P0730 on Volvo
Incorrect Gear Ratio
P0730 on Volvo vehicles indicates incorrect gear ratio. Au7o has documented this code across 2 Volvo models — most commonly on S60, XC90. 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. Typical repair costs on Volvo range from $300 to $6,000, depending on the specific model and root cause.
Common Causes of P0730
- •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
P0730 on Volvo by Model
Volvo S60(1 issue)
- AW55-50SN 5-Speed Automatic Transmission and TCM Failure2001-2009
P2-generation S60s use the Aisin-Warner AW55-50SN 5-speed automatic. Two related failures dominate owner reports: the transmission control module (TCM), which is mounted inside the transmission case and bathed in hot ATF, develops cracked solder joints and internal failures, and the transmission's clutch packs and valve body wear prematurely because Volvo originally specified the fluid as 'lifetime fill'. Symptoms usually begin as harsh or delayed 1-2 and 2-3 shifts, then progress to flare-ups, limp-home mode (locked in 3rd gear), and eventually loss of forward or reverse. Owners on CarComplaints report 'Transmission/TCU Failure' and 'Lost Forward And Reverse' on early cars, and NHTSA has 16+ automatic-transmission complaints on the 2001 alone.
Volvo XC90(1 issue)
- GM 4T65E Transmission Failure2003-2005
The 2003-2005 XC90 with the T6 engine uses a GM 4T65E transmission that is prone to failure. The transmission was designed for lower-torque applications and struggles with the T6's power. Overheating and internal component failure are common.
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View P0730 across all makes →Frequently Asked Questions
What does P0730 mean on Volvo?▼
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 Volvo specifically, this code is documented across 2 models.
What causes P0730 on Volvo vehicles?▼
Common causes on Volvo: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0730 on a Volvo?▼
Repair costs on Volvo range from $300 to $6,000, depending on the specific model and root cause.
Which Volvo models have P0730 documented?▼
Au7o has documented P0730 on 2 Volvo models: S60, XC90.