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P1AC6 Buick Code - Drive Motor 1 Control Module Crankshaft Position Sensor Circuit

Quick Answer

The Crankshaft Position (CKP) Sensor circuits consist of an Engine Control Module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. Common causes include Faulty Drive Motor Generator Power Inverter Control Module (PIM), Drive Motor Generator Power Inverter Control Module (PIM) harness is open or shorted, Drive Motor Generator Power Inverter Control Module (PIM) circuit poor electrical connection. 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: P1AC6 Buick indicates Drive Motor 1 Control Module Crankshaft Position Sensor Circuit.
Common causes: Common causes include Faulty Drive Motor Generator Power Inverter Control Module (PIM), Drive Motor Generator Power Inverter Control Module (PIM) harness is open or shorted, Drive Motor Generator Power Inverter Control Module (PIM) circuit poor electrical connection.
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 852

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 01, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1AC6 Buick Description

The Crankshaft Position (CKP) Sensor circuits consist of an Engine Control Module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes of the teeth and slots of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to sequence the ignition timing and fuel injection events for the engine. The ECM also uses CKP sensor output information to determine the crankshaft relative position to the camshaft, to detect cylinder misfire, and to control the CMP actuator if equipped.
Motor Control Module (MCM) 1 is also connected to the CKP sensor signal and low reference circuits. The MCM uses the CKP sensor output information to determine engine crankshaft position to aid in smooth engine Auto-starts.

OBDII Code P1AC6 Buick - Drive Motor 1 Control Module Crankshaft Position Sensor Circuit - AutoCodes.com — P1AC6 Buick Code - Drive Motor 1 Control Module Crankshaft Position Sensor Circuit

What does this mean?

What are the Possible Causes of the DTC P1AC6 Buick?

Faulty Drive Motor Generator Power Inverter Control Module (PIM)
Drive Motor Generator Power Inverter Control Module (PIM) harness is open or shorted
Drive Motor Generator Power Inverter Control Module (PIM) circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1AC6 Buick?

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 codes P0335 or P0336 are set, diagnose them prior to diagnosing this code.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1AC6 Buick 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 P1AC6 Buick Code

1. What are the common symptoms of OBDII code P1AC6 in a Buick related to the Drive Motor 1 Control Module Crankshaft Position Sensor Circuit?

The common symptoms include engine stalling, rough idling, reduced engine performance, and difficulty starting the vehicle.

2. What are the possible causes of OBDII code P1AC6 in a Buick?

Possible causes include a faulty crankshaft position sensor, wiring issues in the circuit, a malfunctioning drive motor control module, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P1AC6 in my Buick?

Diagnosing this code typically involves checking the crankshaft position sensor for proper operation, inspecting the wiring for any damage or loose connections, and testing the drive motor control module and engine control module for faults using a diagnostic scanner.

4. Can I still drive my Buick with OBDII code P1AC6 present?

It is not recommended to drive your Buick with this code present, as it can lead to further engine damage or safety issues. It's best to address the underlying problem as soon as possible.

5. How can I repair OBDII code P1AC6 in my Buick?

Repairing this code may involve replacing the faulty crankshaft position sensor, repairing any damaged wiring in the circuit, or replacing the drive motor control module if necessary. It is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair.

6. Will resetting the OBDII code P1AC6 in my Buick make it go away permanently?

Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It's crucial to diagnose and repair the root cause of the problem to prevent future occurrences.

7. Is it safe to continue driving if the OBDII code P1AC6 in my Buick intermittently comes and goes?

It is not advisable to ignore intermittent occurrences of this code, as they can indicate an underlying issue that needs attention. Continuing to drive the vehicle without addressing the problem may lead to more severe consequences.

8. Can a DIY enthusiast without much experience fix OBDII code P1AC6 in a Buick?

While some simple repairs like checking the wiring connections can be done by a DIY enthusiast, diagnosing and repairing complex issues related to this code may require specialized tools and expertise. It's best to consult a professional mechanic for proper diagnosis and repair.

9. How long does it typically take to repair OBDII code P1AC6 in a Buick?

The repair time can vary depending on the exact cause of the code and the extent of the repairs needed. Simple fixes like replacing a sensor or repairing wiring may take a few hours, while more complex issues could require more time for diagnosis and repair.

10. Will fixing OBDII code P1AC6 improve the overall performance of my Buick?

Yes, addressing this code and resolving the underlying issue can improve the engine performance, fuel efficiency, and overall reliability of your Buick. It's essential to address any warning codes promptly to ensure the vehicle operates optimally.