AutoCodes – RAM – P0871 RAM

P0871 RAM Code - OD Pressure Switch Rationality Fault

Quick Answer

The Powertrain Control Module (PCM) uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD clutch circuits. Common causes include OD Pressure Switch harness is open or shorted, OD Pressure Switch circuit poor electrical connection, Faulty OD Pressure Switch. 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: P0871 RAM indicates OD Pressure Switch Rationality Fault.
Common causes: Common causes include OD Pressure Switch harness is open or shorted, OD Pressure Switch circuit poor electrical connection, Faulty OD Pressure Switch.
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 3,254

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 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0871 RAM Description

The Powertrain Control Module (PCM) uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear. This Diagnostic Trouble Code (DTC) is set if the OD pressure switch is open or closed at the wrong time in a given gear.

OBDII Code P0871 RAM - OD Pressure Switch Rationality Fault - AutoCodes.com — P0871 RAM Code - OD Pressure Switch Rationality Fault

What does this mean?

What are the Possible Causes of the DTC P0871 RAM?

OD Pressure Switch harness is open or shorted
OD Pressure Switch circuit poor electrical connection
Faulty OD Pressure Switch
Internal transmission damage
Faulty Powertrain Control Module (PCM)
Faulty Transmission Control Module (TCM)

How to Fix the DTC P0871 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 P0871 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 P0871 RAM Code

1. What are common symptoms of OBDII code P0871 RAM (OD Pressure Switch Rationality Fault)?

The common symptoms include harsh shifting, transmission slipping, illuminated Check Engine Light, and decreased fuel efficiency.

2. What are the possible causes of OBDII code P0871 RAM?

Possible causes of this code include a faulty transmission pressure switch, low transmission fluid levels, internal transmission issues, or a malfunctioning transmission control module.

3. How can I diagnose OBDII code P0871 RAM?

Diagnosing this code typically involves using a scan tool to retrieve the code and checking the transmission fluid level and condition. Additionally, conducting a thorough inspection of the transmission pressure switch and related components is recommended.

4. Can I continue driving with OBDII code P0871 RAM?

It is not recommended to continue driving with this code present, as it can lead to further damage to the transmission. It is best to address the issue promptly to avoid costly repairs.

5. How can I repair OBDII code P0871 RAM?

Repairing this code may involve replacing the faulty OD pressure switch, checking and topping up transmission fluid, or addressing any other underlying transmission issues. It is advisable to consult a professional mechanic for an accurate diagnosis and repair.

6. Is it possible to reset OBDII code P0871 RAM without fixing the underlying issue?

Resetting the code without addressing the underlying issue will not solve the problem. The code will likely reappear once the vehicle is driven again, indicating that the issue still persists.

7. Can a DIY enthusiast fix OBDII code P0871 RAM at home?

Depending on your level of automotive knowledge and tools available, some DIY enthusiasts may be able to address this code at home. However, due to the complexity of transmission systems, it is recommended to seek professional help for accurate diagnosis and repair.

8. How much does it cost to repair OBDII code P0871 RAM?

The cost of repairing this code can vary depending on the underlying issue, parts needed, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops to get an accurate estimate.

9. Will OBDII code P0871 RAM cause permanent damage to the transmission?

Continued driving with this code can potentially cause permanent damage to the transmission. It is crucial to address the issue promptly to prevent further complications and costly repairs.

10. How long does it take to repair OBDII code P0871 RAM?

The repair time for this code can vary depending on the specific issue and the availability of parts. Some repairs may be completed in a few hours, while more complex issues may take longer. It is best to consult with a professional mechanic for a more accurate timeframe.