What Does P2437 Mean?
The PCM has detected a voltage signal from the secondary air injection system air flow or pressure sensor on Bank 2 that is below the expected threshold. This indicates either a short to ground, faulty sensor, or wiring issue preventing proper signal transmission.
Common Causes
35%
Failed secondary air pressure/flow sensor on Bank 2
30%
Damaged or shorted wiring/connector to Bank 2 sensor
20%
Short to ground in Bank 2 sensor circuit
10%
Corroded sensor connector causing signal degradation
5%
Failed PCM (rare)
Diagnostic Steps
1
Step 1: Visually inspect Bank 2 secondary air injection pressure sensor connector and wiring for damage, corrosion, or shorts to ground
2
Step 2: Using a multimeter, check sensor signal voltage at the Bank 2 sensor connector with key on, engine off
3
Step 3: Perform resistance test on sensor signal wire from sensor to PCM, verify no shorts to ground (should be >10k ohms)
4
Step 4: Test sensor power supply (typically 5V reference) and ground circuits for proper operation
5
Step 5: If all circuits test properly, replace Bank 2 secondary air pressure sensor and retest system
Estimated Repair Cost
$150 - $400
Parts + labor, varies by vehicle and location
The PCM has detected a voltage signal from the secondary air injection system air flow or pressure sensor on Bank 2 that is below the expected threshold. This indicates either a short to ground, faulty sensor, or wiring issue preventing proper signal transmission.
The most common cause of P2437 (Secondary Air Injection System Air Flow/Pressure Sensor Circuit Low Bank 2) is: Failed secondary air pressure/flow sensor on Bank 2
Typical repair costs for P2437 range from $150 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is safe to drive. This fault affects emissions compliance and may cause increased cold-start emissions and failure of emissions testing.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2437 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System - Secondary Air Injection
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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