P1730 Ford Transmission RPM Increase Fault
The P1730 code is a Ford-specific diagnostic trouble code indicating that during the automatic transmission self-test, the transmission control module (TCM) detected that the engine RPM increase did not meet expected parameters when a rise in RPM was commanded. This test verifies the operation of the torque converter and transmission clutch by monitoring the relationship between engine speed and torque converter turbine speed when the torque converter clutch (TCC) solenoid is activated.
01. Most Common Causes
- Slipping or damaged torque converter
- Worn torque converter clutch
- Faulty torque converter clutch (TCC) solenoid
- Stuck or damaged torque converter control valve
- Low or degraded transmission fluid
- Insufficient transmission oil pump pressure
- Internal transmission mechanical problems
- Corroded or shorted wiring/connectors to the TCC solenoid
- Outdated or defective TCM software
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission slipping or shuddering
- Poor acceleration or hesitation
- Reduced fuel economy
- Transmission overheating
03. Step-by-Step Diagnosis
Scan for codes and record freeze frame data
Check transmission fluid level and condition
Inspect wiring and connectors to the TCC solenoid for damage or corrosion
Test TCC solenoid resistance and operation per manufacturer specs
Perform a torque converter stall test to check for slippage
Check transmission line pressure with a gauge
Update TCM software if available
If all else fails, inspect internal transmission components
1. Frequently Asked Questions
Is it safe to drive?▼
Driving with code P1730 is not recommended as it can cause further transmission damage, overheating, and unsafe driving conditions. Have the vehicle diagnosed and repaired promptly.
How much does it cost to fix?▼
Repair costs vary widely: a simple TCC solenoid replacement may cost $200-$400, while a torque converter replacement can range from $800-$1,500, and a full transmission rebuild could exceed $2,500.