What Does P2037 Mean?
The PCM has detected an electrical fault in the reductant injection air pressure sensor circuit. This sensor monitors the air pressure used to atomize DEF (Diesel Exhaust Fluid) in the SCR (Selective Catalytic Reduction) system.
Common Causes
35%
Damaged or corroded wiring/connectors in the air pressure sensor circuit
30%
Faulty reductant injection air pressure sensor
20%
Poor ground connection or open circuit
15%
PCM internal fault or software issue
Diagnostic Steps
1
Step 1: Visually inspect the air pressure sensor wiring and connectors for damage, corrosion, or loose connections
2
Step 2: Using a multimeter, check voltage and ground supply to the air pressure sensor per manufacturer specifications
3
Step 3: Test sensor signal circuit for opens, shorts to ground, or shorts to power
4
Step 4: If circuits test good, replace the air pressure sensor and retest
5
Step 5: If problem persists, check PCM connector pins and consider PCM replacement
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
The PCM has detected an electrical fault in the reductant injection air pressure sensor circuit. This sensor monitors the air pressure used to atomize DEF (Diesel Exhaust Fluid) in the SCR (Selective Catalytic Reduction) system.
The most common cause of P2037 (Reductant Injection Air Pressure Sensor "A" Circuit) is: Damaged or corroded wiring/connectors in the air pressure sensor circuit
Typical repair costs for P2037 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may enter reduced power mode or limp mode. Continued operation will cause emissions non-compliance and may result in DEF system shutdown after warning period.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2037 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control (SCR System)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
