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Engine Fault Code P0885

TCM Power Relay Control Circuit/Open

Care Engine Code Reader
The Engine Fault Code P0885 refers to an issue with the Transmission Control Module (TCM) power relay control circuit. This code indicates that there is a problem with the power supply to the TCM, which can affect the transmission`s operation.

Possible Causes:
1. Faulty TCM Relay: The relay that supplies power to the TCM may be defective.
2. Wiring Issues: Damaged or corroded wires in the power circuit can cause an open circuit.
3. Bad TCM: The Transmission Control Module itself may be faulty.
4. Blown Fuse: A blown fuse in the circuit can prevent power from reaching the TCM.
5. Poor Connections: Loose or corroded connectors can disrupt the circuit.

Alternative Meanings by Manufacturer:
While P0885 generally means the same thing across different manufacturers, some brands may have specific nuances in their systems. Here are a few:

1. Mercedes-Benz: The code may also indicate issues with the transmission control system, particularly in models with more complex electronic systems.
2. Audi: Similar to Mercedes, it may point to problems in the Quattro system or advanced transmission features.
3. Land Rover: The code might relate to the Terrain Response system if it`s affecting transmission performance.
4. Jaguar: In some models, it may indicate issues with adaptive transmission features.

What to Do:
If you encounter this code, it`s important to:
– Check the TCM Relay: Test or replace the relay.
– Inspect Wiring: Look for any damaged wires or connectors.
– Check Fuses: Replace any blown fuses related to the TCM.
– Scan for Additional Codes: Other codes may help pinpoint the issue.
– Consult a Professional: If unsure, its best to seek help from a qualified mechanic.

Addressing this code promptly can help avoid further transmission problems.
The Engine Fault Code P0885 refers to an issue with the Transmission Control Module (TCM) power relay control circuit. This code indicates that there is a problem with the power supply to the TCM, which can affect how the transmission operates. Here are some common causes for this code, along with manufacturer-specific differences:

Common Causes:
1. Faulty TCM Power Relay: The relay itself could be defective, preventing the TCM from receiving power.
2. Wiring Issues: Damaged or corroded wires in the circuit can cause an open circuit or poor connection.
3. Faulty TCM: The Transmission Control Module may have internal faults that cause it to not function correctly.
4. Blown Fuse: A blown fuse in the power supply circuit could interrupt power to the TCM.
5. Battery Voltage Issues: Low voltage or poor battery connections can affect the power supply to the TCM.
6. Ground Issues: Poor grounding can lead to insufficient power reaching the TCM.

Manufacturer-Specific Differences:
1. Porsche: In some Porsche models, the issue may also involve the vehicle`s CAN bus system, which communicates between various modules.
2. Mini: For Mini vehicles, a common issue could be related to the Integrated Control Unit (ICU) affecting the TCM.
3. Mercedes: In Mercedes vehicles, the problem might also be linked to the transmission wiring harness, which can be prone to wear and tear.
4. Audi: Audi models may have additional software issues that can trigger this code, requiring a software update or reprogramming.
5. Jaguar: In Jaguars, the issue could stem from the gear selector mechanism, which may not properly communicate with the TCM.
6. Land Rover: Land Rover vehicles might experience this code due to issues with the Terrain Response system, affecting how the TCM operates.


If you encounter code P0885, it`s essential to perform a thorough diagnosis. Check the relay, wiring, and the TCM itself, and consider manufacturer-specific quirks that might affect the system. Always consult your vehicle`s service manual for specific troubleshooting steps.
The Engine Fault Code P0885 indicates an issue with the Transmission Control Module (TCM) power relay control circuit. This can lead to transmission problems, so its important to address it. Heres a general guide on how to fix this issue, along with some manufacturer-specific notes:

General Steps to Diagnose and Fix P0885

1. Check the Battery Voltage:
– Ensure the battery is fully charged. Low voltage can cause relay issues.

2. Inspect Fuses:
– Check the fuses related to the TCM and transmission. Replace any blown fuses.

3. Examine the TCM Relay:
– Locate the TCM relay in the fuse box or relay panel.
– Test the relay by swapping it with another relay of the same type (if available) or using a multimeter.

4. Inspect Wiring and Connectors:
– Look for damaged, frayed, or corroded wires in the TCM power relay circuit.
– Check the connectors for corrosion or loose connections. Clean or repair as necessary.

5. Test the TCM:
– If the relay and wiring are fine, the TCM itself might be faulty.
– You may need a professional scan tool to check for additional codes or to perform a TCM reset.

6. Clear the Code:
– After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.

Manufacturer-Specific Notes

#Porsche
– Model-Specific Issues: Some Porsche models may have unique relay locations or TCM designs. Refer to the service manual for specifics.

#Mini
– Common Failures: Mini vehicles often have issues with the TCM connectors. Ensure they are secure and free from moisture.

#Mercedes-Benz
– Control Module: Mercedes may require coding or programming after a TCM replacement. Consult with a dealer or a specialized mechanic.

#Audi
– Relay Location: Audi models might have the TCM relay located in different areas, so refer to the owners manual for exact locations.

#Jaguar
– Software Updates: Jaguar vehicles sometimes need software updates for the TCM. Check with a dealer for any updates.

#Land Rover
– Complex Systems: Land Rover vehicles often have intricate electrical systems. If basic checks dont solve the issue, professional diagnostics may be needed.

Conclusion
Fixing the P0885 code involves checking the battery, fuses, relay, wiring, and possibly the TCM itself. Always refer to the specific service manual for your vehicle for the most accurate information. If youre unsure or the problem persists, its best to consult with a professional mechanic.
Driving with a P0885 code, which indicates an issue with the Transmission Control Module (TCM) power relay circuit, is generally not safe. This code means there`s a problem with the relay that powers the TCM, which can lead to transmission issues. Heres a breakdown of what it might mean for different manufacturers:

General Risks:
1. Transmission Problems: You may experience shifting issues, such as slipping or not shifting at all.
2. Stalling: The car may stall or fail to start.
3. Warning Lights: The check engine light will likely be on, indicating a problem.

Manufacturer-Specific Considerations:

1. Porsche:
– May enter `limp mode,` restricting power and speed.
– It`s best to avoid driving until fixed.

2. Mini:
– Similar to Porsche, it can lead to limp mode.
– Driving could cause further damage to the transmission.

3. Mercedes:
– May cause erratic shifting or no shifting.
– Driving is risky, and repairs should be made ASAP.

4. Audi:
– Can lead to overheating or increased wear on transmission components.
– Avoid driving until the issue is resolved.

5. Jaguar:
– Can cause significant transmission issues.
– Driving is not recommended due to potential damage.

6. Land Rover:
– May cause loss of power to the transmission.
– It`s advisable to get it checked immediately.


In most cases, it`s not safe to drive with a P0885 code. It`s best to have the vehicle inspected by a qualified mechanic. Ignoring this issue can lead to more severe and costly problems down the line.

OBD Codes Explained

Engine Codes

P is for PowerTrain - Engine and Transmission.

P0 Indicates Generic Powertrain Codes

P0 Codes indicate problems with the powertrain and are common for all vehicles using the OBD-II Standard.

P1 Enhanced Manufacturer Specific Codes

P1 Codes are specific to manufacturers.

Sub-System

The 3rd Digit indicates the Sub-System

1 – Emission Management

2 – Injector Circuit

3 – Ignition

4 – Emission Control

5 – Vehicle Speed and Idle

6 – Computer and Output

7 – Transmission

8 – Transmission

9 – Reserved

0 – Reserved

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