Reductant Injector Circuit Open (Bank 2 Unit 2)
The P2059 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit Open (Bank 2 Unit 2). 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 indicator
- No DEF injection from Bank 2 Unit 2
- Elevated tailpipe NOx emissions
- Speed limiter may be activated
Probable Causes (Ranked by Likelihood)
- Open circuit in Bank 2 Unit 2 DEF injector wiring Very High
- Failed Bank 2 Unit 2 DEF injector High
- Disconnected or damaged connector Moderate
- Blown fuse or relay Moderate
- PCM output driver failure Low
Step-by-Step Diagnostic Procedure
-
Read freeze frame data and confirm P2059
-
Check fuse and relay for Bank 2 DEF injector Unit 2
-
Inspect wiring and connector to Unit 2 injector for open circuits
-
Measure injector coil resistance and compare to OEM specification
Frequently Asked Questions
What does P2059 mean?
P2059 indicates an open circuit in the Bank 2 Unit 2 DEF injector, preventing diesel exhaust fluid from being injected at that location for NOx reduction.
Can I drive with a P2059 code?
Drive only short distances. Without proper DEF injection, NOx emissions are uncontrolled and driving restrictions may apply.
How much does it cost to fix P2059?
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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