P0174 on a Chevrolet Silverado 1500
P0174 means system Too Lean (Bank 2). On the Silverado 1500, a few causes come up far more than others.
What P0174 usually means on a Silverado 1500
P0174 is the bank-2 lean code, the companion to P0171. On the Silverado, when both set together the cause is almost always something that affects the whole engine, like a dirty MAF, a PCV leak, or weak fueling, rather than a single cylinder. When P0174 sets alone, look for a leak specific to bank 2, such as an intake gasket on that side. It is a common pairing on aging GM trucks and usually traces to unmetered air.
Most common causes on the Silverado 1500
- Shared MAF or PCV/vacuum issue
Because bank-2 lean usually rides with bank-1 lean, a common MAF or PCV leak is the first thing to check when both codes are present.
- Bank-2 intake or gasket leak
A leak isolated to the bank-2 runner or gasket leans only that side, which is why P0174 can appear without P0171.
- Vacuum leak on the bank-2 side
A cracked hose or fitting on bank 2 admits unmetered air and sets the code on that bank alone.
- Insufficient fuel delivery
A weak pump or clogged injectors can leave both banks lean under load, so a bank-2 code can reflect a whole-engine fuel-supply problem.
What P0174 costs to fix on a Silverado 1500
As with P0171, the common repairs are cheap: a MAF cleaning, a PCV hose, or an intake gasket. A smoke test efficiently confirms a bank-2-specific leak before committing to gasket work. Costs rise only if the intake gasket or fuel-supply components are the root cause.
Fixing it
If both P0171 and P0174 are present, chase a shared cause like the MAF or PCV. If only P0174 is set, smoke-test bank 2's intake and gasket area specifically.
For the full step-by-step diagnosis order (any vehicle), see the main P0174 guide.
Year, engine and mileage change the answer. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Chevrolet Silverado 1500
Related symptoms
Chevrolet Silverado 1500 problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0174 behavior is covered on the main P0174 page. Confirm with a scan tool before buying parts.
P0174 on your Silverado 1500?
Every problem becomes a Case. Tell Redline what your Silverado 1500 is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
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Next: check the slide pins move freely before buying parts.