P219B Error Code: What It Is And How To Fix It

An unexpected Check Engine Light (CEL) or Service Engine Soon (SES) light can ruin your day awfully quickly. Whether it's preventing your vehicle from passing state emissions testing, interrupting your commute to work, or managing to make an appearance as you head out on vacation, the uncertainty of these warning lights can make anyone nervous. The severity of the required repairs can range from cheap fixes all the way to engine overhauls and transmission replacements.

Fortunately, here at CarBuzz, we strive to provide you with the most accurate information when it comes to handling Diagnostic Trouble Codes (DTCs). In this article we are going to cover everything you need to know about the P219B error code, specifically described as a Fuel Trim Cylinder Balance Bank 2 fault code. Let's take a closer look at what the code means, symptoms associated with the code, common causes for the fault, how to fix it, and how much it costs to fix.

P219B Error Code

Code Number

Code Description

Related Codes

P219B

P0174 - System Too Lean (Bank 2)

P0175 - System Too Rich (Bank 2)

P219A - Fuel Trim Cylinder Balance Bank 1

All model-specific information has been sourced from the manufacturer and ALLDATA. Repair/replacement costs are sourced from RepairPal, and credited at the end of the article.

The P219B code is a manufacturer-specific code that is typically used by Chevrolet. The Powertrain Control Module (PCM) uses several sensors to achieve optimal efficiency. However, there are two post-combustion oxygen or air/fuel sensors that are mounted on the exhaust before the catalytic converter of each bank. These sensors monitor the air/fuel ratio and the PCM will make adjustments to the fuel trim based on their reading.

The PCM will constantly alter the injector pulse depending on the signals from the Mass Air Flow sensor (MAF), Throttle Position sensor (TPS), and the readings from the post-combustion oxygen sensors. This code is set by the PCM when the vehicle performs the fuel trim balance diagnostic strategy, and it detects a rich or lean air/fuel ratio imbalance. The P219B code indicates the issue is specific to the 'bank 2' cylinders.

The following are the most commonly reported causes of the P219B error code:

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The following are the most commonly reported symptoms associated with the P219B fault code:

In most cases, you may continue driving with the P219B fault code active. Although some users experience more severe drivability symptoms such as reduced power or hesitation, most people will only note the illuminated check engine light. We recommend closely monitoring your vehicle's symptoms as it's possible for symptoms to worsen over time. If your vehicle develops more severe symptoms, we recommend seeking repairs immediately.

When it comes to repairing the cause of the P219B code, we recommend verifying that the code is listed as an active DTC first. To do this, you'll need your PCM scanned by a scanner. This can be done at emissions testing facilities, local parts stores, repair shops, and even by yourself if you own a scanner. Be sure to note any additional DTCs such as the P0300 code. These additional DTCs will help diagnose the exact cause of the P219B code.

The exact repair your vehicle may need may differ from others as there can be a few causes of the P219B code. We recommend starting with some simple checks first.

Inspecting for vacuum leaks can be done by most people. Simply pop the hood, remove any engine covers, and inspect the air intake from the filter housing to the throttle body. If no split or cracked hoses can be found, run the engine and listen for a hissing sound. It may be necessary to spray starting fluid around the hissing areas. If the RPM or engine sound changes, that is the location of the vacuum leak. If you do not have starting fluid, a propane torch can be used in its place. Open the valve to release the gas. DO NOT ignite the torch. Use the gas as a leak detector. If the RPM or sound changes, the leak has been detected. A common area for vacuum leaks is around the intake manifold.

A leaking exhaust can cause the oxygen sensors to have inaccurate readings. We recommend thoroughly inspecting the exhaust for leaks specifically before or near the sensor. You'll want to follow the manufacturer's testing procedure for the oxygen sensors. A quick way to test an oxygen sensor is to monitor the data using a scan tool. If the data cycles between 0.200mV and 0.800mV, the sensor is reading as it should. You can test this by removing a vacuum line from the engine and checking the response of the sensor. Both a faulty sensor and a leaking exhaust can result in the P219B error code.

If your ignition system is faulty, you'll likely have cylinder misfire codes stored in the PCM. We recommend checking your spark plugs and ignition coils. According to the mileage service interval table, Chevy recommends the spark plugs on the 5.3L V8 engine be replaced at 97,500 to 100,000 miles.

Inspect the fuel pressure with a fuel pressure gauge. Most domestic vehicles will have a fuel pressure test port located directly on the fuel rail. Some vehicles will require the fuel lines to be removed and a gauge "T'd in". If the fuel pressure is below spec, the filter and fuel pump most likely need to be replaced. Additional areas of fuel system faults that can lead to the P219B code are dirty or malfunctioning fuel injectors and/or a faulty fuel injector control module.

If the above actions fail to locate a fault, you'll want to consult a professional repair shop for more advanced computer diagnostics.

Some vehicles that set the P219B code may fall under this Technical Service Bulletin (TSB) from Chevrolet. This bulletin applies to models like the Blazer, Bolt EV, Camaro, and Silverado.

The P219B code can be tricky to repair, especially when no correlating DTCs are set by the PCM. This usually leads to extended diagnostic times, which is why we recommend checking for simple issues like vacuum leaks first. In most cases, a simple vacuum hose repair will cost between $5 and $100 if you manage the repair yourself. More serious leaks, such as a leaking intake manifold gasket, can cost as much as $800, according to RepairPal.

Exhaust gaskets are cheap, only costing between $15 and $30. A replacement pipe can cost around $350 as long as a catalytic converter is not attached. Oxygen sensors for a P219B Chevy code are priced at around $300. Replacing these can be done by most DIYers.

An engine tune-up will likely cost you somewhere near $300, while a faulty ignition coil costs between $50 and $150. A fuel pump replacement can be costly. RepairPal estimates a fuel pump replacement will cost around a staggering $1,800. Injection cleaning services usually cost between $100 and $200, and replacement fuel injectors can cost as much as $1,000. A faulty fuel injector control module can cost as much as $1,600. However, some companies can rebuild a faulty module for around $200.

Replacement Cost Estimates

Component

Cost Estimate

Intake gasket set

$60 - $160

Oxygen sensor

$50 - $420

Spark plug

$6 - $15 (each)

Ignition coil

$30 - $120

Fuel injector

$80 - $200 (each)

Fuel pump

$50 - $500

CarBuzz recommends only accredited professionals and manufacturers as the first choice for repairing any vehicle errors or problems.

Sources: RepairPal, ALLDATA, NHTSA, Tsbsearch

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