OBD-II code · Network
U04A0 Invalid Data Received From Engine Coolant Pump Control Module
A receiving module detected implausible data from the engine coolant pump (electric water pump) control module. Pump speed or flow values fail plausibility checks and are rejected.
Is it safe to drive with U04A0?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule internal fault or sensor input drift
- PossibleSoftware version mismatch after replacement
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Engine Coolant Pump Module
Related codes
- U049DInvalid Data Received From Glow Plug Control Module 2
- U049EInvalid Data Received From Direct Ozone Reduction Catalyst Temperature Sensor
- U049FInvalid Data Received From Transmission Range Control Module
- U04A1Invalid Data Received From Hybrid/EV Battery Interface Control Module A
- U04A2Invalid Data Received From Hybrid/EV Battery Interface Control Module B
- U04A3Invalid Data Received From Hybrid/EV Battery Interface Control Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.