What Does P022F Mean?
The charge air cooler bypass control valve B circuit is reporting a consistently high voltage when the ECM is commanding it low. This typically indicates the ECM cannot ground the valve to activate it, due to an open control wire, failed driver, or short to voltage. The valve remains in its default position, reducing charge air temperature management capability on bank 2.
Common Causes
30%
Open circuit in the control wire from ECM to bypass valve B
25%
Short to battery voltage in the valve B control circuit
20%
Bypass valve B solenoid coil failed open
15%
ECM driver circuit failure (cannot pull low)
10%
Corroded or backed-out pins at the valve connector
Diagnostic Steps
1
Measure voltage at the bypass valve B connector with key on — the control wire should toggle between ~12V (off) and ~0V (commanded on). If it stays high regardless of command, the control path is broken.
2
Measure valve coil resistance (8–15 Ω expected). Open reading confirms internal valve failure.
3
Check continuity of the control wire from the ECM connector to the valve connector — should be under 2 Ω.
4
With the valve unplugged, command the valve on via scan tool and probe the ECM control pin — it should drop near 0V. If it stays high, the ECM driver is faulty.
5
Inspect the harness for areas where the control wire routes near B+ feeds and could have insulation damage causing a short to voltage.
Estimated Repair Cost
$150 - $550
Parts + labor, varies by vehicle and location
The charge air cooler bypass control valve B circuit is reporting a consistently high voltage when the ECM is commanding it low. This typically indicates the ECM cannot ground the valve to activate it, due to an open control wire, failed driver, or short to voltage. The valve remains in its default ...
The most common cause of P022F (Charge Air Cooler Bypass Control "B" Circuit High) is: Open circuit in the control wire from ECM to bypass valve B
Typical repair costs for P022F range from $150 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Avoid high-load driving. The valve stuck in its default position compromises charge air cooling on bank 2. The ECM may reduce boost as a safeguard. Not an immediate breakdown risk at normal loads, but avoid towing or sustained high-RPM operation until fixed.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P022F 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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