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Code P073B

Quick reference

P073B at a glance

Plain-language meaning
This code means the car's computer thinks the transmission is stuck in sixth gear and can't change to another gear.
Urgency
High – Driving with a stuck gear can cause further damage to the transmission.
Difficulty
Moderate
System
Transmission Issue
Tools mentioned
OBD-II scanner, Transmission fluid tester, Multimeter

This summary uses the existing diagnostic information shown in full below.

Laymans terms

This code means the car's computer thinks the transmission is stuck in sixth gear and can't change to another gear.

Explanation

The transmission control module (TCM) has detected that the transmission is unable to shift out of sixth gear.

Technical description

The P073B code is triggered when the TCM identifies that the transmission is not able to shift out of sixth gear. This could be due to a mechanical issue within the transmission or a problem with the electronic controls.

Symptoms

• Check Engine Light is on

• Vehicle stuck in one gear

• Poor acceleration

Common Causes

• Faulty transmission solenoid

• Transmission fluid issues

• Worn or damaged gears

Glossary

Transmission: A system in a vehicle that transmits power from the engine to the wheels.

Solenoid: An electromechanical device used to control the flow of fluid in the transmission.

Diagnosis steps

• Check for other diagnostic trouble codes

• Inspect transmission fluid level and condition

• Test transmission solenoids

Repair procedures

• Replace faulty solenoid

• Change transmission fluid

• Repair or replace damaged gears

Tools required

• OBD-II scanner

• Transmission fluid tester

• Multimeter

Estimated repair cost

$200 - $1500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Chevrolet Silverado

• Toyota Camry

Preventive measures

• Regular transmission fluid changes

• Avoid aggressive driving

• Routine transmission inspections

Error code type

Transmission Issue

User experience recommendations

• Avoid driving the vehicle if stuck in gear

• Consult a professional mechanic

• Do not ignore the Check Engine Light

Warranty information

Transmission issues may be covered under powertrain warranty. Check with your manufacturer.

Historical data

This code has been more common in vehicles with higher mileage and older transmission systems.

Urgency level

High – Driving with a stuck gear can cause further damage to the transmission.

Testing conditions

• Vehicle at operating temperature

• Driving conditions where gear shifting occurs

Component location

The transmission is located beneath the vehicle, usually between the engine and the drive shaft.

FAQs

Q: Can I drive my car with a P073B code?
A: It's not recommended to drive with this code as it can cause further damage to the transmission.

Q: How do I clear a P073B code?
A: You can clear the code with an OBD-II scanner, but it's important to fix the underlying issue first.

Optional diagnostic gear

Tools that may help diagnose P073B

THINKCAR ThinkScan Bidirectional diagnostic tool illustration

High-End · Full-system diagnostics

THINKCAR ThinkScan Bidirectional

A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.

Network faults often require full-system access instead of a generic code reader alone.

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Klein Tools MM325 diagnostic tool illustration

Universal · Digital multimeter

Klein Tools MM325

A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.

Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.

View on Amazon
WORKPRO Wiring Repair Kit diagnostic tool illustration

Universal · Wire connectors and repair kit

WORKPRO Wiring Repair Kit

Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.

Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.

View on Amazon

These are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.

Source: ezOBD2 diagnostic database
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