P2C82: AIR System Pump Supply Voltage Circuit Bank 1

What it means

The AIR pump supply voltage circuit on bank 1 reports a fault. Pump may not start when commanded.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The secondary air injection pump needs a powered supply to send fresh air into the exhaust during cold starts. P2C82 indicates a fault in the bank 1 pump supply-voltage circuit, so the pump may not start when the control module commands it.

Common causes

Most likely first.

1. Supply fuse blown
2. Wiring or connector fault

Symptoms

• Check-engine light
• Failed emissions test
• Rougher cold start or increased exhaust emissions

How to diagnose it

1. Check freeze-frame data and command the bank 1 AIR pump with a scan tool, noting whether the module reports a supply-voltage fault or a failed start.
2. Inspect the pump supply fuse and its terminals for an open fuse, corrosion, overheating, or a loose fit.
3. Follow the bank 1 pump supply and ground wiring to check for chafing, broken conductors, water intrusion, or loose connector pins.
4. Measure voltage at the bank 1 pump connector during a commanded run and compare it with the manufacturer's specification.
5. If power and ground reach the pump correctly, test the pump itself and the circuit's relay or control components using the service information.

Common fixes

• Replace the blown bank 1 AIR pump fuse after checking for a short or overloaded pump.
• Clean or repair corroded, loose, or damaged pump connector terminals.
• Repair an open, shorted, or high-resistance section of the bank 1 pump supply or ground wiring.
• Replace a faulty pump relay or AIR pump if circuit tests identify it as the cause.

Can I keep driving?

You can usually drive the vehicle, but the AIR system may not reduce cold-start emissions and the vehicle may fail an emissions test. Have the supply fault checked soon, especially if a replacement fuse blows again.