AutoCodes – RAM – P0885 RAM

P0885 RAM Code - TCM Power Relay Control Circuit/Open

Quick Answer

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. Common causes include Faulty Transmission Control Module (TCM) Power Relay, Transmission Control Module Power Relay harness is open or shorted, Transmission Control Module Power Relay 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: P0885 RAM indicates TCM Power Relay Control Circuit/Open.
Common causes: Common causes include Faulty Transmission Control Module (TCM) Power Relay, Transmission Control Module Power Relay harness is open or shorted, Transmission Control Module Power Relay 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 188

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 08, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0885 RAM Description

The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the Powertrain Control Module (PCM). It is referred to as the Transmission Control Relay Output circuit or switched battery.
Immediately after a controller reset (ignition key turned to the run position or after cranking engine), the PCM verifies that the relay contacts are open by checking for no voltage at the switched battery terminals. After this is verified, the voltage at the pressure switches is checked. There should be no voltage on the pressure switches at this time. The PCM will then activate the relay.

OBDII Code P0885 RAM - TCM Power Relay Control Circuit/Open - AutoCodes.com — P0885 RAM Code - TCM Power Relay Control Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P0885 RAM?

Faulty Transmission Control Module (TCM) Power Relay
Transmission Control Module Power Relay harness is open or shorted
Transmission Control Module Power Relay circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P0885 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 P0885 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 P0885 RAM Code

1. What does the OBDII code P0885 mean on a RAM vehicle?

P0885 indicates an issue with the Transmission Control Module (TCM) power relay control circuit, often due to an open circuit or electrical fault.

2. What are the common symptoms of code P0885 in a RAM vehicle?

Symptoms can include transmission not shifting properly, the vehicle being stuck in limp mode, a check engine light, and poor overall drivability.

3. What causes the P0885 code to appear in a RAM vehicle?

Common causes include a faulty TCM power relay, damaged wiring or connectors, a malfunctioning TCM, or a blown fuse related to the transmission system.

4. Can you drive a RAM vehicle with a P0885 code active?

Driving with this code is not recommended as the transmission may not function correctly, potentially leading to further damage or unsafe driving conditions.

5. How do you diagnose the P0885 code in a RAM vehicle?

Diagnosing involves checking the TCM power relay, inspecting wiring and connectors for damage, testing power supply and ground circuits, and verifying the functionality of the TCM.

6. How do you fix the P0885 code on a RAM vehicle?

Repairs may include replacing the TCM power relay, repairing or replacing damaged wiring or connectors, replacing a blown fuse, or, in rare cases, replacing the TCM itself.

7. Where is the TCM power relay located on a RAM vehicle?

The TCM power relay is typically found in the power distribution center (fuse box), but the exact location may vary depending on the model and year of your RAM vehicle.

8. What tools are needed to fix the P0885 code?

Youâ€™ll need a diagnostic scanner, a multimeter for electrical testing, and possibly basic tools like pliers and screwdrivers to access and repair components.

9. Can a weak battery cause the P0885 code in a RAM vehicle?

Yes, a weak or failing battery can result in insufficient voltage to the TCM, potentially triggering the P0885 code.

10. How much does it cost to repair the P0885 code on a RAM vehicle?

Repair costs can vary but typically range from $50 to $300, depending on whether the issue is a simple relay replacement or involves more extensive wiring repairs or TCM replacement.