What Does P022A Mean?
The charge air cooler (intercooler) bypass control valve A circuit has an open circuit condition. This valve directs boost air either through or around the intercooler to manage charge air temperature. When the circuit is open, the valve cannot be controlled, potentially leaving it in one position. The driver may notice reduced performance, increased intake temperatures, or detonation under heavy load.
Common Causes
30%
Open circuit in the wiring harness between the ECM and the bypass control valve A
30%
Failed charge air cooler bypass control valve A (internal coil open)
20%
Disconnected or corroded valve connector
12%
Blown fuse or relay in the valve control circuit
8%
ECM driver circuit failure for the bypass valve output
Diagnostic Steps
1
Locate the charge air cooler bypass valve A and verify the electrical connector is fully seated and not damaged. Check for signs of heat damage or melting.
2
Measure the valve solenoid coil resistance — typical range is 8–15 Ω. An open reading (OL) confirms internal coil failure and the valve must be replaced.
3
Check for 12V supply at the valve connector with key on — if absent, trace the power feed circuit, checking the associated fuse and relay.
4
Verify continuity of the control wire from the ECM connector to the valve connector — should be under 2 Ω. An open circuit confirms a wiring break.
5
If wiring and valve test good, use a scan tool to command the valve on and off while measuring voltage at the connector to verify the ECM driver is switching properly.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The charge air cooler (intercooler) bypass control valve A circuit has an open circuit condition. This valve directs boost air either through or around the intercooler to manage charge air temperature. When the circuit is open, the valve cannot be controlled, potentially leaving it in one position. ...
The most common cause of P022A (Charge Air Cooler Bypass Control "A" Circuit Open) is: Open circuit in the wiring harness between the ECM and the bypass control valve A
Typical repair costs for P022A range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Reduce load and avoid aggressive driving. Without bypass control, charge air temperatures may be too high under boost, risking detonation/knock which can damage pistons and bearings. The ECM may pull timing to compensate, but sustained high-load driving should be avoided until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P022A to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
