P0886 Fault Code

TCM Power Relay Control Circuit Low

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0886 fault code indicates a problem with the TCM (Transmission Control Module) power relay control circuit, which is functioning at a low voltage or is unable to provide sufficient power. This fault can lead to transmission issues as the TCM relies on stable power for proper operation.

What are the symptoms of the P0886 code?

Common symptoms associated with the P0886 code may include:

• Transmission slipping or erratic behavior such as unexpected shifts.
• The check engine light illuminated on the dashboard.
• Difficulty in shifting gears.
• Reduced engine power due to safety protocols triggered by transmission issues.

What causes the P0886 code?

Several factors can contribute to the P0886 code, including:

• A faulty TCM power relay that fails to deliver adequate voltage.
• Wiring issues such as shorts, breaks, or corrosion in the relay circuit.
• A malfunctioning TCM that does not respond correctly to the power relay signals.
• Poor battery or alternator performance affecting the entire electrical system.

How to fix P0886?

To resolve the P0886 fault code, consider the following steps:

• Inspect the TCM power relay for signs of damage or wear and replace if necessary.
• Check all wiring and connectors for continuity, ensuring there are no shorts or disconnections.
• Test the voltage supply to the TCM from the relay, confirming it meets the specifications outlined in the vehicle's service manual.
• If all components appear functional, consider reprogramming or replacing the TCM if it is determined to be faulty.