AutoCodes – Generic – P1351

P1351 Code - Ignition Control Module Circuit High Voltage

Quick Answer

The Ignition Control Module (ICM) has independent power and ground circuits. 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: P1351 indicates Ignition Control Module Circuit High Voltage.
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 44,467

How popular is this code, among other codes? Medium

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 17, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1351 Description

The Ignition Control Module (ICM) has independent power and ground circuits. The circuits between the ICM and the Powertrain Control Module (PCM) consists of the following circuits:
-The ignition control (IC) timing signal
-The IC timing control
-The low resolution engine speed signal
-The medium resolution engine signal
-The camshaft position signal
-The low reference
The ICM sends 3X signals to the PCM, and controls the timing advance during engine cranking. The timing advance changes to PCM control after the following actions occur:
The PCM receives the second 3X signal
The PCM applies 5 volts to the ignition control (IC) timing signal circuit.
The ICM monitors the CKP sync signal when the engine is cranking. The CKP sync signal is passed from the CKP sensor to the ICM on the CKP sensor 2 signal circuit. The CKP sync signal is used to determine the correct cylinder pair and initiate the ignition coil firing sequence. The 18X reference pulses are passed from the CKP sensor to the ICM on the CKP sensor 1 circuit. The 18X reference pulses are used for fuel injection and ignition control. After the ICM receives both signals, the ICM passes the 18X and 3X reference signals to the PCM. The CMP and the CKP sensors share a 12 volt reference and low reference circuit. The CKP sensor consists of the following circuits:
-A 12 volt reference
-A low reference
-A CKP sensor 1 signal
-A CKP sensor 2 signal

OBDII Code P1351 - Ignition Control Module Circuit High Voltage - AutoCodes.com — P1351 Code - Ignition Control Module Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1351?

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

How to Fix the DTC P1351?

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 P1351 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.

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Information for Specific Makes

P1351 Audi — Camshaft Position Sensor, Bank 1 Range/Performance Problem
P1351 BMW — Misfire Cylinder 5 With Fuel Cut-Off
P1351 Buick — Ignition Control Module Circuit High Voltage
P1351 Cadillac — Ignition Control Module Circuit High Voltage
P1351 Chevrolet — Ignition Control Module Circuit High Voltage
P1351 Dodge — No Change in MAP From Start To Run
P1351 Ford — Ignition Diagnostic Monitor Circuit Input Fault
P1351 GMC — Ignition Control Module Circuit High Voltage
P1351 Hyundai — #1 MF Signal Line Open
P1351 Isuzu — Ignition Control Module Circuit High Voltage
P1351 Lexus — Variable Valve Timing Sensor Range/Performance Problem Bank 2
P1351 MINI — Misfire Cylinder 5 With Fuel Cut-Off
P1351 Toyota — Variable Valve Timing Sensor Range/Performance Problem Bank 2
P1351 Volkswagen — Camshaft Position Sensor, Bank 1 Range/Performance Problem

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.