[SOLVED] Dodge P1790 Code: Fast Fix For Shift Solenoid Malfunction

The OBD code P1790 for Dodge indicates a transmissionrelated issue.

Symptoms include the Engine Light being ON.

The code is typically caused by an internal mechanical problem within the transmission.

It is a serious issue that requires attention.

A possible fix is to inspect the wiring harness, connectors, and components for any damage or corrosion.

Repair Importance Level	10.0 (Out of 10)
Estimated Repair Time	Approximately 1.0 hour
Repair Difficulty Level	10.0 (Out of 10)

Symptoms of the Dodge p1790 OBD Code

The Dodge P1790 fault code typically indicates issues with the transmission’s malfunction indicator lamp circuit.

Symptoms: Engine Light ON.
Harsh shifting from the transmission.
Vehicle may go into limp mode where it stays in one gear.
Difficulty shifting gears.
Transmission may slip.

Causes of the Dodge p1790 OBD Code

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P1790 in Dodge vehicles typically indicates a fault related to the transmission control module.

P1790 can be caused by a faulty transmission speed sensor.
A broken transmission solenoid.
Low voltage in the transmission control module.
Corroded electrical connectors in the transmission system.
Or a damaged wiring harness in the transmission circuit.
Transmission has an internal mechanical problem.

Fixing Dodge Error Code p1790 Step By Step

Address the issue by inspecting the transmission control module and related wiring for faults or damage.

To fix the Dodge OBDII code P1790, start by reviewing the possible causes mentioned above.
Visually examine the wiring harness and connectors related to the transmission control module (TCM).
Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
Test the voltage supply to the TCM to ensure it is within specifications.
If the wiring and connectors are in good condition and the voltage is correct, consider reprogramming or replacing the TCM as needed.

Cost Of Fixing Dodge p1790 Fault Code

Diagnosing and repairing Dodge code P1790 typically involves addressing issues with the transmission control module.

The cost to diagnose and fix the Dodge OBD code P1790 typically ranges from $75 to $150, with an estimated repair time of 1. 0 hour.

The total cost depends on shop rates, complexity of the issue, and any additional parts or labor needed for the repair.

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Details of the Dodge p1790 OBD Code

Dodge fault code P1790 relates to the transmission’s lowreverse hydraulic pressure switch circuit.

Dodge OBD code P1790 indicates that the transmission control module has detected an issue with the transmission’s lockup torque converter solenoid circuit.

This code is triggered when the transmission control module detects an incorrect voltage signal from the lockup torque converter solenoid circuit.

The lockup torque converter solenoid is responsible for engaging and disengaging the torque converter lockup clutch, which helps improve fuel efficiency and reduce heat buildup in the transmission.

When this circuit malfunctions, it can lead to drivability issues and poor fuel economy.

Mechanic’s Tech Notes

For Dodge code P1790, check for issues with the transmission control module power and ground circuits.

To diagnose and fix OBDII code P1790 in a Dodge, start by checking the Transmission Control Module (TCM) power and ground using a multimeter.

Verify TCM communication over the Controller Area Network (CAN) network with a scan tool.

If the TCM does not respond, reprogramming or reflashing may be necessary.

Visually inspect the wiring harness and connectors for any damage, and check connector pins for signs of being broken, bent, pushed out, or corroded.

Address any issues found during the inspection to resolve the P1790 fault code.

FAQ

1. What are the common symptoms associated with OBD code P1790 in a Dodge vehicle?

Common symptoms for OBD code P1790 in a Dodge vehicle include Engine Light ON and transmission internal mechanical issues. Check wiring harness and connectors for damage.

2. What is the typical cause of OBD code P1790 in Dodge vehicles?

OBD code P1790 in Dodge vehicles is typically caused by an internal mechanical issue in the transmission. Check wiring harness, connectors, and components for damage or corrosion.

3. How can I effectively diagnose and repair OBD code P1790 in my Dodge vehicle?

Diagnose P1790 by checking for internal transmission issues. Inspect wiring harness, connectors, and pins for damage or corrosion. Repair as needed for Dodge vehicle.

Wrap Up

If your Dodge is displaying OBD code P1790 and experiencing shifting issues, it could be caused by a faulty transmission control module (TCM), a malfunctioning transmission speed sensor, or wiring/connectivity problems between the TCM and transmission components.

To address Dodge OBD code P1790, check the TCM for any signs of damage or corrosion, inspect the transmission speed sensor for proper operation, and thoroughly examine the wiring harness and connectors for any breaks, shorts, or loose connections.

Consider replacing the TCM or speed sensor if necessary.