P0018 medium Severity

P0018: Crankshaft Position – Camshaft Position Correlation (Bank 2, Sensor A)

May cause rough idle, loss of power, poor fuel economy, engine hesitation or stalling when the timing correlation deteriorates beyond acceptable limits

Overview

P0018 indicates that the engine control module has detected an out-of-sync relationship between the crankshaft position signal and the Bank 2 camshaft position sensor A signal, often due to timing system, sensor, or VVT issues

Common Symptoms

  • Illuminated check engine light
  • Rough or uneven idle
  • Reduced engine performance
  • Increased fuel consumption
  • Difficulty starting or stalling

Most Common Causes

Stretched or misaligned timing chain/belt high

Wear in timing components can allow the chain/belt to skip teeth, altering cam/crank correlation

Faulty camshaft position sensor (Bank 2) high

CMP sensor failure or poor signal can trigger a correlation fault

Faulty crankshaft position sensor medium

CKP sensor signal errors disrupt timing correlation

Variable valve timing actuator or solenoid malfunction medium

VVT system issues can affect cam timing and trigger the code

Wiring harness or connector damage to position sensors medium

Frayed, broken, or corroded wiring can cause intermittent signals

Tone ring displacement or damage low

Loose, damaged, or sheared key on crank or cam tone rings impacts sensor readings

Diagnostic Steps

  1. Scan for P0018 and any accompanying codes with an OBD-II scanner
    Expected: Retrieves P0018 and possibly other timing/cam/crank related codes
    Interpretation: Presence of multiple timing codes may point toward systemic timing or VVT issues
  2. Visually inspect camshaft and crankshaft position sensors and harnesses
    Expected: No frayed wires, corrosion, or connector faults
    Interpretation: Damaged wiring or connectors likely cause inconsistent signals
  3. Check sensor signal patterns with oscilloscope or multimeter
    Expected: Consistent, proper waveform signals for both cam and crank sensors
    Interpretation: Missing or erratic signal indicates faulty sensor or tone ring issue
  4. Inspect timing chain/belt alignment and condition
    Expected: Proper alignment with no skipped teeth or excessive slack
    Interpretation: Misaligned or worn timing components cause correlation error
  5. Test variable valve timing solenoid/actuator operation
    Expected: Proper function allowing cam phasing in and out
    Interpretation: Stuck/failed VVT components can trigger P0018

Repair Solutions

Replace worn timing chain or belt and tensioner hard
Estimated Cost: $500 - $1500

Labor intensive; recommended when mechanical timing misalignment is confirmed

Replace faulty camshaft or crankshaft position sensor medium
Estimated Cost: $100 - $350

Common if testing shows sensor signal faults

Repair or replace VVT solenoid/actuator medium
Estimated Cost: $200 - $600

Necessary if VVT diagnostics indicate malfunction

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Replacing only the camshaft or crankshaft sensor without verifying timing component alignment or wiring integrity

Frequently Asked Questions

Technical definition of P0018 OBD-II Code

The P0018 code stands for Crankshaft Position – Camshaft Position Correlation (Bank 2, Sensor A). This generally indicates an issue with the Sensors system.

Should I stop driving if I have P0018?

The P0018 code is considered medium severity. May cause rough idle, loss of power, poor fuel economy, engine hesitation or stalling when the timing correlation deteriorates beyond acceptable limits

Symptoms associated with DTC P0018

You may experience the following: Illuminated check engine light, Rough or uneven idle, Reduced engine performance.

What causes the P0018 code?

Potential culprits include: Stretched or misaligned timing chain/belt, Faulty camshaft position sensor (Bank 2), Faulty crankshaft position sensor. A proper diagnosis is recommended.

Repair cost breakdown for P0018

Expect to pay around $350 if the issue is a Replace faulty camshaft or crankshaft position sensor, but up to $1500 if the Replace worn timing chain or belt and tensioner needs replacement.

Does code P0018 apply to Honda vehicles?

Yes, P0018 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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