U010F code meaning
Lost Communication With Air Conditioning Control Module
What U010F means
U010F is logged when the air conditioning control module stops reporting. J2012 keeps it apart from the HVAC control module (U0164): the A/C unit governs the refrigerant side, such as compressor clutch or electric compressor drive and pressures, while the HVAC module handles blower, flaps and temperature choice. Saab's 2011 code lists for the 9-5 and 9-4x carry U010F 00 next to U0164 00, which documents GM/Saab use. Neither list gives a threshold; Saab's general U0100–U02FF procedure applies, a missing state-of-health message at 9–16 V. The compressor then usually stays off, so cooling and demisting are lost; the engine is not affected and no MIL is expected. U040A covers invalid data from the same module.
U010F at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U010F
- Air conditioning does not cool
- Windows fog up, demisting weak
- No MIL
Common causes of U010F
- Most likelyA/C module without power or ground (fuse, connector)
- PossibleDamaged bus lines to the A/C module
- PossibleCondensate or water at module or connector
- Less likelyA/C module internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hvac control moduleCAN bus wiring
What each part of U010F means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0F | The exact fault in that area. |
What to do next
- Note U010F 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 U010F
What does U010F mean?
U010F means "Lost Communication With Air Conditioning Control Module". U010F is logged when the air conditioning control module stops reporting. It is a generic code, so it means the same on every make.
Is it safe to drive with U010F?
U010F does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U010F fail an emissions test?
U010F is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U010F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U010F clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.