oil filter
Internal filter branch when the exact CVT service procedure calls for pan/filter service Fitment: OEM page lists the 2.0L/2.4L CVT application; verify the installed transmission, gasket/seal requirements and any external cooler-return fi…
- Mopar 68025160AA auxiliary transmission oil cooler
Replacement/retrofit-evaluation branch for the exact early Caliber application after a transmission specialist confirms the existing plumbing and required installation hardware Fitment: Live OEM fitment lists 2007-2010 Caliber 2.0L/2.4L …
- Mopar 68053218AA five-pin mini relay
Cooling-fan relay branch only after the vehicle fuse/relay map and an electrical test identify this serviceable relay in the fan-control circuit Fitment: Live OEM fitment lists 2008-2012 Caliber; the page identifies a generic mini relay …
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
The Marelli-designed C635 DDCT in 1.4L Turbo Darts has fundamental durability issues. The 2-4 position sensor in the hydraulic shift actuator fails, causing Service Transmission warnings, inability to shift, and jerky operation. Individual sensors not sold separately - entire actuator assembly must be replaced.
Common Symptoms
- Service Transmission warning on dash
- P1C9D/P1CC1 diagnostic codes
- Transmission won't shift into drive or reverse
- Jerky low-speed operation
- Shuddering during gear changes
How to Fix
Replace hydraulic shift actuator/valve body assembly (68445377AA). Wire harness 68240543AA may also need replacement. TCM reprogramming required after replacement. Expected DDCT lifespan is shorter than traditional automatics. Separately, check for open Safety Recall R42 (NHTSA 15V-542): on 2013-2015 1.4L DDCT Darts built Feb 24, 2012 to Jun 16, 2015, dealers replace the TCM and its mounting bracket free because cracked TCM solder joints can shift the transmission into Neutral without warning.
Sources for this issue (2)
The Mercedes-derived W5A580/NAG1 5-speed automatic in V8 Chargers suffers from water intrusion past the transmission oil fill tube/dipstick seal. Water contamination causes TCC to stick/slip, erratic shifting, and eventual internal damage. Separately, 2006-2009 police-package Chargers with a column shifter were recalled (08V583, 20,283 Charger and Magnum vehicles) because the gearshift cable can disengage from its steering-column bracket.
Common Symptoms
- Shudder during light acceleration in 3rd-5th gear
- Torque converter clutch sticking or slipping
- Erratic upshifts and downshifts
- Milky/foamy transmission fluid
How to Fix
Replace dipstick seal to prevent water intrusion. Flush transmission fluid with Mopar ATF+4 (MS-9602), the fluid Chrysler specifies for the NAG1 in these cars. Replace valve body if internal damage present.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Fuchs TITAN ATF 4134, MB-Approval 236.14
Approved-fluid branch for the NAG1/722.6 service after water contamination is addressed Fitment: Fuchs states backward compatibility with MB 236.12 and suitability for 722.6-type applications; confirm the applicable Charger service speci…
- Genuine Mopar NAG1 filter and pan-gasket pair
Convenient matched reseal/service branch after the ingress seal is corrected Fitment: NAG1 only; this is service hardware and not a cure for an already damaged valve body Live direct US product page when checked
Sources for this issue (2)
On early-production 2000 Dakotas with the 4.7L V8 and automatic transmission (built Dec 1999 - Mar 2000), ATF can be expelled from the fill tube during normal driving onto the hot exhaust system, creating a fire risk. NHTSA recall 00V-197 was issued for affected vehicles; dealers shorten the transmission vent hose and ensure adequate clearance.
Common Symptoms
- Transmission fluid expelled from fill tube
- Burning smell while driving
- Fluid on exhaust components
- In worst case: vehicle fire
How to Fix
Check NHTSA database for recall status. Contact Dodge dealer for free recall repair. Do not delay due to fire risk.
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 nine-speed automatic transmission on the Hornet GT exhibits hesitation and jerky behavior when accelerating from a stop. Reviewers attribute the low-speed hiccups to turbo lag combined with the transmission being unsure which gear to select.
Common Symptoms
- Hesitation from stop
- Jerky low-speed driving
- Delayed throttle response
- Lurching in parking lots
How to Fix
Ensure transmission software is updated to latest calibration at dealer. The TCM (Transmission Control Module) recalibration improves low-speed behavior. Avoid riding the brake during takeoff as it confuses the transmission logic.
Sources for this issue (2)
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 Dodge?
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 Dodge it is documented across 5 models: Caliber, Dart, Charger, Dakota, Hornet.
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 Dodge?
Published repair estimates on Dodge range from $500 to $5,900 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.
Looking for P0730 on a different make?
View P0730 across all makes →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.