P073B - Stuck in Gear 6
The P073B code indicates that the transmission control module (TCM) has detected that the transmission is stuck in 6th gear and cannot shift to other gears. This is typically caused by a mechanical failure within the transmission, such as a stuck shift solenoid, valve body issue, or internal clutch/band failure. It may also be triggered by low transmission fluid, a faulty TCM, or wiring problems. The vehicle will likely have limited drivability and may enter limp mode.
1. Symptoms You Will Notice
- Transmission stuck in 6th gear
- Harsh or delayed shifting
- Check Engine Light illuminated
- Reduced fuel economy
- Vehicle enters limp mode
2. Most Common Causes
- Stuck shift solenoid
- Valve body malfunction
- Low or contaminated transmission fluid
- Faulty transmission control module (TCM)
- Internal transmission mechanical failure (clutch/band)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors to the transmission solenoids and TCM for damage or corrosion.
Step 4: Perform a solenoid resistance test and actuation test using a scan tool.
Step 5: If solenoids and wiring are okay, suspect valve body or internal mechanical failure; consult a transmission specialist.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe to drive with P073B. The transmission may be stuck in 6th gear, causing poor acceleration and potential damage to the transmission. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
The cost varies widely. A simple fluid change or solenoid replacement may cost $150-$400, while a valve body or internal rebuild can range from $1,000 to $3,500 or more.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.