Secondary Air Injection System Pump Malfunction Circuit Low
The P2435 code means the vehicle's onboard diagnostic system has detected: Secondary Air Injection System Pump Malfunction Circuit Low. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $700 (parts and labor)
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What Are the Symptoms of P2435?
- Check Engine Light on
- Failed emissions test
- No air pump noise on cold start
- Slightly rough cold start idle
- Sulfur smell on cold start
What Causes P2435? (Most Likely First)
- Short to ground in air pump circuit Very High
- Corroded air pump relay or connector High
- Damaged wiring to air pump motor Moderate
- ECM air pump driver circuit fault Low
Can I Still Drive with P2435?
Short distances only. P2435 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What does P2435 mean?
P2435 indicates: Secondary Air Injection System Pump Malfunction Circuit Low. The ECM detected an issue that needs diagnosis and repair.
Is P2435 urgent?
This code should be addressed soon to maintain proper engine operation.
What should I check first?
Start with a visual inspection of the sensor wiring and connector. Use a scan tool to read live data. For DPF codes, check soot loading level. For EVAP codes, check the gas cap first.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2435?
-
Test secondary air pump by applying direct power
-
Check air pump relay operation
-
Inspect wiring to air pump for damage
-
Verify ECM command to air pump relay with scan tool
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2435?
- 2008-2018 Toyota Tundra 5.7L
- 2010-2018 Subaru Outback 2.5L
- 2009-2017 Volkswagen Tiguan 2.0T
- 2008-2016 Toyota Sequoia 5.7L
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