AutoCodes – Chrysler – P0778 Chrysler

P0778 Chrysler Code - Shift Pressure Solenoid Circuit

Quick Answer

The shift pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM). Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Shift Pressure Solenoid valve. 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: P0778 Chrysler indicates Shift Pressure Solenoid Circuit.
Common causes: Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Shift Pressure Solenoid valve.
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 8,670

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 Jan 30, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0778 Chrysler Description

The shift pressure solenoid valve regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the Transmission Control Module (TCM).

OBDII Code P0778 Chrysler - Shift Pressure Solenoid Circuit - AutoCodes.com — P0778 Chrysler Code - Shift Pressure Solenoid Circuit

What does this mean?

What are the Possible Causes of the DTC P0778 Chrysler?

Low transmission fluid level
Dirty transmission fluid
Faulty Shift Pressure Solenoid valve
Shift Pressure Solenoid valve harness is open or shorted
Shift Pressure Solenoid valve circuit poor electrical connection

How to Fix the DTC P0778 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 does this mean?

Code Tech Notes

When a transmission solenoid is malfunctioned, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. If the transmission fluid is dirty, it's recommended to change the transmission fluid and if possible removing the transmission pan for further diagnosis. Excessive debris or metal particles on the transmission pan could be an indication that there is a mechanical transmission failure and that the transmission will need to be rebuilt or replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0778 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 P0778 Chrysler Code

1. What does the OBDII code P0778 indicate on a Chrysler vehicle?

The P0778 code indicates a problem with the shift pressure solenoid B circuit, signalling a malfunction related to the solenoid's electrical circuit.

2. What are common symptoms of code P0778 in a Chrysler?

Symptoms include erratic shifting, the transmission slipping, the transmission going into "limp" mode, decreased fuel efficiency, and the Check Engine Light turning on.

3. What can cause the P0778 code to appear on a Chrysler?

Causes may include faulty shift solenoid, poor electrical connections in the shift solenoid circuit, or a shorted or open wiring in the solenoid circuit.

4. How is the P0778 code diagnosed in a Chrysler?

Diagnosis involves using a scan tool to read the fault code and observing the live data. A mechanic might also manually test the shift solenoid and inspect the wiring and connectors for damage or disconnection.

5. What repairs can fix the P0778 code on a Chrysler?

Repairs might include replacing the faulty shift solenoid, repairing or replacing damaged wires or connectors in the solenoid circuit, or cleaning electrical connections to ensure good contact.

6. Is it safe to drive a Chrysler with the P0778 code?

While you might be able to drive with this code, it's not advisable as it can lead to more serious problems like transmission damage. It's best to address the issue as soon as possible.

7. How urgent is it to repair a P0778 code on a Chrysler?

It is fairly urgent to address this issue to avoid potential transmission failure. Delayed repairs can lead to more extensive and costly damages.

8. What tools are needed to diagnose the P0778 code on a Chrysler?

Tools needed include a digital multimeter, an OBD-II scanner, and possibly an oscilloscope to check the solenoid's operation in detail.

9. Can a bad battery or charging system cause the P0778 code on a Chrysler?

While a bad battery or charging system is less likely to cause this specific code, voltage issues can impact the transmission's electronic controls. It's a good idea to ensure the battery and charging system are functioning correctly during diagnosis.

10. What is the cost range for repairing the P0778 code on a Chrysler?

The repair cost can vary widely depending on the required repair: replacing a shift solenoid might cost $150-$400, while more extensive wiring repairs or replacing the transmission control module could be significantly more expensive.