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 result from low transmission fluid, a faulty TCM, or wiring problems. The vehicle will likely have reduced drivability and may enter limp mode.
01. Most Common Causes
- Stuck shift solenoid
- Valve body malfunction
- Low or contaminated transmission fluid
- Internal transmission mechanical failure
- Faulty transmission control module (TCM)
02. Symptoms You Will Notice
- Transmission stuck in 6th gear
- Harsh or delayed shifting
- Check Engine Light illuminated
- Reduced fuel economy
- Vehicle enters limp mode
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition.
Step 3: Inspect wiring and connectors to the transmission and TCM.
Step 4: Perform solenoid resistance tests and actuation tests.
Step 5: If no electrical issues, suspect internal mechanical failure; consult a transmission specialist.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may fail completely, leaving you stranded. If you must drive, keep speeds low and avoid heavy acceleration.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repairs can range from a simple fluid change ($100-$200) to solenoid replacement ($300-$800) or a full transmission rebuild ($1500-$4000).