P0889 Fault Code

TCM Power Relay Sense Circuit Range/Performance

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

The P0889 code indicates an issue with the TCM (Transmission Control Module) Power Relay Sense Circuit. This means that the circuit is experiencing performance issues or is out of range. The TCM relies on this relay to supply power to its various components, enabling proper functioning of the transmission system.

What are the symptoms of the P0889 code?

Symptoms associated with the P0889 code can vary but may include:

• Transmission malfunction or erratic shifting
• Difficulty in engaging gears
• Illumination of the check engine light
• Possible limp mode activation, leading to limited vehicle speed

What causes the P0889 code?

Common causes of the P0889 code include:

• Faulty TCM power relay
• Damaged wiring or connectors in the sense circuit
• Poor ground connection to the relay
• Faulty TCM that may not be responding correctly
• Faulty fuses associated with the power relay circuit

How to fix P0889?

To resolve the P0889 code, technicians typically follow these steps:

• Inspect and test the TCM power relay for proper operation.
• Check wiring and connectors for signs of damage or corrosion.
• Ensure that the ground connections are clean and secure.
• Replace any faulty components identified during diagnostics.
• Clear the codes and test drive the vehicle to see if the issue reoccurs.