AutoCodes – Generic – P0885

P0885 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 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 32,128

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

What does this mean?

What are the Possible Causes of the DTC P0885?

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?

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 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 P0885 code?

Need more information on how to fix the P0885 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0885 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0885 Chrysler — TCM Power Relay Control Circuit/Open
P0885 Dodge — TCM Power Relay Control Circuit/Open
P0885 Hyundai — A/T Control Relay Malfunction
P0885 Jeep — TCM Power Relay Control Circuit/Open
P0885 KIA — A/T Control Relay Malfunction
P0885 RAM — TCM Power Relay Control Circuit/Open

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 Code

What does the OBDII code P0885 mean?

P0885 indicates a problem with the Transmission Control Module (TCM) power relay control circuit, specifically that the circuit is open or there is a malfunction.

What are the common symptoms of a P0885 code?

Common symptoms include the check engine light being illuminated, transmission shifting issues, and the vehicle may enter limp mode or fail to shift properly.

What can cause the P0885 code to trigger?

Causes can include a defective TCM power relay, a blown fuse, wiring issues such as shorts or open circuits, or a malfunctioning transmission control module itself.

How can I diagnose a P0885 code?

Start by checking the TCM power relay and related fuses for faults. Then, inspect the wiring and connectors for damage. Use a multimeter to test the relay and circuit for continuity.

What is the typical repair for a P0885 code?

Repairs may involve replacing a faulty TCM power relay, fixing wiring issues, or replacing blown fuses. In some cases, the TCM may need to be reprogrammed or replaced.

Can I drive my vehicle with a P0885 code?

It is not advisable to drive the vehicle as the transmission may not function properly, which can lead to further damage or unsafe driving conditions.

Will clearing the code P0885 reset my vehicle's systems?

Clearing the code may turn off the check engine light temporarily, but if the underlying issue is not resolved, the code will likely return.

How can I prevent the P0885 code from recurring?

Regular maintenance, such as checking the electrical system and ensuring connections are secure, can help. Address any transmission issues promptly to avoid further complications.

Is there a specific vehicle make or model that is more prone to P0885 codes?

While any vehicle with an automatic transmission can experience a P0885 code, some specific models may have known issues with their TCM or relay systems. Checking manufacturer service bulletins can provide more insight.