U014C code meaning
Lost Communication With Battery Energy Control Module D
Network system Generic code U01xx codes Check engine light
What U014C means
U014C is the fourth slot in the battery controller family and points at module D. Such a letter is only needed where a pack is split into many sub-packs with their own monitoring boards, or where a vehicle carries an extra battery, for example a second traction pack or a separate 48 V unit, each reporting to a master controller. The master or the hybrid controller logs U014C once D's frames stop. No manufacturer explains the code publicly. As a guide, GM rates the comparable U0111 for module A as a Type B fault in its 2018 hybrid tables after a 500 ms gap, so a MIL is plausible here too. While D is silent, its cells cannot be supervised; the system will usually cut power, open contactors or refuse charging to stay safe. U0111, U0112 and U014A cover modules A to C.
U014C at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U014C
- Battery or hybrid system warning
- Reduced drive power or no ready mode
- Charging not possible
Common causes of U014C
- Most likelySupply or ground of battery module D missing
- PossibleInternal pack communication line or connector to D faulty
- Less likelyBattery module D internally faulty
- Less likelyMaster controller configured for a module D that does not match
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Battery energy module dCAN bus
What each part of U014C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4C | The exact fault in that area. |
What to do next
- Note U014C 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 U014C
What does U014C mean?
U014C means "Lost Communication With Battery Energy Control Module D". U014C is the fourth slot in the battery controller family and points at module D. It is a generic code, so it means the same on every make.
Is it safe to drive with U014C?
Drive gently and only to a workshop. With U014C the car can go into limp mode (reduced power) to protect itself.
Will U014C fail an emissions test?
U014C 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 U014C to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will U014C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.