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Engine-Codes – Generic – P1749

P1749 Code - Electronic Pressure Control Solenoid Failed Low Conditions

Quick Answer

When the diagnostic code P1749 appears, it indicates that the electronic pressure control solenoid in the vehicle's transmission has failed to operate at a sufficient level. Common causes include Faulty electronic pressure control solenoid, Electrical issues such as wiring or connector problems, Low transmission fluid levels or dirty fluid. 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 electronic pressure control solenoid, Electrical issues such as wiring or connector problems, Low transmission fluid levels or dirty fluid.
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 07, 2024
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Code P1749 Description

When the diagnostic code P1749 appears, it indicates that the electronic pressure control solenoid in the vehicle's transmission has failed to operate at a sufficient level. This component is responsible for regulating the hydraulic pressure within the transmission, ensuring smooth gear shifts and overall transmission performance. When the solenoid fails to operate correctly, it can lead to various issues with the transmission system, affecting the vehicle's performance and drivability.

OBDII Code P1749 - Electronic Pressure Control Solenoid Failed Low Conditions
P1749 Code - Electronic Pressure Control Solenoid Failed Low Conditions

Common Causes of P1749

  1. Faulty electronic pressure control solenoid
  2. Electrical issues such as wiring or connector problems
  3. Low transmission fluid levels or dirty fluid
  4. Mechanical issues within the transmission
  5. Software or programming issues in the transmission control module

Symptoms of P1749

  1. Erratic shifting behavior
  2. Harsh or delayed gear changes
  3. Transmission slipping
  4. Transmission overheating
  5. Reduced fuel efficiency

How to Fix P1749

  1. Diagnose the issue using a diagnostic scanner to confirm the P1749 code and identify the specific cause.
  2. Inspect the electronic pressure control solenoid for any signs of damage or malfunction.
  3. Check the transmission fluid level and condition, topping up or replacing as necessary.
  4. Test the electrical connections and wiring associated with the solenoid to ensure proper functioning.
  5. Replace the electronic pressure control solenoid if it is found to be faulty, following manufacturer's guidelines and recommendations.

Cost to Fix P1749

The typical repair costs for addressing the P1749 code and replacing the electronic pressure control solenoid can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

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Code P1749 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.

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