AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0362 is an OBD‑II generic powertrain code indicating a malfunction in the primary or secondary circuit of ignition coil L, often due to wiring faults, bad ignition coil, or PCM driver issues.

Common Symptoms

Check Engine Light illuminated
Engine misfire or rough running
Reduced engine power
Hesitation on acceleration

Most Common Causes

Faulty ignition coil ‘L’ high

Ignition coil failure commonly triggers P0362 when the PCM detects abnormal primary or secondary circuit behavior

Open or short in ignition coil wiring circuit high

Damaged, chafed, or corroded wiring/connectors between PCM and ignition coil

Faulty Powertrain Control Module (PCM) coil driver medium

Rare but possible; PCM may have failed driver transistor or internal damage

Defective spark plug affecting secondary circuit medium

Secondary circuit issues can mimic ignition coil circuit faults

Incorrect generic source listing as camshaft sensor circuit issue low

Some generic DTC lists incorrectly associate P0362 with camshaft position sensor circuits; vehicle‑specific documentation should be checked

Diagnostic Steps

Verify code with OBD‑II scanner and record freeze frame data

Expected: P0362 stored in ECU with any additional codes

Interpretation: Confirms the presence of P0362 and helps identify concurrent issues
Perform visual inspection of ignition coil ‘L’ wiring and connectors

Expected: No broken wires, corrosion, or loose connectors

Interpretation: Damaged wiring/connector issues are common causes
Test ignition coil ‘L’ primary and secondary circuit with multimeter/scope

Expected: Proper voltage and continuity per manufacturer specs

Interpretation: Abnormal readings indicate coil or circuit fault
If wiring and coil test good, check PCM driver output signal

Expected: Correct driver signal waveform or voltage

Interpretation: No signal suggests PCM driver fault
Clear codes and test drive after repairs

Expected: Code does not return

Interpretation: Successful repair confirmed

Repair Solutions

Replace faulty ignition coil ‘L’ medium

Estimated Cost: $80 - $300

Costs vary by vehicle; includes coil part and labor

Repair or replace damaged wiring/connectors medium

Estimated Cost: $50 - $200

Depends on extent of wiring damage

Replace or reprogram PCM if driver circuit failed hard

Estimated Cost: $400 - $1200

High cost and should be last resort after confirming PCM fault

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Misinterpreting code as camshaft position sensor issue without vehicle‑specific confirmation

Frequently Asked Questions

Technical definition of P0362 OBD-II Code

Technically, the P0362 code represents Ignition Coil ‘L’ Primary/Secondary Circuit Malfunction. It usually points to a fault within the Ignition.

How serious is the P0362 code?

You should treat P0362 as a medium issue. May cause misfire, rough idle, loss of power, hesitation, or stalling; can affect driveability but vehicle may still operate in limp mode

What are the symptoms of P0362?

Drivers often report: Check Engine Light illuminated, Engine misfire or rough running, Reduced engine power when this code is present.

Common triggers for the P0362 error

The most common causes are: Faulty ignition coil ‘L’, Open or short in ignition coil wiring circuit, Faulty Powertrain Control Module (PCM) coil driver.

Estimated repair costs for different causes of P0362

Repair costs depend on the specific failure. A simple Repair or replace damaged wiring/connectors replacement is relatively affordable ($50-$200), whereas a Replace or reprogram PCM if driver circuit failed repair is more expensive, potentially reaching $1200.

Does P0362 affect Ford, Toyota, or Honda?

P0362 is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

P0362: Ignition Coil ‘L’ Primary/Secondary Circuit Malfunction