What is fault code P0170?

The P0170 code means that the powertrain control module is detecting a fuel trim that is outside the range of specification set by the vehicle’s manufacturer. If the signal from the oxygen sensors calls for less fuel, the powertrain control module will act out a negative fuel trim.

What happens when the fuel pump goes out on a Honda Accord?

There are physical signs that you can feel when your Accord’s fuel pump is going out. Before taking anything apart, check to see if your engine’s computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure is too low.

What does p0170 mean on Honda fuel trim bank?

In writing this article I’ve added Mercedes-Benz-specific info since it seems that M-B (and VW) are most prone to having this P0170 Honda surface along with misfire codes or other fuel trim codes. P0170 Honda means there was a malfunction in the computer’s control of the air:fuel ratio.

What does Bank 1 fuel trim malfunction mean?

Error Code P0170: Fuel Trim Malfunction (Bank 1) Error Code P0170 is described as Fuel Trim Malfunction Bank 1. This means the PCM (powertrain control module, also known as ECM or engine control module) has detected a fuel trim outside the specified range set by the vehicle’s manufacturer.

What can cause a fuel trim to malfunction?

Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins. P0170 Tech Notes Dirty air filter, air filter housing or Mass Air Flow (MAF) sensor, or faulty MAF sensor are common causes for the P0170 code.

What does it mean when Honda fuel trim says p0170?

It also indicates that the fuel trims reached their limit of adding fuel while trying to compensate for a actual or perceived rich condition. When the fuel trims reach their rich correction limit, the PCM (Powertrain Control Module) sets a P0170 Honda, indicating a problem or malfunction in the fuel trims.

What is the fault code on a Honda?

It appears to me that the PCM (powertrain control module) logic used by some European car manufacturers to set a P0170 Honda (or P0173 Honda) fault code simply isn’t used by American vehicle manufacturers. It is more common to see P0171 Honda, 0174, 0172, 0175 codes set with regard to fuel trim malfunctions on American cars.