Invalid Data Received From Compass Module
The U0491 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Compass Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $50 - $300 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Compass showing wrong direction
- Compass reading stuck
- Compass not calibrating
- Compass display blank
Probable Causes (Ranked by Likelihood)
- Compass module failure Very High
- Magnetic interference near sensor High
- CAN bus data error Moderate
- Compass calibration lost Low
Step-by-Step Diagnostic Procedure
-
Recalibrate compass by driving in circles
-
Check for magnetic interference
-
Scan compass module
-
Reset module and recalibrate
Frequently Asked Questions
Can I drive with U0491?
Yes. Use your phone for navigation direction.
What causes U0491?
Often magnetic interference from aftermarket accessories or a compass needing recalibration.
How much to fix?
Typically $50 to $300. Recalibration is often free.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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