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P0885 OBD2: TCM Power Relay Control Circuit/Open

P0885 OBD2: TCM Power Relay Control Circuit/Open

The P0885 OBD-II code indicates an issue with the Transmission Control Module (TCM) power relay control circuit. This code is triggered when the TCM does not receive the proper voltage necessary for its operation, leading to potential issues with the vehicle’s transmission performance.

What Does the P0885 Code Mean?

The P0885 code specifically means that there is a fault in the power relay that controls the TCM. When the TCM fails to receive the required voltage, it communicates this to the engine control module (PCM), resulting in the P0885 code being set.

What Causes the P0885 Code?

Several factors can lead to the P0885 code being triggered, including:

  • Transmission Control Module (TCM) failure
  • Failure of the TCM relay
  • Wiring issues or damaged connections

What Are the Symptoms of the P0885 Code?

When the P0885 code is present, drivers may notice the following symptoms:

  • Transmission may not shift properly
  • Increased fuel consumption

How Serious Is the P0885 Code?

The P0885 code is considered to be of moderate severity. While it may not pose an immediate threat to vehicle safety or functionality, it is important to have it diagnosed and repaired in a reasonable timeframe to prevent further complications with the transmission system.

How to Diagnose the P0885 Code

Proper diagnosis of the P0885 code typically involves the following steps:

  1. Using an OBD-II scanner to confirm the presence of the P0885 code and any additional codes.
  2. Inspecting the TCM and its wiring for any visible damage or corrosion.
  3. Testing the TCM relay to ensure it is functioning correctly.
  4. Checking the voltage supply to the TCM to confirm it is receiving the necessary power.

Common Repairs for the P0885 Code

Repairs for the P0885 code may include:

  • Replacing a faulty Transmission Control Module (TCM)
  • Replacing a defective TCM relay
  • Repairing or replacing damaged wiring or connectors

How Much Does It Cost to Fix the P0885 Code?

The cost to fix the P0885 code can vary widely depending on the specific issue. On average, repairs may range from $100 to $500, with more extensive repairs involving replacement of the TCM or related components potentially costing more.

Can I Fix the P0885 Code Myself?

While some DIY enthusiasts may be able to perform basic inspections and repairs, diagnosing and fixing the P0885 code can be complex. It is recommended to seek assistance from a professional mechanic, especially if you are not experienced with automotive electrical systems.

About JC Landry

JC is the Senior Editor at eManualOnline.com, GarageSpot.com, and Drive-My.com, as well as the Webmaster of TheMechanicDoctor.com, only to name a few. He's been a certified Master Mechanic for 15 years, working for various car dealers and specialized repair shops before turning towards blogging about cars and EVs in the hope of helping the next generation of automotive technicians. He also loves cats, Johnny Cash and Subarus.

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