Transmission Stuck in Reverse - P072B
Code P072B indicates that the transmission control module (TCM) has detected the transmission is stuck in reverse gear. This typically occurs due to a mechanical failure within the transmission, such as a stuck shift solenoid, a faulty valve body, or internal damage to the gear train. The TCM monitors gear position via input speed sensors and output speed sensors; when the actual gear ratio does not match the commanded gear, this code is set. Driving with this code can cause further transmission damage and unsafe vehicle operation.
01. Most Common Causes
- Faulty shift solenoid
- Stuck or damaged valve body
- Internal transmission mechanical failure
- Low or contaminated transmission fluid
- Wiring or connector issues in the transmission control circuit
02. Symptoms You Will Notice
- Vehicle remains in reverse gear and will not shift to drive or park
- Transmission warning light or check engine light illuminated
- Harsh or delayed engagement when shifting
- Transmission slipping or unusual noises
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check transmission fluid level and condition.
Step 2: Inspect wiring and connectors to the transmission control module and solenoids.
Step 3: Perform a transmission pressure test and solenoid resistance test.
Step 4: If no electrical issues found, remove transmission pan and inspect for debris or mechanical damage.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The transmission may be stuck in reverse, making the vehicle uncontrollable. Have it towed to a repair shop.
How much does it cost to fix?▼
Costs range from $150 to $400 for solenoid or valve body repairs, but internal transmission failure can exceed $2,000.