AutoCodes – Generic – P0988

P0988 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 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 19,359

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

What does this mean?

What are the Possible Causes of the DTC P0988?

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?

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 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 P0988 code?

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Information for Specific Makes

P0988 Chrysler — 4C Pressure Switch Sense Circuit
P0988 Dodge — 4C Pressure Switch Sense Circuit
P0988 Jeep — 4C Pressure Switch Sense Circuit
P0988 RAM — 4C Pressure Switch Sense 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.