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Engine-Codes – GMC – P0018 GMC

P0018 GMC Code - Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'

Quick Answer

The P0018 GMC code indicates a problem with the correlation between the crankshaft position sensor and the camshaft position sensor in Bank 2 Sensor 'A'. Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Incorrect timing belt/chain alignment. 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
P0018 GMC indicates Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'.
Common causes
Common causes include Faulty crankshaft position sensor, Faulty camshaft position sensor, Incorrect timing belt/chain alignment.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0018 GMC Description

The P0018 GMC code indicates a problem with the correlation between the crankshaft position sensor and the camshaft position sensor in Bank 2 Sensor 'A'. In modern vehicles, these sensors play a crucial role in ensuring proper engine timing and performance. The crankshaft position sensor detects the position of the crankshaft, while the camshaft position sensor monitors the position of the camshaft. The Engine Control Module (ECM) uses data from both sensors to determine the optimal timing for fuel injection and ignition.

OBDII Code P0018 GMC - Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'
P0018 GMC Code - Crankshaft Position - Camshaft Position Correlation Bank 2 Sensor 'A'

Common Causes of P0018 GMC

  1. Faulty crankshaft position sensor
  2. Faulty camshaft position sensor
  3. Incorrect timing belt/chain alignment
  4. Timing chain tensioner issues
  5. Wiring or connector issues in the sensor circuit

Symptoms of P0018 GMC

  1. Rough idling
  2. Poor acceleration
  3. Decreased fuel efficiency
  4. Engine misfires
  5. Illumination of the Check Engine Light

How to Fix P0018 GMC

  1. Begin by diagnosing the specific cause of the code using a scan tool to pinpoint the issue.
  2. Inspect the crankshaft position sensor and camshaft position sensor for any signs of damage or wear.
  3. Check the timing belt/chain alignment and adjust if necessary.
  4. Replace any faulty sensors or components causing the correlation issue.
  5. Clear the code from the ECM and test drive the vehicle to ensure the problem has been resolved.

Cost to Fix P0018 GMC

The typical repair costs for addressing the P0018 GMC code can vary depending on the specific cause of the issue and the labor rates in your area. Generally, replacing a faulty sensor or adjusting the timing belt/chain alignment can cost between $200 and $500. However, if more extensive repairs are needed, such as replacing the timing chain tensioner, the cost could range from $500 to $1000 or more. It's recommended to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to shop around for the best price.

What does this mean?

Tech Notes for P0018 GMC

2017-2020 GMC Acadia

2017-2020 GMC Canyon

Technical Article: Diagnosing DTCs P0016 and P0018



If this Diagnostic Trouble Code (DTC) started after recent internal engine repairs, inspect for proper engine mechanical timing. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets.



There is a factory service bulletin for the following GMC models:

2007-2012 GMC Acadia

2010-2012 GMC Terrain

GMC Factory Service Bulletin OBDII Code P0018

When is the Code Detected?

The Powertrain Control Module (PCM) has detected the actual Camshaft Position (CMP) Sensor angle of one camshaft is greater or less than the commanded state.

Need more information about the P0018 GMC code?

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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.

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