What Does P2057 Mean?
The PCM detects abnormally low voltage or resistance in the reductant injection valve circuit for Bank 2, Unit 2. This suggests a short to ground or internal injector coil short circuit on the second bank.
Common Causes
35%
Short to ground in Bank 2 wiring harness to reductant injection valve
30%
Failed Bank 2 reductant injection valve with internal short
20%
Water intrusion or corrosion in Bank 2 connector causing short
10%
Damaged wiring from exhaust heat or mechanical damage
5%
Failed DEF control module Bank 2 driver circuit
Diagnostic Steps
1
Step 1: Disconnect Bank 2 reductant injection valve and measure coil resistance
2
Step 2: Test for short to ground on control and power wires with valve disconnected
3
Step 3: Inspect wiring routing near exhaust components for heat damage
4
Step 4: Check for moisture or contamination in connector that could cause short
5
Step 5: Replace injection valve or repair wiring based on test results
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The PCM detects abnormally low voltage or resistance in the reductant injection valve circuit for Bank 2, Unit 2. This suggests a short to ground or internal injector coil short circuit on the second bank.
The most common cause of P2057 (Reductant Injection Valve Circuit Low Bank 2 Unit 2) is: Short to ground in Bank 2 wiring harness to reductant injection valve
Typical repair costs for P2057 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle can be driven but emissions system is compromised. May trigger progressive power reduction strategies and eventually limit vehicle operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2057 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
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