P2051: Reductant Injection Valve Circuit Low Bank 2 Unit 1
What to do
Inducement deadline applies. Worth repairing promptly, since a non-dosing injector is also an uncooled one.
What this code means
The bank 2 unit 1 injector circuit reads below its valid range, normally a short to ground, and the module shuts that output driver down. The cooling consequence described under P2048 applies — an injector that has stopped dosing has also stopped cooling itself.
Likely causes
Start here
- Wiring shorted to ground · moderate
- Faulty reductant injector · specialist
- Road damage to underfloor wiring · moderate
Less common
- Corroded or loose connector · easy
Symptoms
Components involved
Information, not instruction
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Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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