What Does P2053 Mean?
The PCM has detected an open circuit or complete lack of continuity in the reductant (DEF/urea) injection valve circuit for Bank 1, Unit 2. This indicates the control circuit is broken, disconnected, or the injector has failed internally.
Common Causes
35%
Faulty reductant injection valve with internal open circuit
30%
Damaged, corroded, or disconnected wiring harness to the injection valve
20%
Corroded or loose electrical connector at injection valve
10%
Failed DEF system control module or driver circuit
5%
Blown fuse or open circuit in power supply to injection system
Diagnostic Steps
1
Step 1: Visually inspect the reductant injection valve connector for damage, corrosion, or loose pins
2
Step 2: Check continuity of wiring from PCM/DEF module to injection valve using wiring diagram
3
Step 3: Measure resistance of injection valve solenoid (typically 2-10 ohms); compare to specification
4
Step 4: Check for power and ground at injection valve connector with key on
5
Step 5: If all circuits test good, replace injection valve and retest system
Estimated Repair Cost
$300 - $1,200
Parts + labor, varies by vehicle and location
The PCM has detected an open circuit or complete lack of continuity in the reductant (DEF/urea) injection valve circuit for Bank 1, Unit 2. This indicates the control circuit is broken, disconnected, or the injector has failed internally.
The most common cause of P2053 (Reductant Injection Valve Circuit/Open Bank 1 Unit 2) is: Faulty reductant injection valve with internal open circuit
Typical repair costs for P2053 range from $300 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not immediately dangerous to drive, but will cause emissions compliance failure and may trigger vehicle speed/power derate if not repaired. Extended operation may damage SCR catalyst.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2053 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System (SCR/DEF)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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