P002A

B Camshaft Profile Control Circuit/Open Bank 1

P002A is a generic OBD-II powertrain diagnostic trouble code: B Camshaft Profile Control Circuit/Open Bank 1. It is logged by the engine control unit when the ckp/cmp monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P002A
Group
Powertrain
System
CKP/CMP
Severity
Warning (MIL on)
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What P002A means

P002A is a generic OBD-II powertrain code defined as "B Camshaft Profile Control Circuit/Open — Bank 1." The "B" designation refers to the exhaust camshaft on most engine configurations ("A" denotes intake). Bank 1 is the engine bank that contains cylinder #1. The code signals an open-circuit electrical fault detected by the ECM/PCM in the control circuit that activates the camshaft profile switching actuator for the exhaust cam on Bank 1.

Engines that set this code use a two-stage or multi-stage Variable Valve Lift (VVL) or camshaft profile switching mechanism — distinct from simple VVT camshaft phasing. When commanded to switch profiles, the ECM sends a voltage signal to the profile control actuator; P002A sets when the ECM detects no current return from that circuit, indicating an open condition (broken wire, blown fuse, or open-coil actuator). With the profile control stuck, the engine operates on only one cam lobe profile across all RPM ranges, resulting in reduced high-RPM power, compromised low-RPM torque, or both depending on which profile is selected by default. The fault affects brands including Audi, Chevrolet, Ford, and Hyundai that deploy cam-lobe switching systems.

Common causes

Most-frequently reported root causes when P002A is logged.

  • 1
    Open circuit in the wiring harness between the ECM and the Bank 1 B (exhaust) camshaft profile control actuator — the most electrically definitive cause for this specific code
  • 2
    Blown fuse or fusible link in the actuator supply circuit
  • 3
    Broken, corroded, or disconnected connector at the camshaft profile actuator or ECM pin
  • 4
    Open coil winding inside the camshaft profile control solenoid/actuator (internal failure)
  • 5
    Faulty camshaft position sensor on Bank 1 providing erroneous feedback that triggers an open-circuit diagnostic
  • 6
    Incorrect, dirty, or low engine oil preventing the hydraulic portion of the profile switch mechanism from engaging
  • 7
    ECM/PCM internal driver failure for the actuator output channel (uncommon)

Symptoms drivers notice

Check engine light (MIL) illuminated
Noticeably reduced engine power, particularly at high RPM where the alternate cam profile is normally engaged
Sluggish or flat throttle response and poor acceleration
Increased fuel consumption as the engine cannot optimise the valve lift strategy
Possible rough idle or unstable low-speed operation if the default locked-out profile is unfavourable at idle
Rarely, a no-start or very hard start condition if the profile solenoid controls a critical valve event

How to diagnose P002A

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve freeze-frame data with a scan tool and confirm P002A is present; check for companion codes (P002B, P0011, P0017) that may indicate related timing or circuit faults
  2. 2
    Inspect the wiring harness from the ECM to the Bank 1 B-cam profile actuator for visible damage, chafing, or disconnection; verify all connector pins are fully seated and free of corrosion
  3. 3
    Check fuses and fusible links in the actuator supply circuit; replace any blown fuse and investigate what caused it to blow before restarting
  4. 4
    Unplug the actuator connector and measure coil resistance with a DVOM — an open reading (infinite/OL) confirms a failed actuator coil or open wiring; a correct resistance reading (compare to OEM spec) points the fault upstream toward wiring or ECM
  5. 5
    Perform a wiggle test on the harness while monitoring resistance to find intermittent open connections
  6. 6
    Check engine oil level and quality; low or degraded oil can prevent the hydraulic pin in the profile mechanism from engaging even if the solenoid energises correctly
  7. 7
    If all electrical and oil checks pass, use a dealer-level scan tool to command the actuator and verify ECM output voltage; a command with no circuit response while resistance is correct indicates PCM driver failure

Related powertrain codes

Frequently asked questions

What is the difference between P002A and P002B?

P002A indicates an open circuit (no current path) in the Bank 1 B-camshaft profile control circuit. P002B indicates a low-voltage or low-current condition in the same circuit — meaning the wire is connected but voltage is below the expected threshold. Open is typically a broken wire or dead actuator; low is more often a poor connection or weak driver signal.

Which vehicles are most likely to set P002A?

Vehicles with cam-lobe switching systems such as Honda/Acura VTEC, GM AFM/DFM, Ford Ti-VCT, Hyundai CVVL, and Audi valve-lift systems. The code label syntax varies by manufacturer but the OBD-II generic code P002A covers all of them.

Can a bad oil change cause P002A?

Using the wrong oil viscosity can impair the hydraulic pin that actuates cam lobe switching, leading to a performance fault. However, P002A specifically flags an electrical open condition, so oil quality alone would more likely trigger a different performance code rather than a strict open-circuit code.

Is P002A safe to ignore short-term?

The vehicle will run with reduced performance, but driving with a stuck cam profile is generally not an emergency. However, if the open circuit is caused by wiring damage near hot or moving components it should be repaired promptly to prevent further harness damage.

Disabling P002A in software

RaceTune can permanently disable P002A — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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