AutoCodes – RAM – P0988 RAM

P0988 RAM Code - 4C Pressure Switch Sense Circuit

Quick Answer

The Diagnostic Trouble Code (DTC) P0988 will set if 4C (4th clutch) pressure switch is open or closed at the wrong time in a given gear. Common causes include Faulty 4C Pressure Switch, 4C Pressure Switch harness is open or shorted, 4C 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: P0988 RAM indicates 4C Pressure Switch Sense Circuit.
Common causes: Common causes include Faulty 4C Pressure Switch, 4C Pressure Switch harness is open or shorted, 4C 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 1,144

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 Dec 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0988 RAM Description

The Diagnostic Trouble Code (DTC) P0988 will set if 4C (4th clutch) pressure switch is open or closed at the wrong time in a given gear. For example, this DTC would be set if the 4C pressure switch came on while the transmission was in second gear. The transmission system will default to an immediate shutdown routine.

OBDII Code P0988 RAM - 4C Pressure Switch Sense Circuit - AutoCodes.com — P0988 RAM Code - 4C Pressure Switch Sense Circuit

What does this mean?

What are the Possible Causes of the DTC P0988 RAM?

Faulty 4C Pressure Switch
4C Pressure Switch harness is open or shorted
4C Pressure Switch circuit poor electrical connection
Open Transmission Control Relay
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0988 RAM?

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 P0988 RAM 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 P0988 RAM Code

1. What are the common symptoms of OBDII code P0988 RAM (4C Pressure Switch Sense Circuit)?

The common symptoms include harsh shifting, transmission slippage, and the transmission may not shift into certain gears.

2. What causes OBDII code P0988 RAM to trigger?

The code P0988 RAM (4C Pressure Switch Sense Circuit) is typically triggered by a faulty 4C pressure switch, damaged wiring or connectors related to the switch, or a low transmission fluid level.

3. How can I diagnose the issue causing OBDII code P0988 RAM?

Diagnosing the issue involves checking the wiring and connectors related to the 4C pressure switch, testing the switch itself for proper functionality, and inspecting the transmission fluid level and condition.

4. Can I continue driving with OBDII code P0988 RAM present?

Continuing to drive with this code present is not recommended as it can lead to further transmission damage and potentially unsafe driving conditions.

5. How do I repair OBDII code P0988 RAM?

Repairing this code may involve replacing the 4C pressure switch, repairing or replacing damaged wiring or connectors, and ensuring the transmission fluid is at the correct level and in good condition.

6. Is it possible to clear OBDII code P0988 RAM without fixing the underlying issue?

Clearing the code without addressing the underlying issue will likely result in the code reappearing once the problem is detected again during vehicle operation.

7. Can a DIY enthusiast fix OBDII code P0988 RAM?

Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair the issue causing OBDII code P0988 RAM, but professional help is recommended for complex transmission issues.

8. How much does it cost to repair OBDII code P0988 RAM?

The cost of repairing this code can vary depending on the specific cause of the issue, but it may involve parts and labor costs for replacing the 4C pressure switch or repairing the wiring.

9. Will OBDII code P0988 RAM affect fuel efficiency?

While the code itself may not directly impact fuel efficiency, driving with transmission issues can lead to decreased fuel efficiency due to improper shifting and increased strain on the engine.

10. Is OBDII code P0988 RAM a common issue in certain vehicle models?

This code may be more common in certain vehicle models with automatic transmissions, particularly if they are older or have higher mileage. Regular maintenance can help prevent such issues.