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DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P001A

P001AA Camshaft Profile Actuator A Control Circuit/Open Bank 1

P001A indicates that the powertrain control module has detected an open circuit in the control wiring for the bank 1 camshaft profile actuator, which is the solenoid that moves the camshaft to change valve lift or duration. The computer commands the actuator to change cam profile but sees no current flow or an unexpected voltage on the control circuit, so it flags the circuit as open.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering and auxiliary emission controls

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Reduced engine power or a limp-home mode because the cam profile cannot change
  • Rough idle or poor low-speed drivability due to incorrect valve timing
  • Decreased fuel economy and higher emissions during the failed actuation
  • In some vehicles, a brief rattle or knock on startup if the actuator defaults to a fixed position

Common causes, most likely first

  1. Broken, chafed, or disconnected wire in the actuator control circuit
  2. Corroded or loose electrical connector at the camshaft profile actuator
  3. Failed camshaft profile actuator solenoid with an open internal coil
  4. Open circuit inside the powertrain control module driver for that actuator
  5. Poor ground connection shared by the actuator circuit
  6. Aftermarket or damaged wiring harness from previous repairs

How to diagnose and fix it

  1. Verify the code with a scan tool and check for any related camshaft position or actuator performance codes
  2. Inspect the actuator connector and wiring for damage, corrosion, or loose pins, and repair as needed
  3. Measure resistance across the actuator solenoid terminals and compare to the manufacturer's specification
  4. Check for battery voltage and ground on the control circuit with the key on and the actuator commanded
  5. Perform a wiggle test on the harness while monitoring actuator command and circuit status on the scan tool
  6. If the circuit is intact, substitute a known-good actuator or test the control module output with a noid light
  7. Clear the code and verify the repair with a road test that commands cam profile changes

What the open circuit really means

  • An open circuit code does not always mean the actuator is dead; a backed-out terminal or broken wire a few inches from the connector is just as common.
  • Some vehicles set P001A when the actuator is unplugged during service, so check for recent repairs before replacing parts.
  • The camshaft profile actuator shares power or ground with other solenoids on some engines, so a fault elsewhere can set this code.
  • A failed actuator can default to a fixed cam position that feels normal at high speed but causes poor idle and low-end torque.
  • Do not overlook the ground circuit; a corroded ground strap can mimic an open control wire and fool a parts-swapping diagnosis.

Can I keep driving with P001A?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration and towing because the engine may lack power and run inefficiently. If the engine enters limp mode or runs very poorly, stop driving and have it towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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