AutoCodes – Generic – P1376

P1376 Code - Ignition Ground Circuit

Quick Answer

The Powertrain Control Module (PCM) applies 2.5 volts on the Reference Low (Ref Lo) Voltage circuit to the Ignition Control Module. Common causes include Faulty Ignition Control Module, Ignition Control Module harness is open or shorted, Ignition Control Module circuit poor electrical connection. 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: P1376 indicates Ignition Ground Circuit.
Common causes: Common causes include Faulty Ignition Control Module, Ignition Control Module harness is open or shorted, Ignition Control Module circuit poor electrical connection.
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.

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Code Popularity 12,133

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Dec 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1376 Description

The Powertrain Control Module (PCM) applies 2.5 volts on the Reference Low (Ref Lo) Voltage circuit to the Ignition Control Module. Reference Low Voltage to the Powertrain Control Module represents the voltage difference between Reference Low and the Powertrain Control Module power ground. This is needed to ensure that the Powertrain Control Module and Ignition Control (IC) Module signals all have the same ground reference. The Diagnostic Trouble Code (DTC) will be set when the Reference Low Voltage to the Powertrain Control Module is too low.

OBDII Code P1376 - Ignition Ground Circuit - AutoCodes.com — P1376 Code - Ignition Ground Circuit

What does this mean?

What are the Possible Causes of the DTC P1376?

Faulty Ignition Control Module
Ignition Control Module harness is open or shorted
Ignition Control Module circuit poor electrical connection

How to Fix the DTC P1376?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1376 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1376 code?

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Need Help with the Code?

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Information for Specific Makes

P1376 Audi — Cylinder 8 Ignition Circuit Open
P1376 Buick — Ignition Ground Circuit
P1376 Cadillac — Ignition Ground Circuit
P1376 Chevrolet — Ignition Ground Circuit
P1376 GMC — Ignition Ground Circuit
P1376 Jaguar — Ignition Coil Cylinder 6 Early Activation
P1376 Volkswagen — Cylinder 8 Ignition Circuit Open

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.