P200B

Code

Generic P — Powertrain

Intake Manifold Runner Performance Bank 2

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 56 RU: 27

AI status

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Page language: EN

Causes

Stuck or seized intake runner flap/valve (carbon or debris buildup)
Faulty intake runner actuator (electric motor, stepper, or vacuum solenoid)
Damaged or disconnected vacuum line (if vacuum‑operated)
Wiring harness damage or poor connector connection to actuator/position sensor
Faulty intake runner position sensor or feedback circuit
Intake manifold air leaks or internal damage

Symptoms

Check Engine Light (MIL) illuminated; P200B stored
Reduced low‑end torque or sluggish acceleration
Hesitation or stumble on acceleration
Unstable or rough idle (occasionally)
Degraded fuel economy and elevated emissions
Intermittent limp‑in mode on some vehicles

What to check

Read and record all stored/related codes and freeze frame data for Bank 2
Verify whether the code is active or pending; clear codes and attempt to reproduce
Use a scan tool to monitor intake runner position/feedback while commanding the IMRC
Visually inspect actuator, vacuum lines, connectors and wiring for damage or corrosion
Manually operate the actuator (or apply vacuum/power where safe) to confirm movement
Inspect intake manifold and runner passages for carbon buildup or mechanical obstruction

Signal parameters

Actuator command: PWM duty cycle or switched supply (0–100% duty or 0–12 V depending on design)
Position/feedback sensor: analog voltage typically in a 0.5–4.5 V range (varies by vehicle) corresponding to open/closed positions
Resistance/continuity: actuator coil or motor should show continuity within factory specification (no open circuit)
Response behavior: commanded change should produce measurable change in feedback voltage/position within a few seconds
Related sensor signals: MAP/Mass Air Flow and throttle position should change consistently with runner position commands

Diagnostic algorithm

Verify code presence and capture freeze frame. Check for other related codes (e.g., bank 2 intake runner/sensor codes).
With a capable scan tool, command the intake runner actuator while monitoring the runner position feedback and observe actual movement. Note any lag, no movement, or incorrect feedback.
Visually inspect the actuator/solenoid, harness, and connector at Bank 2 for damage, corrosion, or disconnection. Wiggle test while monitoring for intermittent faults.
If vacuum‑operated, check vacuum supply and hoses for leaks or restrictions. Apply hand vacuum to actuator (where safe) to confirm mechanical movement.
Measure voltage and ground at the actuator connector during commanded movement. Verify feedback sensor voltage changes correspond to movement. Compare to manufacturer ranges.
If no electrical faults, remove or access the intake manifold runner mechanism and inspect for carbon buildup, broken linkage, seized flaps or foreign objects preventing travel. Clean or repair as required.
If actuator/position sensor is out of spec, replace the faulty component(s). If contamination caused failure, clean runners and related passages, and replace actuator if damaged.
After repair, clear codes, perform an ignition cycles/drive cycle to verify the IMRC performs correctly and that P200B does not return.
If intermittent or unresolved, inspect ECM grounds and consider ECU reflash or replacement only after excluding mechanical and wiring causes.

Likely causes

Carbon/deposits causing runner to stick
Failed actuator or vacuum solenoid preventing movement
Open/short in wiring or corroded connector to actuator/position sensor
Vacuum supply leak or blocked vacuum passage (on vacuum systems)
Faulty position sensor reporting incorrect position

Fault status

⚠️ Status

MIL illuminated. Code P200B stored for Intake Manifold Runner Performance Bank 2. Freeze frame and live data may show runner position not matching commanded position or slow/no response on Bank 2.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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