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Code P0733

Quick reference

P0733 at a glance

Plain-language meaning
This code means that the car's computer thinks the transmission is not working right when it's trying to use third gear. It's like when you're riding a bike and the chain slips, making it hard to pedal smoothly.
Urgency
High – Continuing to drive with this issue can cause further damage to the transmission.
Difficulty
Moderate
System
Transmission Issue
Tools mentioned
OBD-II scanner, Transmission fluid dipstick, Basic hand tools

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

Laymans terms

This code means that the car's computer thinks the transmission is not working right when it's trying to use third gear. It's like when you're riding a bike and the chain slips, making it hard to pedal smoothly.

Explanation

The P0733 code is triggered when the transmission control module (TCM) detects an incorrect gear ratio in third gear.

Technical description

The transmission control module monitors the input and output speed sensors to calculate the gear ratio. If the actual gear ratio does not match the expected gear ratio for third gear, the P0733 code is set. This can be due to mechanical issues in the transmission or problems with the transmission control system.

Symptoms

• Check Engine Light is on

• Transmission slipping

• Poor acceleration

Common Causes

• Low or dirty transmission fluid

• Faulty shift solenoid

• Transmission mechanical failure

Glossary

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

Solenoid: An electromechanical device that controls the flow of fluid within the transmission.

Diagnosis steps

• Check transmission fluid level and condition

• Perform a road test to observe transmission behavior

• Use a scan tool to monitor transmission data

Repair procedures

• Replace or repair faulty shift solenoid

• Flush and replace transmission fluid

• Repair or rebuild transmission

Tools required

• OBD-II scanner

• Transmission fluid dipstick

• Basic hand tools

Estimated repair cost

$300 - $2500

Difficulty level

Moderate

Commonly affected vehicles

• Ford F-150

• Honda Accord

• Toyota Camry

Preventive measures

• Regular transmission fluid changes

• Routine transmission maintenance

• Avoid aggressive driving

Error code type

Transmission Issue

User experience recommendations

• Avoid driving the vehicle until repaired

• Consult a professional mechanic

• Check for recalls or service bulletins

Warranty information

Transmission repairs may be covered under powertrain warranty if the vehicle is within warranty period.

Historical data

P0733 has been a common code associated with automatic transmission issues, often related to fluid maintenance or mechanical wear.

Urgency level

High – Continuing to drive with this issue can cause further damage to the transmission.

Testing conditions

• Vehicle must be driven to replicate the issue

• Transmission must reach operating temperature

Component location

The transmission is located between the engine and the drive wheels, typically under the vehicle.

FAQs

Q: Can I drive with a P0733 code?
A: It's not recommended as it can cause further damage to the transmission.

Q: How urgent is a P0733 code?
A: It's quite urgent and should be addressed as soon as possible to avoid more expensive repairs.

Optional diagnostic gear

Tools that may help diagnose P0733

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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