P035C medium Severity

P035C: Ignition Coil C Primary/Secondary Circuit Malfunction

May cause misfire, rough idle, reduced power and increased emissions

Overview

P035C is an OBD-II powertrain trouble code indicating the engine control module detected a malfunction in the ignition coil 'C' primary/secondary circuit, often due to wiring, connector, or coil failure.

Common Symptoms

  • Check Engine Light illuminated
  • Engine misfire or rough idle
  • Reduced engine performance and power
  • Decreased fuel economy

Most Common Causes

Faulty ignition coil C high

Ignition coil failure is a frequent root cause for this circuit fault.

Damaged or corroded wiring/connectors to coil C medium

Wiring harness faults often lead to improper signal or voltage.

Poor connection at coil C connector medium

Loose or corroded connectors can interrupt the primary/secondary circuit.

Faulty PCM/ECM coil driver circuit low

ECM internal driver faults are less common but possible after wiring/coils are ruled out.

Diagnostic Steps

  1. Connect an OBD-II scanner and retrieve freeze frame data for P035C and related codes.
    Expected: Confirm the code and note concurrent misfire or ignition-related codes.
    Interpretation: Establish baseline for further localized ignition circuit diagnosis.
  2. Visually inspect ignition coil C and its connector for corrosion, damage, or loose pins.
    Expected: No visible damage or corrosion.
    Interpretation: Good connections reduce likelihood of simple connector fault; otherwise repair.
  3. Measure resistance of primary and secondary windings of coil C with a multimeter.
    Expected: Resistance within manufacturer specification.
    Interpretation: Out-of-spec indicates coil failure.
  4. Check continuity and voltage on wiring from PCM to coil C connector.
    Expected: Continuity present and correct control voltage.
    Interpretation: Breaks or shorts indicate wiring fault.

Repair Solutions

Replace faulty ignition coil C medium
Estimated Cost: $100 - $400

Typical replacement cost for coil; varies by vehicle model.

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $200

Cost varies with extent of harness damage.

PCM/ECM coil driver repair or replacement hard
Estimated Cost: $300 - $1200

Consider only after wiring and coil faults eliminated.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing spark plugs or unrelated components without verifying ignition coil circuit
  • Assuming fuel delivery problem when symptoms are ignition related

Frequently Asked Questions

Can you explain the meaning of P035C?

The P035C code stands for Ignition Coil C Primary/Secondary Circuit Malfunction. This generally indicates an issue with the Ignition system.

Reflecting on severity: How bad is P035C?

This is a medium priority issue. May cause misfire, rough idle, reduced power and increased emissions

Symptoms associated with DTC P035C

Common symptoms include: Check Engine Light illuminated, Engine misfire or rough idle, Reduced engine performance and power. You might also notice the Check Engine Light is on.

What causes the P035C code?

Potential culprits include: Faulty ignition coil C, Damaged or corroded wiring/connectors to coil C, Poor connection at coil C connector. A proper diagnosis is recommended.

How much does it cost to fix P035C?

The cost varies significantly based on the root cause. For example, replacing a Repair or replace damaged wiring/connectors typically costs between $50 and $200, while fixing a PCM/ECM coil driver repair or replacement can range from $300 to $1200.

Does code P035C apply to Mercedes vehicles?

This is a universal code. You might see P035C on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

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