U062F code meaning
Lost Communication With Coolant Pump C
Network system Generic code U06xx codes Check engine light
What U062F means
GM assigns coolant pump C to the pump of its low-temperature coolant loop, a separate circuit that runs well below engine temperature. The 2020 table 20OBDG04 fails U062F once LIN communication errors reach three counts, provided the bus itself is not already faulted (U1345), the pump is configured as present and run/crank voltage is at least 11 V. In 2025 (25OBDG04A) the test watches the pump's response frame CWP_Rsp and fails after 2.5 s without it. Both versions are Type B, so the MIL comes on after two trips. If the pump stays silent, the loop loses its circulation and the parts it cools can run hotter. Electric pumps like Bosch's PDE receive their speed command over LIN or PWM and report their own diagnosis.
U062F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U062F
- Check engine light after two trips
- Parts on the low-temperature loop may run hotter than normal
Common causes of U062F
- Most likelyLIN wire, supply or ground to the low-temperature loop pump damaged
- PossibleCorroded or loose pump connector
- PossiblePump electronics failed
- Less likelyLIN master in the engine controller faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant pump cVehicle bus wiring
What each part of U062F means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2F | The exact fault in that area. |
What to do next
- Note U062F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U062F
What does U062F mean?
U062F means "Lost Communication With Coolant Pump C". GM assigns coolant pump C to the pump of its low-temperature coolant loop, a separate circuit that runs well below engine temperature. It is a generic code, so it means the same on every make.
Is it safe to drive with U062F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U062F fail an emissions test?
Yes, it can. U062F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U062F to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will U062F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.