What Does P022E Mean?
The charge air cooler bypass control valve B circuit is reading consistently low voltage, indicating a short to ground. The ECM detects that the valve circuit is being pulled to ground when it should not be, preventing normal modulation. This can cause the valve to remain energized or the ECM to disable it entirely, impacting charge air cooling for bank 2.
Common Causes
35%
Short to ground in the bypass valve B control wire
25%
Bypass valve B solenoid internally shorted to ground
20%
Corroded valve connector with moisture intrusion creating ground path
12%
Wiring harness pinched or chafed against grounded engine component
8%
ECM output driver shorted internally
Diagnostic Steps
1
Disconnect the bypass valve B connector and check if the circuit voltage returns to normal (5V or 12V per design). If it does, the valve itself is shorted.
2
With the valve disconnected, measure resistance between the control wire and chassis ground at the ECM connector — high resistance (>10 kΩ) is normal; low resistance indicates a harness short.
3
Measure valve B coil resistance — should be 8–15 Ω. A reading below 3 Ω suggests an internal short.
4
Visually inspect the harness along its routing path from the ECM to valve B, focusing on areas near hot exhaust components, sharp brackets, or moving parts.
5
If the harness and valve test good, use a scan tool to command the valve and monitor ECM output — if the ECM pin is stuck low, the internal driver may be damaged.
Estimated Repair Cost
$150 - $500
Parts + labor, varies by vehicle and location
The charge air cooler bypass control valve B circuit is reading consistently low voltage, indicating a short to ground. The ECM detects that the valve circuit is being pulled to ground when it should not be, preventing normal modulation. This can cause the valve to remain energized or the ECM to dis...
The most common cause of P022E (Charge Air Cooler Bypass Control "B" Circuit Low) is: Short to ground in the bypass valve B control wire
Typical repair costs for P022E range from $150 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Drive conservatively and avoid sustained high boost. A shorted bypass valve circuit can leave charge air management in an unknown state, increasing the risk of knock under load. Not immediately dangerous at light load, but avoid heavy acceleration until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P022E to identify the root cause.
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Quick Info
Category
Powertrain
System
Turbocharger / Supercharger System
Difficulty
Type
Generic (SAE)
Recommended Tools
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