Timing Reference High Resolution Signal A Too Many Pulses

What does P0371 mean?

P0371 stands for Timing Reference High Resolution Signal A Too Many Pulses. The engine computer has detected an ignition problem or a misfire, meaning one or more cylinders are not burning fuel properly.

Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.

Common causes

• Worn spark plugs
• Faulty ignition coil or plug wires
• Clogged fuel injector
• Vacuum leak
• Low compression

What to do

1. Read all stored and pending codes with a scanner. Several codes together often point to one cause.
2. Note the freeze frame data (speed, temperature, load) recorded when the code was set.
3. Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
4. Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.

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Frequently asked questions

What does P0371 mean?

P0371 means “Timing Reference High Resolution Signal A Too Many Pulses”. It belongs to the ignition system or misfire group: The engine computer has detected an ignition problem or a misfire, meaning one or more cylinders are not burning fuel properly.

Is it safe to drive with P0371?

Avoid driving long distances. This kind of fault can cause damage or affect safety, so get it checked as soon as possible.

How do I clear P0371?

Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.

Related codes

• P0367Camshaft Position Sensor B Circuit Low (Bank 1)
• P0368Camshaft Position Sensor B Circuit High (Bank 1)
• P0369Camshaft Position Sensor B Circuit Intermittent (Bank 1)
• P0370Timing Reference High Resolution Signal A Malfunction
• P0372Timing Reference High Resolution Signal A Too Few Pulses
• P0373Timing Reference High Resolution Signal A Intermittent/Erratic Pulses
• P0374Timing Reference High Resolution Signal A No Pulses
• P0375Timing Reference High Resolution Signal B Malfunction

Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.