AutoCodes – Chrysler – P1790 Chrysler

P1790 Chrysler 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 Chrysler 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 879

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 Chrysler 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 Chrysler - Fault Immediately After Shift - AutoCodes.com — P1790 Chrysler Code - Fault Immediately After Shift

What does this mean?

What are the Possible Causes of the DTC P1790 Chrysler?

Transmission has an internal mechanical problem

How to Fix the DTC P1790 Chrysler?

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 Chrysler 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.

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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 Chrysler Code

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Juan David Rodríguez marquez
Date: June 19, 2025 at 12:11 pm

Me puede ayudar de favor tengo un problema con una camioneta town&country me saca el código p1790.
Motor 3.8
2008

Reply to Comment
- OBDIITech
  Date: June 19, 2025 at 1:58 pm
  Claro, con gusto. El código P1790 en tu Town & Country 2008 con motor 3.8L indica que la transmisión detectó una falla justo después de un cambio de marcha. Este código no señala una parte específica, pero normalmente aparece cuando hay un problema en cómo la transmisión completa el cambio.
  
  Aquí algunas cosas que debes revisar primero:
  1. Nivel y estado del aceite de transmisión – Si está bajo, sucio o quemado, puede causar este tipo de fallos. Revisa el nivel en caliente con el motor encendido.
  2. Sensor de velocidad de entrada o salida (input/output speed sensor) – Si uno de estos sensores falla o tiene una señal intermitente, puede provocar ese código.
  3. Problemas eléctricos o de tierra – Conectores sueltos o corrosión en el arnés hacia la TCM (módulo de transmisión) pueden causar fallos falsos.
  4. TCM defectuoso o reprogramación pendiente – En algunos casos, una actualización del software o incluso reemplazo del módulo puede ser necesaria.
  Si la transmisión funciona bien al conducir, puede que sea algo leve como el sensor o el fluido. Pero si notas cambios bruscos, deslizamiento o falla al entrar en marcha, mejor evitar usarla mucho hasta revisarla. Puedes escanear con un equipo que lea los códigos específicos de transmisión para obtener más detalle.
  Reply to Comment