TCM Power Relay Sense Circuit Range/Performance

Where it lives

For P0889, the part to look at first is the relay named here.

Check these first

• A failing TCM power relay
• An open or short in the relay sense circuit
• A poor ground at the relay or TCM
• Low voltage at the TCM during cranking

What to do next

1. Inspect the TCM power relay and its fuse
2. Check the relay sense circuit for opens and shorts
3. Measure voltage at the TCM during cranking
4. Check relay and TCM grounds for corrosion
5. Replace the relay if the circuit tests good
6. Clear the code and retest

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