Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
The cost of diagnosing the P2438 Buick code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Secondary air injection pressure sensors, which are integral to the shutoff and check valves, are used to monitor the air flow from the secondary air injection pump. The Engine Control Module (ECM) supplies voltage to the 5 V reference circuits and provides a ground for the low reference circuits. The sensors provide a signal voltage to the ECM relative to the pressure changes within the secondary air injection system.
The Diagnostic Trouble Code (DTC) will set when the ECM detects that the corresponding bank 2 secondary air injection pressure sensor signal is out of specifications.
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