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P1790 Dodge Code - Fault Immediately After Shift

Quick Answer

The P1790 fault code for Dodge vehicles indicates a problem that occurs immediately after a shift. Common causes include Low or contaminated transmission fluid, Faulty shift solenoids, Worn-out clutch packs. 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 Dodge indicates Fault Immediately After Shift.
Common causes
Common causes include Low or contaminated transmission fluid, Faulty shift solenoids, Worn-out clutch packs.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1790 Dodge Description

The P1790 fault code for Dodge vehicles indicates a problem that occurs immediately after a shift. This could be related to issues with the transmission, such as gear engagement problems, shift solenoid malfunctions, or hydraulic pressure irregularities. When this code is triggered, it can affect the vehicle's performance by causing harsh shifting, slipping gears, delayed engagement, or even total transmission failure.

OBDII Code P1790 Dodge - Fault Immediately After Shift
P1790 Dodge Code - Fault Immediately After Shift

Common Causes of P1790 Dodge

  1. Low or contaminated transmission fluid.
  2. Faulty shift solenoids.
  3. Worn-out clutch packs.
  4. Malfunctioning transmission control module.
  5. Mechanical issues within the transmission, such as a damaged valve body.

Symptoms of P1790 Dodge

  1. Harsh shifting when changing gears.
  2. Delayed engagement when shifting from park to drive or reverse.
  3. Slipping gears during acceleration.
  4. Transmission overheating.
  5. Check engine light illuminated on the dash.

How to Fix P1790 Dodge

  1. Begin by checking the transmission fluid level and condition. Top off the fluid if low or replace it if it is dirty or contaminated.
  2. Inspect and test the shift solenoids to determine if they are functioning correctly. Replace any faulty solenoids.
  3. Check the clutch packs for wear and tear, replacing them if necessary.
  4. Diagnose the transmission control module for any faults and reprogram or replace it if needed.
  5. If no issues are found with the above components, a more in-depth inspection of the transmission may be required, potentially involving a rebuild or replacement.

Cost to Fix P1790 Dodge

The typical repair costs for a P1790 fault code can vary depending on the specific cause of the issue. On average, you can expect to pay anywhere from $200 to $1000 for parts and labor. However, it's essential to keep in mind that the actual costs can fluctuate based on factors such as the location of the repair shop, the make and model of the vehicle, and the extent of the repairs needed. It's recommended to obtain a detailed estimate from a qualified mechanic before proceeding with the repair.

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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 Dodge Code

1. What does OBDII code P1790 mean on a Dodge vehicle?

P1790 indicates a "Fault Immediately After Shift," meaning the transmission control module (TCM) detected an issue right after a gear shift.

2. What are the common symptoms of P1790 on a Dodge?

Symptoms may include harsh or erratic shifting, transmission slipping, the vehicle going into limp mode, and the check engine light turning on.

3. What causes the P1790 code to trigger?

Common causes include a faulty transmission control module (TCM), issues with the input or output speed sensors, a failing valve body, or low transmission fluid.

4. Can a low transmission fluid level cause the P1790 code?

Yes, low or degraded transmission fluid can affect proper shifting and trigger the P1790 code.

5. How do I diagnose the P1790 code on my Dodge?

Start by checking the transmission fluid level and condition. Then, use an OBDII scanner to check for related codes and inspect the input/output speed sensors, wiring, and TCM functionality.

6. Is it safe to drive with the P1790 code active?

Driving with the P1790 code is not recommended, as it can lead to further damage to the transmission and affect vehicle performance.

7. What repairs are commonly needed to fix the P1790 code?

Repairs may include replacing the input or output speed sensors, repairing wiring or connectors, servicing the valve body, or reprogramming/replacing the TCM.

8. Can clearing the P1790 code fix the problem?

Clearing the code will remove it temporarily, but if the underlying issue is not resolved, the code will likely return.

9. How much does it cost to fix the P1790 code on a Dodge?

Repair costs vary depending on the cause but typically range from $100 for sensor replacements to over $1,000 for major transmission repairs.

10. Can a bad speed sensor trigger the P1790 code?

Yes, a malfunctioning input or output speed sensor can cause incorrect transmission data, leading to the P1790 code.

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