What are the common causes of P2606?

An intake air heater B element that draws the wrong current. A marginal intake air heater B relay. Corroded or loose heater B connections. A supply voltage drop on the heater B circuit.

Command intake air heater B on a scan tool. Measure heater B current and resistance. Check the heater B relay and fuse. Inspect the heater B wiring and terminals. Replace intake air heater B if the circuit tests good. Clear the code and retest.

P2606

Intake Air Heater B Circuit Range/Performance

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P2606 means Intake Air Heater B Circuit Range/Performance.

Check these first

An intake air heater B element that draws the wrong current
A marginal intake air heater B relay
Corroded or loose heater B connections
A supply voltage drop on the heater B circuit

What to do next

Command intake air heater B on a scan tool
Measure heater B current and resistance
Check the heater B relay and fuse
Inspect the heater B wiring and terminals
Replace intake air heater B if the circuit tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.