Code
P0415
GWM
P — Powertrain
- Malfunction in the intake manifold valve circuit B
AI status
Completed
Completed
100%
Causes
- Open or short in wiring harness to IMRC actuator (circuit B)
- Poor or corroded connector contact at the actuator
- Failed IMRC actuator/solenoid/position sensor (stuck or electrically bad)
- Blown fuse or faulty relay supplying IMRC circuit
- Faulty PCM/ECM driver circuit
- Mechanical binding of the intake runner butterfly or linkage
Symptoms
- Check Engine MIL illuminated (stored P0415)
- Reduced engine power, hesitation or rough idle
- Poor throttle response or surge
- Failed emissions test or increased exhaust emissions
- Possible limp-home or reduced performance mode on some vehicles
What to check
- Read freeze-frame and live data with a scan tool; check for related codes
- Visually inspect IMRC actuator, harness, and connector for damage or corrosion
- Command IMRC B ON/OFF with scan tool and observe actuator movement
- Backprobe connector to verify supply voltage and ground while commanding
- Measure actuator coil/driver resistance with connector disconnected
- Check fuses/relays related to intake runner control
Signal parameters
- Supply voltage at actuator: ~11–14 V with ignition ON (engine OFF)
- Control signal: 0–12 V or PWM duty cycle (0–100%) depending on actuator
- Typical actuator coil resistance (approximate): 5–50 ohms depending on design (measure to manufacturer spec)
- When commanded, actuator should change position within a few seconds and show corresponding position or current change on scan tool
- No continuity to chassis ground on control signal line (unless designed as return)
Diagnostic algorithm
- Verify code and related DTCs using a capable scan tool; record freeze-frame data.
- Visually inspect harness and connector at the IMRC actuator B and at the PCM for damage, pin push-out, corrosion or water intrusion.
- With ignition ON (engine OFF) backprobe the actuator connector: verify battery supply (constant or switched 12V) and a control signal/ground from the PCM while commanding the actuator ON/OFF from the scan tool.
- Disconnect the actuator and measure coil resistance with an ohmmeter. Compare to service specification (if unavailable, note large difference from the same bank A actuator or open/short).
- Command the IMRC from the scan tool and observe mechanical movement. If no movement but correct control signals present, remove actuator and bench-test/apply 12V briefly (follow safety precautions) to confirm actuator operation.
- If wiring or connectors show intermittent/open/short, perform continuity and wiggle tests from actuator connector to PCM pin; repair or replace wiring as necessary.
- If the actuator is mechanically seized or fails bench test, replace the actuator or repair linkage; clean carbon deposits if they prevent movement.
- If actuator and wiring check good, suspect PCM driver fault; confirm with manufacturer procedures before replacing PCM.
- After repair, clear codes, perform functional test and road test to confirm proper operation and that P0415 does not return.
Likely causes
- Damaged connector or wiring to the IMRC actuator (most common)
- Failed IMRC actuator (electrical motor or solenoid)
- Mechanical seizure or binding of the runner/valve
- PCM output driver fault or intermittent connector at PCM
Fault status
Status
PCM detected an electrical or operational fault in intake manifold runner control circuit B. The actuator/valve did not respond within expected parameters or circuit integrity is compromised; performance and emissions may be affected.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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