What it means
The driver stage for the A/C refrigerant distribution valve A is in current limit or over-temperature. Sustained overload from a partially shorted load or excessive switching frequency.
At a glance
- Usually lights the check-engine light
How it works
The control module's driver for A/C refrigerant distribution valve A switches current through the valve coil and monitors the load and driver temperature. This code sets when the driver reaches a current limit or overheats, potentially because the coil is partly shorted or the module is not cooling properly.
Common causes
Most likely first.
- Partial short in valve coil
- Module overheating from poor cooling
Symptoms
- Check-engine light
- A/C may not cool properly
How to diagnose it
- Record freeze-frame data and check whether the fault occurs when A/C valve A is commanded, noting any related A/C or module temperature faults.
- Inspect valve A's connector and wiring for heat damage, corrosion, pinched insulation, or a short between wires.
- With the system safely powered down as directed by the manufacturer, test valve A's coil and circuit for a partial short against the manufacturer's specification.
- Check whether the module's cooling path, mounting, and nearby airflow are obstructed or damaged.
- If the valve circuit and cooling are sound, follow the manufacturer's procedure to evaluate the module driver under command.
Common fixes
- Repair damaged or shorted wiring at A/C refrigerant distribution valve A.
- Replace valve A if its coil tests as partially shorted.
- Restore the module's specified cooling and mounting conditions if airflow or heat transfer is impaired.
- Repair or replace the control module if its driver overheats with a correct valve load and adequate cooling.
Can I keep driving?
The A/C may cool poorly or shut down, but this fault alone does not usually indicate an immediate engine safety issue. Turn off the A/C if you notice abnormal heat, electrical smell, or worsening electrical symptoms.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.