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Engine-Codes – GMC – P1374 GMC

P1374 GMC Code - 3X Reference Circuit

Quick Answer

The P1374 GMC code refers to a 3X reference circuit issue in the vehicle. Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Wiring harness issues. 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
P1374 GMC indicates 3X Reference Circuit.
Common causes
Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Wiring harness issues.
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 08, 2024
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Code P1374 GMC Description

The P1374 GMC code refers to a 3X reference circuit issue in the vehicle. This code indicates that there is a problem with the circuit responsible for providing a reference signal to the Engine Control Module (ECM). The 3X reference circuit plays a crucial role in the engine's operation by providing timing information to the ECM, which is essential for fuel injection and ignition timing.

OBDII Code P1374 GMC - 3X Reference Circuit
P1374 GMC Code - 3X Reference Circuit

Common Causes of P1374 GMC

  1. Faulty crankshaft position sensor
  2. Faulty camshaft position sensor
  3. Wiring harness issues
  4. Malfunctioning ECM
  5. Poor electrical connection

Symptoms of P1374 GMC

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Engine hesitation
  5. Illuminated check engine light

How to Fix P1374 GMC

  1. Begin by using a diagnostic scanner to retrieve the trouble code and identify the specific cause of the issue.
  2. Inspect the crankshaft and camshaft position sensors for any signs of damage or wear. Replace any faulty sensors.
  3. Check the wiring harness connected to the 3X reference circuit for any breaks, shorts, or corrosion. Repair or replace as needed.
  4. Test the ECM to ensure it is functioning correctly. If necessary, reprogram or replace the ECM.
  5. Clear the trouble code from the ECM's memory and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P1374 GMC

The cost of repairing a P1374 GMC code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the repair for this code can range from $200 to $500, including parts and labor. It is important to note that diagnostic time and labor rates can vary, so it is advisable to check with local repair shops for a more accurate estimate. Keep in mind that rates may be higher in metropolitan areas or at dealerships, while independent shops may offer more affordable pricing.

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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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