AutoCodes – Isuzu – P1790 Isuzu

P1790 Isuzu Code - Lock-Up Clutch Not Engaging

Quick Answer

P1790 Isuzu indicates Lock-Up Clutch Not Engaging. Common causes include Faulty Throttle Position (TP) Sensor, Throttle Position (TP) Sensor harness is open or shorted, Throttle Position (TP) Sensor circuit poor electrical connection. 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: P1790 Isuzu indicates Lock-Up Clutch Not Engaging.
Common causes: Common causes include Faulty Throttle Position (TP) Sensor, Throttle Position (TP) Sensor harness is open or shorted, Throttle Position (TP) Sensor circuit poor electrical connection.
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.

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Code Popularity 1,887

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1790 Isuzu Description

OBDII Code P1790 Isuzu - Lock-Up Clutch Not Engaging - AutoCodes.com — P1790 Isuzu Code - Lock-Up Clutch Not Engaging

What does this mean?

What are the Possible Causes of the DTC P1790 Isuzu?

Faulty Throttle Position (TP) Sensor
Throttle Position (TP) Sensor harness is open or shorted
Throttle Position (TP) Sensor circuit poor electrical connection

How to Fix the DTC P1790 Isuzu?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1790 Isuzu 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 P1790 Isuzu code?

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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 P1790 Isuzu Code

1. What is OBDII code P1790 for Isuzu?

Code P1790 in Isuzu vehicles indicates a problem with the Lock-Up Clutch not engaging properly.

2. What are the common symptoms of OBDII code P1790 in Isuzu vehicles?

Common symptoms of code P1790 include harsh shifting, transmission slipping, and decreased fuel efficiency.

3. What are the possible causes of OBDII code P1790 in Isuzu vehicles?

Potential causes of code P1790 include a faulty lock-up solenoid, damaged wiring or connectors, low transmission fluid level, or a malfunctioning torque converter.

4. How can I diagnose OBDII code P1790 in my Isuzu?

Diagnosing code P1790 may involve using a scan tool to retrieve the trouble codes, checking the transmission fluid level and condition, inspecting the wiring and connectors, and testing the lock-up clutch solenoid.

5. Can I continue driving my Isuzu with OBDII code P1790?

It is not recommended to drive your Isuzu with code P1790 as it can lead to further damage to the transmission. It's best to address the issue promptly.

6. How can I repair OBDII code P1790 in my Isuzu?

Repairing code P1790 may involve replacing the lock-up clutch solenoid, repairing damaged wiring or connectors, topping up or changing the transmission fluid, or addressing any underlying transmission issues.

7. Will resetting the OBDII code P1790 in my Isuzu make the problem go away?

Resetting the code may temporarily clear the Check Engine Light, but it will not fix the underlying issue causing code P1790. It's essential to diagnose and repair the problem to prevent it from recurring.

8. Can a DIY enthusiast fix OBDII code P1790 in an Isuzu?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address code P1790 by following repair guides and procedures. However, complex transmission issues may require professional help.

9. How much does it cost to repair OBDII code P1790 in an Isuzu?

The cost of repairing code P1790 in an Isuzu can vary depending on the underlying cause, parts needed, and labor costs. It's advisable to obtain quotes from reputable mechanics or dealerships.

10. How can I prevent OBDII code P1790 from occurring in my Isuzu?

To prevent code P1790, it's essential to maintain your Isuzu's transmission system regularly by ensuring proper fluid levels, addressing any leaks promptly, and following the manufacturer's recommended maintenance schedule.