AutoCodes – Hummer – P0016 Hummer

P0016 Hummer Code - Crankshaft Position-Intake Camshaft Position Correlation Bank 1

Quick Answer

The Crankshaft Position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. Common causes include Mechanical timing fault (stretched timing chain or damage timing chain tensioner), Blocked oil passage, Low oil level. 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: P0016 Hummer indicates Crankshaft Position-Intake Camshaft Position Correlation Bank 1.
Common causes: Common causes include Mechanical timing fault (stretched timing chain or damage timing chain tensioner), Blocked oil passage, Low oil level.
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 4,709

How popular is this code, among other codes? Low

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 Feb 13, 2019

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0016 Hummer Description

The Crankshaft Position (CKP) sensor is a permanent magnet generator, known as a variable reluctance sensor. The magnetic field of the sensor is altered by a crankshaft mounted reluctor wheel that has seven machined slots, 6 of which are equally spaced 60 degrees apart. The seventh slot is spaced 10 degrees after one of the 60 degree slots. The CKP sensor produces seven pulses for each revolution of the crankshaft. The pulse from the 10 degree slot is known as the sync pulse. The sync pulse is used to synchronize the coil firing sequence with the crankshaft position. The CKP sensor is connected to the Powertrain Control Module (PCM) by a signal circuit and a low reference circuit.
The Camshaft Position (CMP) sensor is triggered by a notched reluctor wheel built into the exhaust camshaft sprocket. The CMP sensor provides 6 signal pulses every camshaft revolution. Each notch, or feature of the reluctor wheel is of a different size for individual cylinder identification. This means the CMP and crankshaft position (CKP) signals are pulse width encoded to enable the PCM to constantly monitor their relationship. This relationship is used to determine camshaft actuator position and control its phasing at the correct value. The PCM also uses this signal to identify the compression stroke of each cylinder, and for sequential fuel injection. The CMP sensor is connected to the PCM by a 12-volt, low reference, and signal circuit.

OBDII Code P0016 Hummer - Crankshaft Position-Intake Camshaft Position Correlation Bank 1 - AutoCodes.com — P0016 Hummer Code - Crankshaft Position-Intake Camshaft Position Correlation Bank 1

What does this mean?

What are the Possible Causes of the DTC P0016 Hummer?

Mechanical timing fault (stretched timing chain or damage timing chain tensioner)
Blocked oil passage
Low oil level
Faulty Intake ('A') Camshaft Position (CMP) Sensor
Faulty Crankshaft Position (CKP) Sensor

How to Fix the DTC P0016 Hummer?

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 does this mean?

Code Tech Notes

If this 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.

If a P0016 is resetting without any engine performance concerns but the above information did not isolate a cause for the DTC, replace the Cam Phaser Actuator sprocket.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0016 Hummer 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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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.

Frequently Asked Questions about P0016 Hummer Code

1. What are the common symptoms of OBDII code P0016 in a Hummer?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling.

2. What does the OBDII code P0016 in a Hummer indicate?

- This code indicates a correlation issue between the crankshaft position sensor and the intake camshaft position sensor on Bank 1 of the engine.

3. What are the possible causes of OBDII code P0016 in a Hummer?

- Possible causes include a faulty camshaft position sensor, crankshaft position sensor, timing belt/chain issues, or engine mechanical problems.

4. How can I diagnose the cause of OBDII code P0016 in my Hummer?

- Diagnosing this code may involve checking the sensors' wiring, inspecting the timing components, and performing a thorough visual inspection of the engine components.

5. Is it safe to continue driving my Hummer with OBDII code P0016?

- It is not recommended to drive the vehicle with this code as it can lead to further engine damage or potential safety hazards.

6. Can I reset the OBDII code P0016 in my Hummer using a diagnostic tool?

- While you can reset the code with a diagnostic tool, it is essential to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it typically cost to repair OBDII code P0016 in a Hummer?

- The cost of repair can vary depending on the specific cause of the code, but it may involve sensor replacement, timing component repair, or other related fixes.

8. Are there any DIY tips for fixing OBDII code P0016 in a Hummer?

- DIY tips may include checking and cleaning sensor connections, inspecting the timing belt/chain for wear, and ensuring proper alignment of the components.

9. Can a mechanic easily repair OBDII code P0016 in a Hummer?

- A qualified mechanic should be able to diagnose and repair the issue efficiently, especially if they have experience with similar cases.

10. How can I prevent OBDII code P0016 from occurring in my Hummer in the future?

- Regular maintenance, such as timely sensor replacements, checking the timing components, and addressing any engine performance issues promptly, can help prevent this code from appearing.