Invalid Data Received From Auxiliary Heater Coolant Pump
The U0500 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Auxiliary Heater Coolant Pump. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600
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
- Cabin heater slow to warm
- Auxiliary heater inoperative
- Coolant temperature inconsistency
- Climate control warning message
Probable Causes (Ranked by Likelihood)
- Auxiliary coolant pump failure Very High
- Wiring harness damage near pump High
- CAN bus signal interference Moderate
- Control module software glitch Low
Step-by-Step Diagnostic Procedure
-
Check auxiliary coolant pump operation
-
Inspect wiring harness to pump
-
Monitor CAN bus signals from pump module
-
Update control module software
Frequently Asked Questions
Can I drive with U0500?
Check the severity. If it affects safety systems like stability control or braking, limit driving to short distances. Comfort features like heaters or parking assist are safe to drive with.
What causes U0500?
Most commonly a faulty auxiliary heater coolant pump or damaged wiring in the communication circuit to that module.
How much does it cost to fix U0500?
Typical repair costs range from $150 - $600 depending on whether the module or just wiring needs repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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