P0A06 code meaning
Motor Electronics Coolant Pump A Control Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A06 means
The control line of pump A in the drive electronics coolant loop sits at a voltage below what the module expects for the commanded state, usually because the line or the pump input is shorted to ground. Depending on the driver design, the pump then runs uncontrolled or not at all. No manufacturer documents P0A06 publicly; GM's Volt reports a short of the comparable pump control line under P0CE9 (16 of 20 samples at 250 ms, Type B). CARB requires circuit checks of inverter cooling outputs, and Toyota patents show why a failed pump must be separated from radiator or fan faults. P0A05 is the open case, P0A07 the short to voltage. A failing pump soon leads to power reduction.
P0A06 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A06
- Hybrid system or check engine light
- Electronics temperature rising quickly, power limited
- Pump silent when commanded on, or running continuously
Common causes of P0A06
- Most likelyControl wire chafed against the body and shorted to ground
- PossibleInternal short at the pump's control input
- PossibleWater or coolant in the pump connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Motor electronics coolant pump aWiring harnessHybrid control module
What each part of P0A06 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 06 | The exact fault in that area. |
What to do next
- Note P0A06 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 P0A06
What does P0A06 mean?
P0A06 means "Motor Electronics Coolant Pump A Control Circuit Low". The control line of pump A in the drive electronics coolant loop sits at a voltage below what the module expects for the commanded state, usually because the line or the pump input is shorted to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A06?
Drive gently and only to a workshop. With P0A06 the car can go into limp mode (reduced power) to protect itself.
Will P0A06 fail an emissions test?
Yes, it can. P0A06 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 P0A06 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P0A06 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.