P0732 - Gear 2 Incorrect Ratio
The transmission control module (TCM) has detected that the gear ratio for 2nd gear is outside the expected range. This indicates internal transmission slippage or a mechanical failure, often due to worn clutch packs, valve body issues, or low fluid pressure. The code is set when the TCM compares input and output shaft speeds and finds a discrepancy for 2nd gear.
1. Symptoms You Will Notice
- Harsh or delayed shifting into 2nd gear
- Transmission slipping or engine revving without acceleration
- Check Engine Light illuminated
- Transmission may go into limp mode
2. Most Common Causes
- Worn or damaged friction discs in the second gear clutch
- Leaking or failed sealing rings in the second gear clutch
- Faulty or stuck shift solenoid valve
- Worn pressure control valve in the valve body
- Improper transmission fluid level or condition (low, contaminated, or incorrect fluid)
- Faulty input (turbine) or output speed sensor
- Wiring or connector issues in the speed sensor circuit
- Internal mechanical transmission failure (damaged gears, shafts, or planetary sets)
- Torque converter or lock-up clutch problem
3. Step-by-Step Diagnosis
Step 1: Check transmission fluid level and condition; top off or replace if necessary.
Step 2: Scan for additional codes and perform a transmission pressure test.
Step 3: Inspect wiring and connectors to the transmission control module and solenoids.
Step 4: Perform a stall test to isolate the faulty gear; if 2nd gear slips, internal repair is needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, driving with P0732 can cause further transmission damage. It is best to have it towed to a shop.
How much does it cost to fix?▼
Costs range from $150 for fluid/flush to $400+ for internal repairs or replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.