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Home / DTC / P266C — A Rocker Arm Actuator Position Sensor Circuit Low Bank 2

P266C — A Rocker Arm Actuator Position Sensor Circuit Low Bank 2

Detailed page for trouble code P266C.

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Code

P266C

Generic P — Powertrain

A Rocker Arm Actuator Position Sensor Circuit Low Bank 2

Brand: Generic
Type: P — Powertrain
Views: UK: 18 EN: 24 RU: 16
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Page language: EN

Causes

  • Damaged or shorted wiring or harness to the Rocker Arm Actuator Position Sensor (Bank 2)
  • Poor or corroded connector or terminal at the sensor or ECM
  • Failed Rocker Arm Actuator Position Sensor (Bank 2)
  • Short to ground in the signal or reference circuit
  • Faulty rocker arm actuator or mechanical binding preventing normal sensor output
  • Faulty ECM or internal driver fault

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated with P266C stored
  • Reduced engine power, poor throttle response or limp mode depending on strategy
  • Rough idle or intermittent misfires if valve timing is incorrect
  • Poor fuel economy
  • Possible unusual valve/engine noise if actuator mechanical issue present
  • Loss of VVT functionality for Bank 2 (engine may run in fixed timing mode)

What to check

  • Read and record the stored freeze-frame and freeze data with a scan tool
  • Check battery and charging voltage (12–14.5 V) before testing sensors
  • Visually inspect sensor connector, wiring and harness on Bank 2 for damage, chafing, heat damage, corrosion or pin push-out
  • Backprobe sensor connector and check for reference voltage, signal voltage and ground presence with key ON/engine running as specified
  • Wiggle test harness and observe live data or MIL activity
  • Scan-tool: command rocker arm actuator (if supported) and observe response and position feedback

Signal parameters

  • Reference voltage: typically ~5.0 V (verify with vehicle service data)
  • Signal voltage: variable with actuator position — nominally within approx. 0.2–4.8 V depending on position (manufacturer-specific)
  • Ground: continuity to chassis/ECM ground should be
  • Signal behavior: should change smoothly with actuator movement; may be pulsed or variable analog depending on sensor type
  • Compare live waveform with known-good pattern using an oscilloscope when available

Diagnostic algorithm

  1. Confirm P266C is current or historic and capture freeze-frame and live data using a scan tool. Verify battery voltage is within spec. 2) Perform a visual inspection of Bank 2 rocker actuator sensor connector and harness for damage, heat, corrosion or pin issues. Repair obvious damage. 3) With ignition ON (engine off) backprobe connector: check for reference voltage, ground and static signal. Record values and compare with service data. 4) Start engine or crank while monitoring live data: observe sensor signal while engine turns; check for expected changing voltage/waveform. 5) Perform wiggle test of harness while observing live data or MIL for intermittent faults. 6) Check continuity and resistance of sensor signal and reference wires back to ECM; look for short to ground or to battery voltage. 7) If wiring checks good, command the rocker arm actuator (if supported) and monitor position feedback. If actuator does not respond, test actuator power/ground circuits. 8) If sensor wiring and actuator power are good but signal stays low, replace the Rocker Arm Actuator Position Sensor (Bank 2). 9) If replacement does not clear the issue, perform ECM connector pin checks and consider ECM diagnostic/repair per service procedures. 10) Clear codes and perform a full drive cycle to verify repair. Note: use manufacturer service data for pinouts, voltage specs, and safe disconnection/installation procedures.

Likely causes

  • Wiring short to chassis ground in the sensor signal or reference circuit
  • Corroded/loose connector at the sensor or harness damage near the engine (heat/abrasion)
  • Failed position sensor (common failure)
  • Actuator binding or mechanical failure preventing expected movement (less common)
  • ECM fault (least common)

Fault status

⚠️ Status
Rocker Arm Actuator Position Sensor Circuit Low - Bank 2. Low voltage or short to ground detected on the rocker actuator position sensor circuit for cylinder bank 2; possible wiring, connector, sensor, actuator or ECM issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P266A P266B P266D P0340 P0016 P0026
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