OBD-II code · Network
U019F Lost Communication With Engine Coolant Pump Control Module
ECU lost communication with the electric coolant pump control module. A communication loss with this module breaks any function relying on its data — diagnostic tools may show 'no response' and dependent modules can fall into limp mode.
Is it safe to drive with U019F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
- Often, with basic tools
- Typical labour
- 0.5–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Coolant Pump Module, Can Bus
Related codes
- U019CLost Communication With Glow Plug Control Module 2
- U019DLost Communication With Direct Ozone Reduction Catalyst Temperature Sensor
- U019ELost Communication With Transmission Range Control Module
- U01A0Lost Communication With Hybrid/EV Battery Interface Control Module A
- U01A1Lost Communication With Hybrid/EV Battery Interface Control Module B
- U01A2Lost Communication With Hybrid/EV Battery Interface Control Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.