P002B

B Camshaft Profile Control Circuit Low Bank 1

P002B is a generic OBD-II powertrain diagnostic trouble code: B Camshaft Profile Control Circuit Low 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
P002B
Group
Powertrain
System
CKP/CMP
Severity
Warning (MIL on)
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What P002B means

P002B is defined as "B Camshaft Profile Control Circuit Low — Bank 1." The "B" camshaft is the exhaust camshaft in most OEM conventions; Bank 1 is the cylinder bank containing cylinder #1. The code is set when the ECM/PCM detects a voltage or current level in the camshaft profile control circuit that is below the minimum expected threshold — a "low" condition as opposed to the "open" condition flagged by P002A.

A low-circuit fault typically means the wire is still connected but an abnormally high resistance in the circuit (corroded pin, partial break, weak solenoid coil) or a short to ground is pulling the signal voltage below the PCM's acceptance window. The ECM interprets this as an inability to properly control the Bank 1 exhaust camshaft's lift profile switching mechanism. Affected engines include those using two-step or continuously variable valve lift systems. When stuck, the engine defaults to one cam lobe profile, losing the ability to optimise valve lift for both low-speed efficiency and high-speed power. The result is reduced performance, possible misfires, rough idle, and increased fuel consumption. This code is frequently found alongside P002A on vehicles that have sustained wiring harness damage or connector corrosion.

Common causes

Most-frequently reported root causes when P002B is logged.

  • 1
    Short to ground in the wiring harness of the Bank 1 B-camshaft profile control circuit — most characteristic of a "low" voltage code
  • 2
    Corroded, damaged, or high-resistance connector at the camshaft profile actuator solenoid pulling signal voltage below threshold
  • 3
    Faulty camshaft profile actuator solenoid with degraded internal coil resistance causing excessive current draw
  • 4
    Faulty camshaft position sensor on Bank 1 reporting low or erratic signals that the PCM misinterprets as a circuit fault
  • 5
    Low or contaminated engine oil preventing hydraulic engagement of the cam profile pin, causing the actuator to draw excessive current
  • 6
    Damaged or corroded wiring between the PCM and solenoid reducing voltage below the minimum command threshold
  • 7
    ECM/PCM internal fault — output driver sinking too low on the signal line (uncommon)

Symptoms drivers notice

Check engine light illuminated
Reduced engine power and poor throttle response, particularly noticeable at high RPM
Rough idle or stalling at low speeds as cam profile switching is disabled
Engine misfires or hesitation during acceleration
Decreased fuel efficiency due to fixed non-optimal valve lift
Loud ticking or knocking from the cam profile actuator area on Bank 1

How to diagnose P002B

A typical diagnostic flow when this code is present.

  1. 1
    Connect a scan tool and confirm P002B; record freeze-frame data and check for companion codes such as P002A, P0011, or P0300 that indicate the scope of the fault
  2. 2
    Inspect the Bank 1 B-camshaft actuator wiring harness and connector thoroughly for corrosion, bent pins, chafed insulation, or signs of rodent damage; a low-voltage code is often resolved by cleaning or re-terminating a corroded connector
  3. 3
    With the connector unplugged, measure circuit resistance from the solenoid pin back to the PCM and check for continuity to ground — resistance to ground lower than expected confirms a short-to-ground condition
  4. 4
    Measure solenoid coil resistance across the actuator terminals; compare to OEM specification (typically 10–20 Ω for profile solenoids) — below-spec resistance indicates a shorted coil requiring solenoid replacement
  5. 5
    Check engine oil level and condition; change oil if it is dark, sludgy, or at an incorrect specification, as contaminated oil can cause the hydraulic profile pin to bind and overload the solenoid circuit
  6. 6
    Use a scan tool to command the actuator on and measure supply voltage at the solenoid connector during activation — voltage below 10V under command suggests wiring voltage drop or PCM driver weakness
  7. 7
    After repairing wiring or replacing components, clear codes, perform a full drive cycle, and confirm no return of P002B before returning the vehicle to service

Related powertrain codes

Frequently asked questions

What is the difference between a circuit "low" code and a circuit "open" code?

An open circuit (P002A) means there is no electrical path — a broken wire or dead coil. A low circuit (P002B) means a path exists but voltage is below the expected minimum, typically from a short to ground, high-resistance connection, or a coil drawing more current than the driver can sustain.

Can dirty or old engine oil really cause P002B?

Indirectly, yes. Sludgy oil can prevent the hydraulic cam-profile locking pin from releasing, forcing the solenoid to remain energised and under load far longer than normal. This prolonged current draw can overheat the coil, reduce its resistance, and pull supply voltage below the low-voltage threshold.

How much does it cost to fix P002B?

If the fix is a connector cleaning or minor wiring repair: $50–$150 in labour. Solenoid replacement typically costs $150–$400 depending on location and vehicle. If the ECM driver is damaged, PCM replacement can run $500–$1,200+ including programming.

Should I replace the camshaft position sensor for P002B?

Only if live data shows erratic or flat-line sensor output. P002B specifically targets the profile control actuator circuit, not the position sensor. Replace the sensor only after electrical testing confirms it is at fault rather than the solenoid or wiring.

Disabling P002B in software

RaceTune can permanently disable P002B — 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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