P0890 — TCM Power Relay Sense Circuit Low

What Does P0890 Mean?

P0890 is a diagnostic trouble code indicating: TCM Power Relay Sense Circuit Low. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0890

⚠️ Check Engine Light (MIL) illuminated
⚠️ TCM Power Relay Sense reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Harsh or delayed shifting

Common Causes

🔍 Open or broken wire in TCM Power Relay Sense circuit
🔍 Poor ground connection at TCM Power Relay Sense
🔍 Faulty TCM Power Relay Sense with no output signal
🔍 Disconnected or loose TCM Power Relay Sense connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P0890 mean?

P0890 indicates: TCM Power Relay Sense Circuit Low. The vehicle's computer has detected that the TCM Power Relay Sense is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0890?

Only short distances if absolutely necessary. P0890 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P0890?

Repair costs for P0890 typically range from $20 to $500, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in TCM Power Relay Sense circuit
🔧 Clean and secure TCM Power Relay Sense connector and ground points
🔧 Replace failed TCM Power Relay Sense

1
Find your vehicle above
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P0890: TCM Power Relay Sense Circuit Low