AutoCodes – Generic – P1749

P1749 Code - Electronic Pressure Control Solenoid Failed Low Conditions

Quick Answer

With the engine running in gear at cruise speed and the Powertrain Control Module (PCM) detects that the Torque Converter Clutch (TCC) circuit failed low. Common causes include Faulty Line Pressure Solenoid, Line Pressure Solenoid harness is open or shorted, Line Pressure Solenoid circuit poor electrical connection. 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: P1749 indicates Electronic Pressure Control Solenoid Failed Low Conditions.
Common causes: Common causes include Faulty Line Pressure Solenoid, Line Pressure Solenoid harness is open or shorted, Line Pressure Solenoid circuit poor electrical connection.
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 26,774

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 Sep 14, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1749 Description

With the engine running in gear at cruise speed and the Powertrain Control Module (PCM) detects that the Torque Converter Clutch (TCC) circuit failed low.

OBDII Code P1749 - Electronic Pressure Control Solenoid Failed Low Conditions - AutoCodes.com — P1749 Code - Electronic Pressure Control Solenoid Failed Low Conditions

What does this mean?

What are the Possible Causes of the DTC P1749?

Faulty Line Pressure Solenoid
Line Pressure Solenoid harness is open or shorted
Line Pressure Solenoid circuit poor electrical connection

How to Fix the DTC P1749?

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 P1749 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 P1749 code?

Need more information on how to fix the P1749 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1749 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1749 Dodge — Transmission Throttle Valve Position Sensor Circuit Low
P1749 Ford — Electronic Pressure Control Solenoid Failed Low Conditions
P1749 Hyundai — Serial Communication Link
P1749 Mazda — Electronic Pressure Control Solenoid Failed Low Conditions

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 P1749 Code

1. What are the common symptoms of OBDII code P1749 (Electronic Pressure Control Solenoid Failed Low Conditions)?

The common symptoms include harsh shifting, transmission slipping, poor fuel economy, and the transmission staying in one gear.

2. What causes the Electronic Pressure Control Solenoid to fail low and trigger code P1749?

The Electronic Pressure Control (EPC) solenoid can fail low due to issues such as a faulty solenoid, low transmission fluid, a malfunctioning transmission control module, or wiring/connectivity problems.

3. How serious is OBDII code P1749?

Code P1749 should be addressed promptly as it can lead to further transmission damage if left untreated. It is recommended to have the vehicle diagnosed and repaired by a qualified mechanic.

4. Can I drive my vehicle with OBDII code P1749 present?

It is not recommended to drive your vehicle with code P1749 present, as it can cause further damage to the transmission. It is best to have the issue diagnosed and repaired as soon as possible.

5. How is OBDII code P1749 diagnosed?

Diagnosing code P1749 typically involves using a scan tool to retrieve the fault code and then performing further tests to pinpoint the exact cause, such as checking the EPC solenoid, inspecting the transmission fluid level and condition, and testing the wiring.

6. What are some repair tips for fixing OBDII code P1749?

Repair tips may include replacing the Electronic Pressure Control (EPC) solenoid, ensuring proper transmission fluid levels and quality, checking for any wiring issues, and resetting the fault code after repairs are completed.

7. Can I reset OBDII code P1749 without fixing the underlying issue?

While you can clear the fault code temporarily, it is not recommended to do so without addressing the root cause. The issue will likely reoccur, potentially causing more extensive damage.

8. How much does it typically cost to repair OBDII code P1749?

The cost of repairing code P1749 can vary depending on the underlying cause, the labor rates of the repair shop, and the cost of parts. It is advisable to obtain quotes from different mechanics to compare prices.

9. Are there any DIY fixes for OBDII code P1749?

Repairing code P1749 often requires specialized tools and knowledge, so it is best to have a professional mechanic diagnose and fix the issue. Attempting DIY fixes may lead to further damage.

10. How can I prevent OBDII code P1749 from occurring in the future?

Regular maintenance of your vehicle, including checking transmission fluid levels, performing timely fluid changes, and addressing any issues promptly, can help prevent code P1749 and other transmission-related problems.