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P1371 GMC Code - Missing Low Resolution Signal

Quick Answer

The P1371 GMC code indicates a problem with the low-resolution signal from the distributor in the vehicle's ignition system. Common causes include Faulty distributor, Damaged ignition coil, Wiring issues in the ignition system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1371 GMC indicates Missing Low Resolution Signal.
Common causes
Common causes include Faulty distributor, Damaged ignition coil, Wiring issues in the ignition system.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1371 GMC Description

The P1371 GMC code indicates a problem with the low-resolution signal from the distributor in the vehicle's ignition system. In modern vehicles, the ignition system plays a crucial role in starting the engine and maintaining its optimal performance. The low-resolution signal is used by the Engine Control Module (ECM) to determine the engine's speed and position, which is essential for proper ignition timing and fuel delivery.

OBDII Code P1371 GMC - Missing Low Resolution Signal
P1371 GMC Code - Missing Low Resolution Signal

Common Causes of P1371 GMC

  1. Faulty distributor
  2. Damaged ignition coil
  3. Wiring issues in the ignition system
  4. ECM malfunction
  5. Poor electrical connection

Symptoms of P1371 GMC

  1. Rough idling
  2. Engine misfires
  3. Hesitation during acceleration
  4. Reduced fuel efficiency
  5. Engine stalling

How to Fix P1371 GMC

  1. Begin by visually inspecting the distributor, ignition coil, and wiring for any obvious signs of damage or wear.
  2. Use a multimeter to test the low-resolution signal output from the distributor to the ECM.
  3. Check for any loose or corroded electrical connections in the ignition system.
  4. Replace the distributor, ignition coil, or any damaged wiring as needed.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1371 GMC

The typical repair costs for addressing a P1371 GMC code can vary depending on the specific cause of the issue. On average, the parts for this repair can range from $100 to $500, with labor costs adding an additional $100 to $300. It's important to note that these are rough estimates, and actual costs can vary based on factors such as location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a professional mechanic for a more accurate cost assessment.

When is the Code Detected?

The Powertrain Control Module (PCM) detects a predetermined amount of high resolution pulses before detecting any low resolution pulses.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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