P0EC6 code meaning
A/C Power Supply Relay Control Circuit/Open
What P0EC6 means
P0EC6 concerns the control side of the relay that switches power to air conditioning components, typically the compressor or climate electronics. The module driving the relay coil notices that its output does not behave as commanded, most often because the coil circuit is open. No manufacturer documents P0EC6 publicly, and the exact wiring differs by maker. CARB requires output components to be checked either functionally or for circuit continuity and shorts, and lets manufacturers report open and shorted states under one code, which is the role of this umbrella code. A relay that never pulls in leaves the A/C without power. Voltage-specific faults: P0EC7 and P0EC8; the clutch relay equivalent is P0645.
P0EC6 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0EC6
- A/C or electric compressor completely without function
- No relay click when A/C is requested
Common causes of P0EC6
- Most likelyRelay coil burnt open or relay missing
- PossibleOpen control wire or loose relay socket terminal
- Less likelyFailed output driver in the controlling module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ac power supply relayHvac control moduleWiring harness
What each part of P0EC6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C6 | The exact fault in that area. |
What to do next
- Note P0EC6 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 P0EC6
What does P0EC6 mean?
P0EC6 means "A/C Power Supply Relay Control Circuit/Open". P0EC6 concerns the control side of the relay that switches power to air conditioning components, typically the compressor or climate electronics. It is a generic code, so it means the same on every make.
Is it safe to drive with P0EC6?
P0EC6 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0EC6 fail an emissions test?
P0EC6 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 P0EC6 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0EC6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.