Invalid Data Received From Coolant Pump Module
The U0477 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Coolant Pump Module. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,200 (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
- Engine overheating warning
- Electric coolant pump not running
- Coolant temperature erratic
- Reduced power due to overheating
Probable Causes (Ranked by Likelihood)
- Failed electric coolant pump module Very High
- Coolant pump motor failure High
- CAN bus data error Moderate
- Low coolant level affecting pump Low
Step-by-Step Diagnostic Procedure
-
Check coolant level
-
Test coolant pump operation
-
Scan coolant pump module
-
Verify CAN bus at pump module
Frequently Asked Questions
Can I drive with U0477?
Only very short distances. Monitor temperature gauge closely and stop if overheating.
What causes U0477?
Usually a failed electric coolant pump or low coolant level.
How much to fix?
Between $300 and $1,200.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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