OBD-II Generic Error Code P2747: How to Fix Intermediate Shaft Speed Sensor B No Signal

Medium 1-2 hours Medium Severity Verified June 2026
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Error Code
P2747
Brand
OBD-II Generic
Product Type
automotive
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Error code P2747 means the powertrain control module (PCM) has detected no signal from the intermediate shaft speed sensor B. This sensor monitors the speed of the countershaft in automatic transmissions, and its failure can cause shifting problems, limp mode, or a check engine light.
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Tools You'll Need

How to Fix Error Code P2747

  1. Check Diagnostic Trouble Codes (DTCs)

  2. Inspect Wiring and Connector

    Disconnect the battery before working on electrical components.

  3. Test the Sensor Resistance

  4. Replace the Intermediate Shaft Speed Sensor B

    Ensure the transmission fluid is at the correct level after replacement; top up if necessary.

  5. Clear Codes and Test Drive

Parts You May Need

Intermediate shaft speed sensor B
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O-ring (for sensor)
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Intermediate shaft speed sensor B
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O-ring (for sensor)
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Intermediate shaft speed sensor B
Check Price on Amazon
O-ring (for sensor)
Check Price on Amazon
Intermediate shaft speed sensor B
Check Price on Amazon
O-ring (for sensor)
Check Price on Amazon
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When to Call a Professional

If the code returns after sensor replacement, there may be an internal transmission issue (e.g., damaged gear teeth, valve body problem) or a PCM fault. A professional mechanic with transmission diagnostic equipment should inspect the vehicle.

Frequently Asked Questions

Can I drive with error code P2747?
It is not recommended. The transmission may go into limp mode, limiting speed and causing erratic shifting. Continued driving could damage the transmission.
Where is the intermediate shaft speed sensor B located?
It is typically mounted on the transmission case, near the output shaft or countershaft. Refer to your vehicle's service manual for exact location.
What causes a P2747 code?
Common causes include a faulty sensor, damaged wiring or connector, low transmission fluid, or debris on the sensor. In rare cases, a PCM failure or internal transmission damage.
How much does it cost to fix P2747?
If DIY, the sensor costs $20-$100. Professional repair can range from $150 to $400 depending on labor and parts.
Will clearing the code fix the problem?
No, clearing the code only removes the warning; the underlying issue will cause it to return. You must repair the fault.

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