What Does P001B Mean?
The PCM has detected that the Bank 1 intake (A) camshaft profile control solenoid circuit voltage is below the expected threshold. This low-side circuit fault indicates a short to ground in the wiring, a partially shorted solenoid coil, or excessive resistance causing voltage drop. The cam profile switching system cannot operate correctly.
Common Causes
35%
Short to ground in the wiring harness between the PCM and the camshaft profile solenoid
30%
Internally shorted camshaft profile solenoid coil with reduced resistance
20%
Corroded ground connection causing incorrect voltage reading at the PCM
10%
Water intrusion in the solenoid connector causing partial short
5%
PCM sensing circuit error or damaged input pin
Diagnostic Steps
1
Disconnect the Bank 1 intake cam profile solenoid and measure coil resistance — values below the manufacturer specification (typically 14-30 ohms) indicate internal coil short
2
With the solenoid disconnected, measure resistance from each solenoid wire to chassis ground — any reading below 10K ohms indicates a short to ground in the harness
3
Inspect the wiring harness routing for chafing against sharp edges, especially near the valve cover and exhaust manifold heat sources
4
Check voltage at the solenoid connector pins with KOEO — supply wire should show battery voltage, control wire should show 5V or battery voltage (depends on system)
5
If wiring is intact, swap the solenoid with the Bank 2 unit (if equipped) to confirm whether the fault follows the solenoid
Estimated Repair Cost
$80 - $500
Parts + labor, varies by vehicle and location
The PCM has detected that the Bank 1 intake (A) camshaft profile control solenoid circuit voltage is below the expected threshold. This low-side circuit fault indicates a short to ground in the wiring, a partially shorted solenoid coil, or excessive resistance causing voltage drop. The cam profile s...
The most common cause of P001B ("A" Camshaft Profile Control Circuit Low Bank 1) is: Short to ground in the wiring harness between the PCM and the camshaft profile solenoid
Typical repair costs for P001B range from $80 to $500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The cam profile will default to a safe mode, reducing high-RPM power. No immediate safety risk, but the check engine light will be on and the vehicle will have reduced performance.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P001B to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing / Cam Profile Switching System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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