OBD-II Generic Error Code P0898: How to Fix It

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P0898
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P0898 indicates a low voltage condition in the transmission control system's MIL (Malfunction Indicator Lamp) request circuit. This means the transmission control module (TCM) is reporting a problem that triggers the check engine light. The issue is often related to wiring, connectors, or the TCM itself.
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Tools You'll Need

How to Fix Error Code P0898

  1. Check for Other Codes

    Ensure the ignition is off before connecting the scanner.

  2. Inspect Wiring and Connectors

    Disconnect the battery before working on electrical components.

  3. Check Voltage at TCM

    Be careful not to short pins.

  4. Test the MIL Bulb or LED

    Consult your vehicle's service manual for cluster removal.

  5. Replace TCM if Necessary

    TCM replacement is complex and may require professional programming.

Parts You May Need

Check engine light bulb or LED
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Transmission Control Module (TCM)
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Check engine light bulb or LED
Check Price on Amazon
Transmission Control Module (TCM)
Check Price on Amazon
Check engine light bulb or LED
Check Price on Amazon
Transmission Control Module (TCM)
Check Price on Amazon
Check engine light bulb or LED
Check Price on Amazon
Transmission Control Module (TCM)
Check Price on Amazon
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When to Call a Professional

If you are not comfortable with electrical diagnostics or if the TCM needs replacement and programming, consult a professional mechanic.

Frequently Asked Questions

What does error code P0898 mean?
P0898 means the transmission control module (TCM) detects a low voltage condition in the MIL (check engine light) request circuit.
Can I drive with P0898?
You can drive short distances, but it's best to diagnose and fix the issue soon. The check engine light will be on, and underlying transmission problems may worsen.
What causes P0898?
Common causes include damaged wiring, loose connectors, faulty MIL bulb, or a defective TCM.
Will disconnecting the battery reset P0898?
It may clear the code temporarily, but if the underlying issue persists, the code will return.
How much does it cost to fix P0898?
DIY repair can cost under $50 for parts like bulbs or wiring. Professional diagnosis and TCM replacement can range from $200 to $1000+.

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