P2605

Code

Generic P — Powertrain

Intake Air Heater B Circuit/Open

Brand: Generic

Type: P — Powertrain

Views: UK: 27 EN: 49 RU: 27

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Scan for P2605 and any related codes; read freeze frame and readiness status
Visual inspection of harness, connectors, and connector pins at the intake air heater bank B and PCM
Check fuse(s) and relay(s) for the intake air heater circuit
Backprobe the heater connector while commanding heater ON to verify voltage and ground
Measure resistance of the intake air heater element (bank B) with ignition OFF
Check continuity from heater connector to PCM and to ground

Supply side: battery voltage present at fuse/relay side (~12 V with ignition ON/battery)
Control side: PCM typically provides a ground (or switched supply) to energize the heater—verify change when heater is commanded ON
Heater element resistance: low ohms (typical range: single-digit ohms) — consult vehicle-specific specification
Current draw when energized: several amps (varies by vehicle); significant current indicates heater is drawing load
Expected response: when PCM commands ON, voltage/current should appear at heater and resistance should be continuous to ground

Confirm code and check freeze frame data and any additional related DTCs.
Perform a visual inspection of wiring, connectors, and grounds for bank B; repair obvious damage.
Verify fuses and relay(s) for the intake air heater circuit; replace if blown or faulty.
With ignition OFF, disconnect the heater connector and measure heater element resistance; compare to service spec. If open/infinite, replace heater element.
With ignition ON and heater commanded ON (use a scanner to command or follow service procedure), backprobe the power and control pins at the heater connector to confirm battery voltage on the supply side and PCM ground (or switched supply) on the control side.
If supply voltage is present but no ground/control signal, trace and test continuity from PCM to connector and inspect for shorts/opens; repair wiring as needed.
If no supply voltage at heater connector, trace supply feed (fuse, relay, ignition source) back to battery and repair/replace faulty components.
If wiring and supply are good but heater does not draw current or has high resistance, replace the intake air heater element for bank B.
If heater and wiring test good but PCM does not command the circuit, test PCM output driver per manufacturer procedure and consider PCM replacement only after eliminating wiring and component faults.
Clear codes and verify repair by performing a cold-start functional test and rescanning for codes.