Description of fault code P0117,
OBD2 Error Codes

P054A Cold start B, camshaft position timing over-extended, bank 1

P054A Cold start B, camshaft position timing over-extended, bank 1

OBD-II DTC Datasheet

Improved Camshaft Position Synchronization at Cold Start B Bank 1

What does this mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. Car brands may include, but are not limited to, VW, Audi, Ford, Nissan, Hyundai, BMW, Mini, Mercedes-Benz, Jeep, etc.

The ECM (Engine Control Module) is an extremely powerful computer that controls and monitors the vehicle's engine ignition system, mechanical positioning of rotating components, fuel injection, exhaust systems, emissions, transmission, and many other systems.

Another system that the ECM must monitor and adjust accordingly is the Variable Valve Timing (VVT) system. Essentially, these systems allow the ECM to control the mechanical timing between the camshaft and the crankshaft. This increases the overall efficiency of the engine. Not to mention the fuel economy benefits. In truth, the ideal timing for your engine should be adjusted based on changing conditions. This is why they developed the VVT ​​system.

P054A (Cold Start Camshaft Position Extended Range 1) is a code that alerts the operator that the ECM is monitoring an "excessive" - ​​advanced VVT position to determine valve timing on Bank 1. Typically due to a cold start. Failure of this VVT self-test occurs due to the valve timing being exceeded beyond its maximum calibration or remaining in the advanced position. Bank 1 is the side of the engine that contains cylinder #1.

Note: The "B" camshaft is the exhaust, right, or left camshaft. Left/Right and Front/Rear are defined as if you were sitting in the driver's seat.

What is the severity of this DTC?

The P054A code is a problem that should be taken to a mechanic immediately because it is a very complex, not to mention serious, problem. This type of problem largely affects the ECM, so a technician should inspect your vehicle if this or related trouble codes appear. Typically, the ECM does not detect the desired response to several electronic commands for the VVT, and the code has been set.

Since the problem is caused by the variable valve timing system, which is a hydraulically controlled system, its functionality will be limited in low throttle conditions, when driving on flat roads, or at cruising speeds. Not to mention the constant switching of the system to fix problems, leads to excessive oil consumption and the appearance of trouble codes when the oil pressure drops, which affects the functionality of the VVT ​​system.

What are some of the symptoms of the code?

Symptoms of the P054A diagnostic code may include:

  • Poor engine performance
  • Reduced fuel economy
  • Possible misfiring at startup
  • Cold start problems

What are some of the common causes for the code?

Causes of this P054A DTC may include:

  • Crankshaft position sensor defective
  • Camshaft position sensor damaged
  • The solenoid valve for controlling the phases of the inlet valves is faulty
  • The inlet interlock control solenoid valve is defective.
  • Debris has accumulated in the camshaft signal receiving area.
  • Timing chain installed incorrectly
  • Foreign matter contaminates the oil groove for controlling the phases of the intake valves.

What are the steps to diagnose and troubleshoot a P054A?

The first step in the process of troubleshooting any problem is to review technical service bulletins (TSBs) for known problems with a particular vehicle.

Advanced diagnostic steps become very vehicle specific and may require appropriate advanced equipment and knowledge to be performed accurately. We outline the basic steps below, but refer to your vehicle / make / model / transmission repair manual for specific steps for your vehicle.

Make sure you check for service bulletins that can provide possible solutions to any problems, as most vehicles have updatable software in their engine control modules. If replacement is required, it is best to use a new factory ECU and program the latest software. This step will require you to travel to an authorized service center for your vehicle brand.

NOTE. Remember that the ECM can be easily replaced if the engine sensor is indeed faulty, which could be the result of a missing part in the initial diagnosis. This is why professional technicians will follow some kind of flow chart when checking the DTC to prevent misdiagnosis. It is always a good idea to consult the service information for your particular model first.

Having said that, it would be a good idea to check for camshaft.cuum leaks immediately, as they can cause more problems in the future if left unattended. Refer to your service manual for specific diagnostic procedures and component locations.

Depending on what type of camshaft position sensor you have (such as Hall effect, variable resistance sensor, etc.), the diagnosis will differ depending on the manufacturer and model. In this case, the sensor must be energized to monitor the position of the shafts. If a defect is found, replace the sensor, reset the codes and test drive the vehicle.

Given the fact that there is "cold start" in the code description, you should probably take a look at your cold start injector. It can also be head-mounted and is available to some extent. Nozzle harnesses are extremely susceptible to drying out and cracking due to conditions that cause intermittent connection. And most likely a cold start problem. Be very careful when disconnecting any injector connector during diagnosis. As mentioned, they are very fragile.

This article is for informational purposes only and technical data and service bulletins for your specific vehicle should always take priority.

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NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.

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