Error Code P0374: What It Means & What To Do?

<<See All OBD Codes

P0374 is a diagnostic trouble code (DTC) for "Timing Reference High Resolution Signal A No Pulses". This is a generic powertrain code, which means it applies to OBD-II equipped vehicles which have an engine position sensor. This code is detected when there are no high-resolution pulses from the optical sensor to the PCM and the “A” pertains more to an area of the system circuitry than to a particular component.

OBD-II Code P0374 is defined as a Timing Reference High Resolution Signal "A" no Pulses. Diagnostic trouble code P0374 is set when the PCM detects the engine position sensor "A" signal has no pulses. It indicates that the PCM has detected an abnormality in the high-resolution timing reference signal. The powertrain control module (PCM) requires a timing reference signal to determine engine speed and position. This is accomplished by means of an engine position sensor, such as a crankshaft, camshaft or fuel pump position sensor. The PCM uses this information to determine one or more of the following: fuel injector control, ignition timing and misfire diagnostics. There are two types of engine positions sensors: Hall-Effect and permanent magnet. Both are triggered by a wheel mounted close to the sensor. When triggered, the sensor produces a return signal which is sent back to the PCM. The PCM sends a duplicate signal of the crankshaft position sensor to the Fuel Injection Control Module (FICM). If the signal to the FICM becomes corrupt, the PCM will set code P0374.

What causes this problem with the Timing Reference High Resolution Signal A No Pulses?

• Faulty Crankshaft Position Sensor
• Faulty Fuel injection control module
• Failed Powertrain Control Module
• Wiring problem
• Damaged reluctor wheel
• Adulterated oil

1. Powertrain Control Module - PCM is essentially your vehicle’s brain and it is responsible for the health running of your vehicle’s engine. If the PCM is not functioning correctly, the engine and many other functions that are controlled by the PCM will not function correctly either.
2. Camshaft Sensor - The Camshaft sensor determines which cylinder is firing to establish injector synchronization and coil firing sequence in DIS systems. Crankshaft sensors set ignition timing, supply the RPM signal, and determine engine speed. However, a frayed camshaft sensor will always create problems, so replace them immediately.
3. Crankshaft Sensor - A crank sensor is an electronic device used in an internal combustion engine, both petrol and diesel, to monitor the position or rotational speed of the crankshaft. Make sure it should work properly else replace it to avoid associated trouble codes.
4. Distributor Position Sensor - Malfunctioned sensors are one of the common causes for this OBD code and the related ones. Make sure your always replace them if discover faulty.

For error code P0374 some symptoms are detectable while others are not. Some common symptoms of a P0374 engine code may include:

• Misfiring engine
• Spark knocking on acceleration
• Poor fuel mileage
• Engine may not start
• Diminished engine performance

Repair of this issue is not as difficult as some others. However, this issue is also serious and need to be fixed as soon as possible. Repairs and replacements to fix this code may include:

• Repair damaged optical sensor circuit.
• Replace the faulty sensors.
• Repair or replace the damaged wiring and loose connections.
• Replace the faulty PCM which is very rare.

Each and every product you require to fix this code is just a click away on our web. Don’t hesitate to explore our web for all the available options.

Diagnostic trouble code P0374 is not difficult to diagnose and repair, although specific repair steps may be different depending on your car model. Thus, it always pays to have a qualified technician to look after your vehicle when this error code arises.

• Verify your crankshaft position sensor to check for an engine RPM signal when the engine is cranked or running by using scanner or a tachometer.
• If in case you do not detect an RPM signal, then visually inspect the crankshaft position sensor, crankshaft gear, and sensor connector for damage and signs of repair.
• Test the CPS system for a reference voltage signal (typically five-volts).
• Test the resistance of the CPS sensor and compare those values with the manufacturer’s specifications.
• Test the system circuitry for the proper resistance and voltage.
• Repair open or shorted wiring.

Note: There is a test drive recommended after you've completed any repairs to see if the condition is fixed. Before you take a test drive after a repair, always erase the P Code(s) first. This will turn the check engine light off and then you will know if the check engine light returns, you've got further diagnostics to complete.

Common Mistakes When Diagnosing the P0374 Code

• Unnecessary replacement of camshaft, crankshaft, and distributor sensors.
• Crank and cam reluctor rings also need to be checked any time you are replacing sensors.