Reductant Injector Circuit High (Bank 2 Unit 1)
The P2057 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit High (Bank 2 Unit 1). This is a serious severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $900 (parts and labor)
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Common Symptoms
- Check Engine Light on
- DEF system malfunction warning
- Incorrect DEF injection on Bank 2
- Engine power limitation
- Speed limiter countdown possible
Probable Causes (Ranked by Likelihood)
- Short to voltage in Bank 2 DEF injector circuit Very High
- Defective Bank 2 DEF injector High
- Open ground wire Moderate
- Heat-damaged wiring Moderate
- PCM output driver issue Low
Step-by-Step Diagnostic Procedure
-
Confirm P2057 with freeze frame data
-
Inspect Bank 2 DEF injector wiring for shorts to voltage
-
Verify ground circuit integrity at injector connector
-
Test injector coil resistance against OEM specifications
Frequently Asked Questions
What does P2057 mean?
P2057 means the Bank 2 Unit 1 DEF injector circuit is reading above the expected voltage range, typically from a wiring short to voltage or failed injector.
Can I drive with a P2057 code?
Drive only short distances. DEF injection on Bank 2 is compromised, leading to elevated NOx emissions.
How much does it cost to fix P2057?
Repair costs are typically $300 to $900 for injector or wiring repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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