Faulty or seized secondary air pump (motor worn, water ingress or blocked); Blocked, cracked, leaking or disconnected air hoses or pipes between the pump, valve and exhaust; Stuck or failed secondary air check valve or diverter valve, including carbon build-up or exhaust moisture damage; Wiring, connector or relay fault, or blown fuse, affecting the pump or air valve solenoid; Blocked air injection ports in the exhaust manifold or cylinder head; Faulty oxygen sensor giving a misleading response during the test; Fault in the powertrain control module or its driver circuit.

P1476

Too Little Secondary Air.

Dodge
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
76: FaultThe specific fault in that area

What it means

On a Dodge, P1476 means the powertrain control module has judged that too little secondary air is reaching the exhaust. The secondary air injection system is meant to pump fresh air into the exhaust (or catalyst) for a short time after a cold start to help cut emissions. The module runs a test, normally by checking oxygen sensor response while the air pump is active, and sets the code when the expected change in readings does not appear.

Symptoms

Check engine light on
Air pump not heard running briefly after a cold start, or running louder than normal
Slightly rough or high idle on a cold start
Failed or at risk of failing an emissions test
Fault may only appear on cold starts and clear itself later

Possible causes

Faulty or seized secondary air pump (motor worn, water ingress or blocked)likely
Blocked, cracked, leaking or disconnected air hoses or pipes between the pump, valve and exhaustlikely
Stuck or failed secondary air check valve or diverter valve, including carbon build-up or exhaust moisture damagelikely
Wiring, connector or relay fault, or blown fuse, affecting the pump or air valve solenoidpossible
Blocked air injection ports in the exhaust manifold or cylinder headpossible
Faulty oxygen sensor giving a misleading response during the testrare
Fault in the powertrain control module or its driver circuitrare

How to diagnose

Read all stored codes and freeze frame data, noting engine temperature at the time, and check for other air system or oxygen sensor codes
Do a cold start and listen for the air pump running briefly; note whether it runs, is noisy or stays silent
Visually inspect the pump, hoses, pipes and valves for cracks, loose connections, damage, and water or rust inside
Check the relevant fuse and relay, then test for power, ground and control signal at the pump and valve connectors
Use a scan tool with bi-directional controls, if the model supports it, to command the pump and valve on and confirm they operate
Check that air flows from the pump through the hoses and valve, and that the check valve passes air one way only; the exact method depends on model and engine
Inspect the injection ports for blockage if airflow is good up to the exhaust
Check oxygen sensor response during the test only after the air system has been confirmed to work

How to fix

Replace the secondary air pump if it is seized, noisy or fails to move air
Repair or replace damaged, blocked or leaking hoses and pipes
Replace the faulty check valve or diverter valve
Repair wiring or connectors, or replace the failed relay or fuse once the cause of the failure is found
Clean or clear blocked air injection ports, following the manufacturer's procedure for the model
Replace a confirmed faulty oxygen sensor

Can I keep driving?

Low severity

The car is usually fine to drive in the short term, as this fault mostly affects emissions rather than engine safety. Book it in soon, because it can fail an emissions test and a failed pump or blocked system can get worse.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.