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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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0730.
Exact Repair Workflows
Browse →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.
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 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.
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
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07