AutoCodes – Jeep – P1790 Jeep

P1790 Jeep Code - Fault Immediately After Shift

Quick Answer

This Diagnostic Trouble Code (DTC) is set if the engine is running and the vehicle speed is more than 10 mph in Drive, and the Transmission Control Module (TCM) detects a Speed Ratio Code within 1.3 seconds after a shift event occurs. Common causes include Transmission has an internal mechanical problem. 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 Jeep indicates Fault Immediately After Shift.
Common causes: Common causes include Transmission has an internal mechanical problem.
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 1,267

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 Nov 19, 2023

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

This Diagnostic Trouble Code (DTC) is set if the engine is running and the vehicle speed is more than 10 mph in Drive, and the Transmission Control Module (TCM) detects a Speed Ratio Code within 1.3 seconds after a shift event occurs. The existence of DTC P1790 indicates mechanical or hydraulic (not electrical) related problems. It should be noted, however, that all mechanical problems don't necessarily result in DTC P1790. When this DTC exists, diagnosing the system should be based on the associated DTC and only mechanical causes should be considered.

OBDII Code P1790 Jeep - Fault Immediately After Shift - AutoCodes.com — P1790 Jeep Code - Fault Immediately After Shift

What does this mean?

What are the Possible Causes of the DTC P1790 Jeep?

Transmission has an internal mechanical problem

How to Fix the DTC P1790 Jeep?

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 Jeep 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 Jeep 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.