P2444: Secondary air injection pump stuck on (bank 1)
Secondary air injection system pump stuck on, bank 1
Severity: Severity not verified — if the car runs badly, have it inspected
The source read describes the code but does not rate driving risk; it lists stalling at idle or start-up among possible symptoms.
P2444 in short
P2444 means the computer reads the bank 1 secondary air pump control circuit as stuck on, which is a voltage reading rather than a check of airflow. A switching valve, wiring fault, the pump or its sensor can cause it. A wiring short was the fix in one GM bulletin. Severity is not verified.
When the computer turns the secondary air pump relay on, it expects the voltage in the control circuit to fall close to zero. If the reading does not match what it commanded, it stores P2444.
Because it is a circuit check, wiring and the switching valve are as likely as the pump itself. One GM bulletin on the 2008 Cadillac DTS lists P2444 with an engine harness that chafes on a power steering hose bracket.
This code is the pump stuck-on one; the stuck-off code is a different number.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Air switching or vacuum switching valve, or its wiring
Common general cause- Why it ranks here
- PartsAvatar lists the vacuum switching valve, its wiring and the air switching valve first.
- What would change this
- Rises if the valve does not respond to a command or its wiring has an open or short. Falls if the valve and wiring test fine.
Cause 2: Air injection pump, pressure sensor or relay
Common general cause- Why it ranks here
- PartsAvatar lists the pump, the pressure sensor and the control relay among the causes.
- What would change this
- Rises if the pump circuit voltage is wrong when commanded. Falls if the circuit behaves normally.
Cause 3: Engine harness chafing on a bracket (2008 Cadillac DTS)
Possible — needs testing- Why it ranks here
- GM bulletin PIC-4947 says the engine harness may chafe and short on the power steering pressure hose bracket when P2444 is stored on the 2008 DTS. The summary does not say the pump is involved.
- What would change this
- Rises if the harness shows rub marks at the bracket. Falls if the harness is clean or the car is not a DTS.
Cause 4: Engine computer fault
Possible — needs testing- Why it ranks here
- PartsAvatar lists the engine computer last.
- What would change this
- Rises only after wiring, valve and pump pass.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Look over the secondary air pump, valve and their connectors and the nearby harness for rubbing, burns or corrosion.
IfChafed or damaged wiring is found
It meansRepair it and recheck the code.
Points to: Engine harness chafing on a bracket (2008 Cadillac DTS)
IfWiring looks fine
It meansTest the valve and pump circuit.
Step 2: With a bidirectional scan tool, command the secondary air pump and switching valve on and off and watch the pump circuit.
IfThe valve does not respond
It meansTest the switching valve and its wiring.
Points to: Air switching or vacuum switching valve, or its wiring
IfThe pump circuit voltage does not follow the command
It meansTest the pump, relay and pressure sensor.
Symptoms
- Check engine light
- Stalling at idle or start-up on some cars Gets more serious: stop and have it checked.
- Noise from the secondary air system
How to fix
Step 1: With the engine off and cool, look for harness damage near the secondary air pump and valve connectors.
Parts and cost context
- Secondary air pump:Test the valve circuit and wiring before replacing the pump. Labour varies; get a quote.
Labor varies by vehicle and shop; get a quote before you approve a repair.
Compare used part prices on PartPriceGuideOn your vehicle
CadillacYour car
2008 · DTS
Supported by vehicle dataGM PIC-4947 says the engine harness may rub on the power steering hose bracket when P2444 sets. Whether it is still current is not verified.
PIC-4947Status unverified
Check engine light on with P2444
2008dts · issued · NHTSA 10026646
The engine harness may chafe and short on the power steering pressure hose bracket. The summary does not give the repair.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
PIP-4947Status unverified
Check engine light on with P2444 (companion record)
2008dts · issued · NHTSA 10026667
Same harness chafing cause as PIC-4947.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
No curated relationships for P2444 yet.
Sources and review
- P2444 OBD trouble code: secondary air injection system pump stuck on, bank 1
- GM PIC-4947: check engine light on with P2444, harness chafing on power steering hose bracket
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
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