![]() But, depending on what is causing the engine code, you might have various different performance and engine symptoms. Obviously, the “symptom” of this fault code is a check engine light that is reading P1174: Fuel Trim Cylinder Balance Bank 1. It also tends to be more common with folks who are running exhaust systems and intakes, or K&N drop-in filters. Faulty fuel injectors (either clogged, failed shut or open)įortunately, on Chevy and GMC cars, a faulty O2 sensor tends to be the most common cause.Dirty or faulty MAF (mass air flow sensor).Here are the most common causes on Chevy’s: and continually reappear even once being cleared with a code scanner. On Chevy’s it is common for these codes to appear once a day, once a month, etc. Causes of a P1174 Fault Code – Chevy/GMCĪs mentioned above, P1174 codes can come from sensors, the fueling system, or the intake system. Imbalances can lead to serious engine problems if an engine is run lean or rich for too long. As an example, a rich AFR can occur because you have an intake air leak and aren’t getting enough air, or because your injectors are stuck open and you sending too much fuel.īad AFR ratios can cause a number of performance issues such as rough idling, sluggish or hunting acceleration, misfires, etc. Because an AFR is a ratio, the issue can be caused from both sides of the ratio. Inversely, a rich AFR occurs when you are getting too much fuel compared to the amount of air. Air-to-Fuel RatiosĪ lean air to fuel ratio, or AFR, occurs when your engine is getting too little fuel compared to the amount of air it is getting. These error codes are all too common on Chevy and GMC vehicles and can be caused by a number of different factors relating to both fueling and air. They are differentiated because the two different banks sometimes have different sensors, etc. Ultimately, whether you are getting a bank 1 or bank 2 error code is somewhat irrelevant as the underlying problems do not differ. In traditional V-shaped engines, the 2-4 cylinders (depending on whether it is a V4 or V8, etc.) on the left side are considered “Bank 1” and the cylinder on the left are considered “Bank 2”. But what does that mean and how do you fix it?Ī P1174 & P1175 trouble code means that your air to fuel ratio is either running too lean or too rich.Įngines will have two banks. Additionally, you might see a P1175 code which represents the same problem but is related to Bank 2. The P1174 engine fault code for Chevy and GMC vehicles reads “ Fuel Trim Cylinder Balance Bank 1“. ![]()
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