Reductant Injection Valve Circuit Low Bank 1 Unit 2
The P2054 code means the vehicle's onboard diagnostic system has detected: Reductant Injection Valve Circuit Low Bank 1 Unit 2. This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $100 - $600 (wiring or connector at the low end; actuator/valve replacement at the high end)
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What Are the Symptoms of P2054?
- Check Engine Light on
- Drivability may be normal - many circuit faults show no symptom the driver notices
- The affected system may fall back to a default strategy, costing power or economy
- Related values implausible or frozen on a scan tool
What Causes P2054? (Most Likely First)
- Fault in the Reductant Injection Valve Circuit Low Bank 1 Unit 2 circuit: a fault in this circuit High
- Damaged wiring, a chafed harness, or a corroded connector at the Reductant Injection Valve Circuit Low Bank 1 Unit 2 High
- Failed Reductant Injection Valve Circuit Low Bank 1 Unit 2 Moderate
- Control module input/driver fault (rule this out last - it is the least common) Low
Can I Still Drive with P2054?
Yes, but fix soon. P2054 is rated moderate severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
What does P2054 mean?
P2054 is a generic OBD-II code defined by SAE J2012 as "Reductant Injection Valve Circuit Low Bank 1 Unit 2". It means the control module detected a fault in this circuit
Can I keep driving with P2054?
Yes for normal use, but get it diagnosed - the system is running on a fallback strategy and a small wiring fault left alone tends to become a bigger one.
Does P2054 mean the same thing on every car?
Yes. P2054 is in the generic (SAE J2012) range, so the definition is standardized across manufacturers. The specific component location and repair procedure still vary by vehicle - check your service information.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2054?
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Read the code and freeze-frame data, then watch the Reductant Injection Valve Circuit Low Bank 1 Unit 2 live on a scan tool.
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Inspect the connector and harness at the Reductant Injection Valve Circuit Low Bank 1 Unit 2 before replacing anything - wiring and corrosion cause most of these.
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Back-probe the circuit and compare signal, ground, and reference voltage against the service-manual values.
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Wiggle-test the harness while watching the live value if the fault is intermittent.
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Clear the code and confirm with a road test that covers the conditions in the freeze frame.
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P2054?
- All OBD-II vehicles - this is a generic (SAE J2012) code with the same meaning across makes
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