P0730
High SeverityIncorrect Gear Ratio
Transmission System
P0730 — Instant Answer
Incorrect Gear Ratio
Severity: HIGH SEVERITY
Meaning: The TCM detects that the actual gear ratio does not match the commanded gear.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $50 - $3,000
Most common causes:
- 1. Low or burnt transmission fluid (35-45% of cases)
- 2. Worn clutch packs (10-25% of cases)
- 3. Faulty shift solenoid (10-25% of cases)
- 4. Internal transmission damage (10-25% of cases)
Symptoms
- ⚠️Transmission slipping
- ⚠️RPM flares during shifts
- ⚠️Harsh engagement
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0730
- 1Check transmission fluid level and condition
- 2If fluid is dark/burnt, service transmission
- 3Check for specific solenoid codes
- 4Transmission may need rebuild if fluid is OK
OEM Procedures for P0730
P0730 affects the Transmission. Found 1,512 OEM service manual procedures.
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 036 Installing replacement transmission (GS6-37BZ/DZ)
00 Complete Transmission - 23 00 037 Installing Replacement Transmission (GS6-53BZ/DZ)
00 Complete Transmission - 23 00 037 Installing Replacement Transmission (GS6-53BZ/DZ)
Showing 8 of 1,512 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0730 Incorrect Gear Ratio.
Transmission Fluid
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Transmission Filter
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Shift Solenoid
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Torque Converter
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OBD2 scanner
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Check SpecificationsBattery tester
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A weak battery can mimic alternator or starter problems.
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A meter is the cheapest way to rule out a bad circuit fast.
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0730.
OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti EX37 AWD V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repair Know...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti EX37 RWD V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repair Know...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Convertible V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repa...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Coupe V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repair Kno...
Exact Repair Workflows
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Open the exact repair flow most commonly associated with P0730 on this vehicle.
Open the exact repair flow most commonly associated with P0730 on this vehicle.
Open the exact repair flow most commonly associated with P0730 on this vehicle.
Open the exact repair flow most commonly associated with P0730 on this vehicle.
Open the exact repair flow most commonly associated with P0730 on this vehicle.
Related Symptoms
Browse →Slipping, flare, or delayed-shift complaints usually need fluid condition, hydraulic pressure, and internal wear checks before major replacement.
A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Exact Vehicle Hubs
Browse →Open the exact vehicle hub for a repair workflow commonly associated with P0730.
Open the exact vehicle hub for a repair workflow commonly associated with P0730.
Open the exact vehicle hub for a repair workflow commonly associated with P0730.
Open the exact vehicle hub grounded by OEM manual evidence related to P0730.
Open the exact vehicle hub grounded by OEM manual evidence related to P0730.
Open the exact vehicle hub grounded by OEM manual evidence related to P0730.
Related Codes
The TCM (Transmission Control Module) has detected a fault and sent a message to the ECM. This is a general indicator that transmission-specific codes are stored.
Fault in the torque converter clutch (TCC) solenoid circuit.
Frequently Asked Questions
- Is P0730 a death sentence for the transmission?
- Not necessarily — it could be as simple as low fluid. Check fluid first. If fluid is fresh and full, internal wear is more likely.
- How much does a transmission rebuild cost?
- Professional rebuild: $1,500-$3,500. Remanufactured transmission: $1,000-$2,500. Always check fluid first.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29