AutoCodes – Jeep – P1787 Jeep

P1787 Jeep Code - OD Hydraulic Pressure Test Failure

Quick Answer

When monitored, in any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter. Common causes include Low transmission fluid level, Faulty Over Drive (OD) Pressure Switch, Over Drive (OD) Pressure Switch harness is open or shorted. 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: P1787 Jeep indicates OD Hydraulic Pressure Test Failure.
Common causes: Common causes include Low transmission fluid level, Faulty Over Drive (OD) Pressure Switch, Over Drive (OD) Pressure Switch harness is open or shorted.
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 4,369

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 18, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1787 Jeep Description

When monitored, in any forward gear with engine speed above 1000 RPM shortly after a shift and every minute thereafter.

OBDII Code P1787 Jeep - OD Hydraulic Pressure Test Failure - AutoCodes.com — P1787 Jeep Code - OD Hydraulic Pressure Test Failure

What does this mean?

What are the Possible Causes of the DTC P1787 Jeep?

Low transmission fluid level
Faulty Over Drive (OD) Pressure Switch
Over Drive (OD) Pressure Switch harness is open or shorted
Over Drive (OD) Pressure Switch circuit poor electrical connection

How to Fix the DTC P1787 Jeep?

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 P1787 Jeep 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.