Reductant Injector Circuit High (Bank 1 Unit 2)
The P2053 code means the vehicle's onboard diagnostic system has detected: Reductant Injector Circuit High (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 on
- DEF system malfunction active
- Incorrect DEF injection rate
- Engine power reduction
- Speed limiter countdown possible
Probable Causes (Ranked by Likelihood)
- Short to voltage in Unit 2 DEF injector wiring Very High
- Defective Unit 2 DEF injector High
- Open ground wire in injector circuit Moderate
- Wiring damage from exhaust heat Moderate
- PCM output driver malfunction Low
Step-by-Step Diagnostic Procedure
-
Read freeze frame data and confirm P2053
-
Inspect wiring to Unit 2 DEF injector for shorts to voltage
-
Verify injector ground circuit continuity
-
Measure injector coil resistance against specifications
Frequently Asked Questions
What does P2053 mean?
P2053 indicates the Bank 1 Unit 2 DEF injector circuit is reading above the expected voltage, usually from a short to voltage or failed injector.
Can I drive with a P2053 code?
Drive only short distances. The DEF system malfunction will lead to elevated emissions and possible driving restrictions.
How much does it cost to fix P2053?
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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