AutoCodes – Chevrolet – P0733 2018 Chevrolet Silverado

P0733 2018 Chevrolet Silverado Code - Transmission 3rd Gear Ratio Incorrect

Quick Answer

The transmission turbine speed sensor and vehicle speed sensor are hall-effect sensors. Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine Sensor. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0733 2018 Chevrolet Silverado indicates Transmission 3rd Gear Ratio Incorrect.
Common causes: Common causes include Low transmission fluid level, Shift solenoid mechanical fault, Faulty Turbine Sensor.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 369

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0733 2018 Chevrolet Silverado Description

The transmission turbine speed sensor and vehicle speed sensor are hall-effect sensors. The turbine speed sensor is mounted to the transmission housing and faces the reluctor attached to the 1-2-3-4-5-6 clutch piston housing. The vehicle speed sensor is mounted to the low and reverse clutch housing on 2WD, or transfer case rear case half on 4WD. The vehicle speed sensor faces a reluctor wheel attached to the transmission output shaft on 2WD, or a reluctor wheel attached to the transfer case rear output shaft on 4WD.
The TCM provides a 9 V reference circuit and a signal circuit to each of the sensors. As the 1-2-3-4-5-6 clutch piston housing and transmission output shaft or transfer case output rotates, the sensors produce a signal frequency based on the teeth on the reluctor wheel. The TCM calculates the transmission gear ratio based on the speed sensor signals and compares the calculated gear ratio to the commanded gear ratio.
The Diagnostic Trouble Code (DTC) will be set when the TCM detects the calculated gear ratio with 3rd gear commanded differs from the known 6th gear ratio for 2 s.

OBDII Code P0733 2018 Chevrolet Silverado - Transmission 3rd Gear Ratio Incorrect - AutoCodes.com — P0733 2018 Chevrolet Silverado Code - Transmission 3rd Gear Ratio Incorrect

What does this mean?

What are the Possible Causes of the DTC P0733 2018 Chevrolet Silverado?

Low transmission fluid level
Shift solenoid mechanical fault
Faulty Turbine Sensor
Faulty Output Speed Sensor

How to Fix the DTC P0733 2018 Chevrolet Silverado?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Incorrect ratio Diagnostic Trouble Code (DTC) may indicate a component condition with piston seals, clutch plates, or solenoids or it may be caused by a faulty turbine or output speed sensor signal.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0733 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0733 2018 Chevrolet Silverado code?

Need more information on how to fix the P0733 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0733 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0733 2018 Chevrolet Silverado Code

1. What does the OBDII code P0733 mean on a 2018 Chevrolet Silverado?

P0733 indicates that the Powertrain Control Module (PCM) has detected an incorrect gear ratio in 3rd gear, meaning the transmission is not performing as expected in that gear.

2. What are common symptoms of the P0733 code on a 2018 Chevrolet Silverado?

Common symptoms include slipping in 3rd gear, harsh or delayed shifting, poor acceleration, decreased fuel efficiency, and the Check Engine Light being illuminated.

3. What causes the P0733 code on a 2018 Chevrolet Silverado?

Possible causes include low transmission fluid, a faulty shift solenoid, worn or damaged transmission components (like clutches or bands), or a malfunctioning PCM.

4. Can low transmission fluid cause a P0733 code on my Silverado?

Yes, low or contaminated transmission fluid can result in improper hydraulic pressure, leading to the incorrect gear ratio and triggering the P0733 code.

5. How can I fix the P0733 code on my 2018 Chevrolet Silverado?

Repairs may involve checking and topping off transmission fluid, replacing a faulty shift solenoid, repairing internal transmission damage, or reprogramming or replacing the PCM.

6. Is it safe to drive my 2018 Chevrolet Silverado with a P0733 code?

Driving with a P0733 code is not recommended, as it may cause further damage to the transmission and lead to more expensive repairs.

7. How do I diagnose the P0733 code on my Silverado?

Diagnosis typically includes checking transmission fluid levels, scanning for additional codes, inspecting the shift solenoids, testing the transmission hydraulic pressure, and possibly inspecting internal transmission components.

8. Can a faulty PCM cause the P0733 code in a 2018 Chevrolet Silverado?

Yes, a malfunctioning PCM can send incorrect signals to the transmission, resulting in improper gear ratios and the P0733 code.

9. How much does it cost to repair a P0733 code on a 2018 Chevrolet Silverado?

Repair costs vary depending on the issue, ranging from around $100 for a fluid change to over $2,000 if a transmission rebuild or replacement is needed.

10. Will clearing the P0733 code fix the problem on my Silverado?

No, clearing the code will only turn off the warning temporarily. The underlying issue causing the code must be addressed to prevent it from returning.