Reductant Injector Circuit Low (Bank 1 Unit 2)
The P2052 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit Low (Bank 1 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 illuminated
- DEF system fault light
- SCR system performance reduced
- Engine power limitation possible
- Speed restriction warning
Probable Causes (Ranked by Likelihood)
- Short to ground in Unit 2 DEF injector circuit Very High
- Failed DEF injector coil High
- Water or DEF crystallization in connector Moderate
- Chafed wiring contacting ground Moderate
- PCM output driver fault Low
Step-by-Step Diagnostic Procedure
-
Confirm P2052 with freeze frame data
-
Inspect Unit 2 DEF injector connector for crystallization or moisture
-
Check injector wiring for shorts to ground
-
Test injector coil resistance and insulation
Frequently Asked Questions
What does P2052 mean?
P2052 means the Bank 1 Unit 2 DEF injector circuit has low voltage, typically from a short to ground in the wiring or a failed injector coil.
Can I drive with a P2052 code?
Short-distance driving only. The SCR system is compromised, and driving restrictions may be imposed.
How much does it cost to fix P2052?
Expect $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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