Reductant Injector Circuit Open (Bank 2 Unit 1)
The P2055 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit Open (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 fault warning
- No DEF injection on Bank 2
- Increased NOx emissions
- Speed limiter may engage
Probable Causes (Ranked by Likelihood)
- Open circuit in Bank 2 Unit 1 DEF injector wiring Very High
- Failed Bank 2 DEF injector High
- Corroded injector connector Moderate
- Blown fuse for Bank 2 injector circuit Moderate
- PCM output driver failure Low
Step-by-Step Diagnostic Procedure
-
Confirm P2055 with freeze frame data
-
Check fuse and relay for Bank 2 DEF injector
-
Inspect injector connector and wiring for open circuits
-
Measure injector coil resistance and compare to specification
Frequently Asked Questions
What does P2055 mean?
P2055 indicates an open circuit in the Bank 2 Unit 1 DEF injector, meaning no diesel exhaust fluid is being injected on that bank for NOx reduction.
Can I drive with a P2055 code?
Drive only short distances. Bank 2 NOx reduction is not functioning, and a speed limiter may be imposed.
How much does it cost to fix P2055?
Repairs typically cost $300 to $900 for DEF injector replacement or wiring repair.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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