Code
P0415
Generic
P — Powertrain
AIR System Switching Valve B Circuit
Views:
UK: 19
EN: 19
RU: 11
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the AIR switching valve B
- Corroded/damaged connector or pin(s) at the valve or harness
- Faulty AIR switching valve (solenoid) B
- Blown fuse or failed relay supplying the AIR valve circuit
- Poor ground connection or high resistance in ground path
- PCM/ECM driver fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced or disabled secondary air injection (possible failed emissions test)
- Possible trouble codes related to AIR system or emissions control
- Usually no noticeable loss of driveability, though rare cases may cause rough idle
- Vehicle may fail emissions readiness monitors
What to check
- Pull freeze frame / mode $ data with a scan tool and confirm P0415 is current and not historical
- Visual inspection of AIR switching valve B connector and wiring for corrosion, damage, pin push‑out, or water intrusion
- Check relevant fuses and AIR system relays
- Wiggle test wiring harness under the hood while monitoring live data for changes
- Backprobe valve connector and monitor voltage and ground while commanding the valve ON/OFF with a scan tool
- Measure coil resistance of the valve with multimeter (unplugged)
Signal parameters
- Valve coil resistance (typical): approx. 10–50 ohms (vehicle dependent) — measure and compare to spec
- Command voltage when valve commanded ON: near battery voltage (~11–14 V) at the supply pin
- Command signal type: switched battery or PCM‑grounded circuit; some systems use PWM duty control when active
- When commanded OFF: near 0 V at supply or valve control pin (depending on circuit topology)
- PCM output current: depends on circuit but should be within spec; unusually high or low current indicates short/open
Diagnostic algorithm
- Read and record freeze frame, pending codes, and any related AIR codes. Verify P0415 is active.
- Perform a thorough visual inspection of valve B, connector, and wiring (look for corrosion, heat damage, rodent chew, pin damage). Repair obvious issues.
- Check fuses and relays for the AIR system; replace if blown or faulty.
- With harness unplugged, measure valve coil resistance at the valve terminals. Compare to the expected range from vehicle documentation. If open or out of range, replace the valve.
- Reconnect and backprobe the valve connector. Command the switching valve ON with a scan tool and observe voltage at the supply and control pins. Confirm proper supply voltage and that PCM provides the expected ground or control signal.
- If no command voltage or control signal is present, trace wiring back toward the relay/PCM. Check continuity to fuse/relay and to PCM connector pins. Repair short/open as found.
- If correct voltages are present but valve does not actuate, apply battery voltage directly to valve (bench or with jumper) to verify mechanical operation. Replace valve if it does not function.
- If wiring and valve test good but circuit still faults, suspect PCM driver fault. Confirm with manufacturer procedures before replacing PCM.
- After repairs, clear codes, perform functional tests with the scan tool, and complete a drive cycle to verify the code does not return and monitors set to ready.
Likely causes
- Broken/frayed wire in harness to valve B
- Corroded connector terminals at valve B
- Valve coil internal failure (open or shorted winding)
- Blown fuse or stuck relay for AIR system circuit
- Poor engine/chassis ground near valve or harness
- Intermittent short when harness moves (chafe/wear)
Fault status
Status
PCM detected an electrical fault in the Secondary Air Injection switching valve B circuit (open/short/erratic). MIL set; AIR B control disabled until circuit is repaired.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
P0415
GWM
P — Powertrain
- Malfunction in the intake manifold valve circuit B
Views:
UK: 0
EN: 4
RU: 0
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the AIR switching valve B
- Corroded/damaged connector or pin(s) at the valve or harness
- Faulty AIR switching valve (solenoid) B
- Blown fuse or failed relay supplying the AIR valve circuit
- Poor ground connection or high resistance in ground path
- PCM/ECM driver fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced or disabled secondary air injection (possible failed emissions test)
- Possible trouble codes related to AIR system or emissions control
- Usually no noticeable loss of driveability, though rare cases may cause rough idle
- Vehicle may fail emissions readiness monitors
What to check
- Pull freeze frame / mode $ data with a scan tool and confirm P0415 is current and not historical
- Visual inspection of AIR switching valve B connector and wiring for corrosion, damage, pin push‑out, or water intrusion
- Check relevant fuses and AIR system relays
- Wiggle test wiring harness under the hood while monitoring live data for changes
- Backprobe valve connector and monitor voltage and ground while commanding the valve ON/OFF with a scan tool
- Measure coil resistance of the valve with multimeter (unplugged)
Signal parameters
- Valve coil resistance (typical): approx. 10–50 ohms (vehicle dependent) — measure and compare to spec
- Command voltage when valve commanded ON: near battery voltage (~11–14 V) at the supply pin
- Command signal type: switched battery or PCM‑grounded circuit; some systems use PWM duty control when active
- When commanded OFF: near 0 V at supply or valve control pin (depending on circuit topology)
- PCM output current: depends on circuit but should be within spec; unusually high or low current indicates short/open
Diagnostic algorithm
- Read and record freeze frame, pending codes, and any related AIR codes. Verify P0415 is active.
- Perform a thorough visual inspection of valve B, connector, and wiring (look for corrosion, heat damage, rodent chew, pin damage). Repair obvious issues.
- Check fuses and relays for the AIR system; replace if blown or faulty.
- With harness unplugged, measure valve coil resistance at the valve terminals. Compare to the expected range from vehicle documentation. If open or out of range, replace the valve.
- Reconnect and backprobe the valve connector. Command the switching valve ON with a scan tool and observe voltage at the supply and control pins. Confirm proper supply voltage and that PCM provides the expected ground or control signal.
- If no command voltage or control signal is present, trace wiring back toward the relay/PCM. Check continuity to fuse/relay and to PCM connector pins. Repair short/open as found.
- If correct voltages are present but valve does not actuate, apply battery voltage directly to valve (bench or with jumper) to verify mechanical operation. Replace valve if it does not function.
- If wiring and valve test good but circuit still faults, suspect PCM driver fault. Confirm with manufacturer procedures before replacing PCM.
- After repairs, clear codes, perform functional tests with the scan tool, and complete a drive cycle to verify the code does not return and monitors set to ready.
Likely causes
- Broken/frayed wire in harness to valve B
- Corroded connector terminals at valve B
- Valve coil internal failure (open or shorted winding)
- Blown fuse or stuck relay for AIR system circuit
- Poor engine/chassis ground near valve or harness
- Intermittent short when harness moves (chafe/wear)
Fault status
Status
PCM detected an electrical fault in the Secondary Air Injection switching valve B circuit (open/short/erratic). MIL set; AIR B control disabled until circuit is repaired.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
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Code
P0415
HUMMER
P — Powertrain
Secondary Air Injection System Switching Valve B Circuit Malfunction
Views:
UK: 7
EN: 10
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring to the AIR switching valve B
- Corroded/damaged connector or pin(s) at the valve or harness
- Faulty AIR switching valve (solenoid) B
- Blown fuse or failed relay supplying the AIR valve circuit
- Poor ground connection or high resistance in ground path
- PCM/ECM driver fault (less common)
Symptoms
- Malfunction Indicator Lamp (MIL) / Check Engine Light illuminated
- Reduced or disabled secondary air injection (possible failed emissions test)
- Possible trouble codes related to AIR system or emissions control
- Usually no noticeable loss of driveability, though rare cases may cause rough idle
- Vehicle may fail emissions readiness monitors
What to check
- Pull freeze frame / mode $ data with a scan tool and confirm P0415 is current and not historical
- Visual inspection of AIR switching valve B connector and wiring for corrosion, damage, pin push‑out, or water intrusion
- Check relevant fuses and AIR system relays
- Wiggle test wiring harness under the hood while monitoring live data for changes
- Backprobe valve connector and monitor voltage and ground while commanding the valve ON/OFF with a scan tool
- Measure coil resistance of the valve with multimeter (unplugged)
Signal parameters
- Valve coil resistance (typical): approx. 10–50 ohms (vehicle dependent) — measure and compare to spec
- Command voltage when valve commanded ON: near battery voltage (~11–14 V) at the supply pin
- Command signal type: switched battery or PCM‑grounded circuit; some systems use PWM duty control when active
- When commanded OFF: near 0 V at supply or valve control pin (depending on circuit topology)
- PCM output current: depends on circuit but should be within spec; unusually high or low current indicates short/open
Diagnostic algorithm
- Read and record freeze frame, pending codes, and any related AIR codes. Verify P0415 is active.
- Perform a thorough visual inspection of valve B, connector, and wiring (look for corrosion, heat damage, rodent chew, pin damage). Repair obvious issues.
- Check fuses and relays for the AIR system; replace if blown or faulty.
- With harness unplugged, measure valve coil resistance at the valve terminals. Compare to the expected range from vehicle documentation. If open or out of range, replace the valve.
- Reconnect and backprobe the valve connector. Command the switching valve ON with a scan tool and observe voltage at the supply and control pins. Confirm proper supply voltage and that PCM provides the expected ground or control signal.
- If no command voltage or control signal is present, trace wiring back toward the relay/PCM. Check continuity to fuse/relay and to PCM connector pins. Repair short/open as found.
- If correct voltages are present but valve does not actuate, apply battery voltage directly to valve (bench or with jumper) to verify mechanical operation. Replace valve if it does not function.
- If wiring and valve test good but circuit still faults, suspect PCM driver fault. Confirm with manufacturer procedures before replacing PCM.
- After repairs, clear codes, perform functional tests with the scan tool, and complete a drive cycle to verify the code does not return and monitors set to ready.
Likely causes
- Broken/frayed wire in harness to valve B
- Corroded connector terminals at valve B
- Valve coil internal failure (open or shorted winding)
- Blown fuse or stuck relay for AIR system circuit
- Poor engine/chassis ground near valve or harness
- Intermittent short when harness moves (chafe/wear)
Fault status
Status
PCM detected an electrical fault in the Secondary Air Injection switching valve B circuit (open/short/erratic). MIL set; AIR B control disabled until circuit is repaired.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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👍 Like
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0
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