What does P0371 mean?

Timing Reference High Resolution Signal A Too Many Pulses Illuminated check engine light, potential rough idle, hesitation, or reduced engine performance

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Overview

P0371 is an OBD‑II generic powertrain code indicating the engine control module (PCM/ECM) detected an excessive number of pulses from the high‑resolution timing reference signal 'A', typically from the crankshaft or camshaft position sensor circuit

Common Symptoms

Check engine light illuminated
Rough idle or engine hesitation
Hard starting or extended cranking
Reduced engine performance or power

Most Common Causes

Faulty crankshaft or camshaft position sensor high

The high‑resolution timing reference sensor often generates the signal; failure can cause excessive pulses

Damaged or corroded wiring/connectors in the timing reference signal circuit high

Poor electrical connections can create spurious pulses

Misaligned or damaged reluctor wheel (tone ring) medium

Irregular teeth or misalignment can generate extra pulses

ECM/PCM signal processing fault low

Rare but possible internal controller malfunction or calibration issue

Diagnostic Steps

Verify the code and check for related codes with an OBD‑II scanner

Expected: P0371 present, note any crankshaft/camshaft related codes

Interpretation: Confirms code and identifies additional issues
Visually inspect the timing reference sensor wiring and connectors for damage or corrosion

Expected: No broken wires, no corrosion, secure connectors

Interpretation: If damaged, wiring repair may fix excessive pulses
Test the high‑resolution sensor output with a multimeter or oscilloscope while cranking

Expected: Stable signal with expected pulse pattern

Interpretation: Irregular or extra pulses indicate sensor or reluctor wheel issues
Inspect the reluctor wheel (tone ring) for missing/damaged teeth or misalignment

Expected: Intact teeth and correct positioning

Interpretation: Damage can cause erroneous pulse counts
Test ECM reference voltage and ground for the sensor circuit

Expected: Reference voltage at sensor meets specification

Interpretation: Lack of proper reference suggests control module or supply circuit issue

Repair Solutions

Replace crankshaft or camshaft position sensor medium

Estimated Cost: $150 - $400

Typical repair when sensor output is erroneous

Repair or replace damaged wiring/connectors medium

Estimated Cost: $100 - $300

Effective if signal circuit faults are present

Inspect and realign or replace reluctor wheel (tone ring) hard

Estimated Cost: $200 - $600

Required if physical damage to the trigger wheel exists

ECM reprogram or replacement hard

Estimated Cost: $600 - $1200

Rare; only if confirmed faulty control module

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Assuming a bad sensor without checking wiring and reluctor wheel first

Frequently Asked Questions

Technical definition of P0371 OBD-II Code

Technically, the P0371 code represents Timing Reference High Resolution Signal A Too Many Pulses. It usually points to a fault within the Ignition.

Is it safe to drive with a P0371 code?

You should treat P0371 as a medium issue. Illuminated check engine light, potential rough idle, hesitation, or reduced engine performance

Common signs of the P0371 error code

You may experience the following: Check engine light illuminated, Rough idle or engine hesitation, Hard starting or extended cranking.

Why is my car throwing a P0371 code?

Potential culprits include: Faulty crankshaft or camshaft position sensor, Damaged or corroded wiring/connectors in the timing reference signal circuit, Misaligned or damaged reluctor wheel (tone ring). A proper diagnosis is recommended.

What is the price difference for fixing P0371?

The cost varies significantly based on the root cause. For example, replacing a Repair or replace damaged wiring/connectors typically costs between $100 and $300, while fixing a ECM reprogram or replacement can range from $600 to $1200.

Is P0371 a generic or manufacturer-specific code?

Yes, P0371 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

P0371: Timing Reference High Resolution Signal A Too Many Pulses