AutoCodes – Generic – P1738

P1738 Code - Problem in 2nd Clutch Pressure Switch Circuit

Quick Answer

The 2nd Clutch Pressure Switch is normally an open switch, the switch closes when the 2nd clutch oil press is applied to it. Common causes include Faulty 2nd Clutch Pressure Switch, 2nd Clutch Pressure Switch harness is open or shorted, 2nd Clutch Pressure Switch 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: P1738 indicates Problem in 2nd Clutch Pressure Switch Circuit.
Common causes: Common causes include Faulty 2nd Clutch Pressure Switch, 2nd Clutch Pressure Switch harness is open or shorted, 2nd Clutch Pressure Switch 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 27,338

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 Jul 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1738 Description

The 2nd Clutch Pressure Switch is normally an open switch, the switch closes when the 2nd clutch oil press is applied to it. Powertrain Control Module (PCM) uses information from the switch to adjust hydraulic pressure application timing. The Powertrain Control Module monitors the 2nd Clutch Pressure Switch. The Powertrain Control Module will set the Diagnostic Trouble Code (DTC) when it detects a 2nd Clutch Pressure Switch malfunction.

OBDII Code P1738 - Problem in 2nd Clutch Pressure Switch Circuit - AutoCodes.com — P1738 Code - Problem in 2nd Clutch Pressure Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P1738?

Faulty 2nd Clutch Pressure Switch
2nd Clutch Pressure Switch harness is open or shorted
2nd Clutch Pressure Switch circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1738?

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 P1738 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 P1738 code?

Need more information on how to fix the P1738 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1738 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1738 Acura — Problem in 2nd Clutch Pressure Switch Circuit
P1738 Honda — Problem in 2nd Clutch Pressure Switch Circuit
P1738 Hyundai — Shift System Time Out
P1738 Isuzu — Problem in 2nd Clutch Pressure Switch Circuit

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 P1738 Code

1. What are the common symptoms of OBDII code P1738?

- Common symptoms include harsh shifting, delayed shifting, transmission slippage, and illuminated Check Engine light.

2. What causes the OBDII code P1738 to trigger?

- The code is triggered when there is a problem detected in the 2nd clutch pressure switch circuit within the transmission.

3. How serious is the OBDII code P1738?

- The code indicates a malfunction in the transmission system, which can potentially lead to further damage if not addressed promptly.

4. How can I diagnose the problem related to the 2nd clutch pressure switch circuit?

- Diagnosis typically involves using a scan tool to retrieve the trouble codes, checking the wiring and connectors related to the switch, and performing a thorough inspection of the transmission system.

5. Can I continue driving my vehicle with the OBDII code P1738 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further transmission issues and potential safety hazards.

6. What are the repair options for resolving the OBDII code P1738?

- Repair options may include replacing the faulty 2nd clutch pressure switch, repairing damaged wiring or connectors, or seeking professional help from a qualified mechanic.

7. How much does it typically cost to fix the issue related to the 2nd clutch pressure switch circuit?

- The cost of repairs can vary depending on the extent of the damage and the specific components that need to be replaced, but it can range from a few hundred to over a thousand dollars.

8. Are there any DIY tips for addressing the OBDII code P1738?

- DIY tips may include checking and cleaning the connectors, inspecting the wiring for any visible damage, and ensuring that the transmission fluid is at the correct level and in good condition.

9. Can a faulty 2nd clutch pressure switch circuit affect the overall performance of the vehicle?

- Yes, a faulty circuit can lead to transmission issues, affecting the vehicle's performance, fuel efficiency, and overall drivability.

10. Is it necessary to reset the OBDII code P1738 after repairs have been made?

- Yes, it is recommended to reset the code using a scan tool after repairs have been completed to clear the Check Engine light and monitor if the issue has been successfully resolved.