AutoCodes – GMC – P1AC6 GMC

P1AC6 GMC 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 GMC 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 996

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

What does this mean?

What are the Possible Causes of the DTC P1AC6 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code P1AC6 in a GMC vehicle?

- Common symptoms include rough engine idle, engine misfires, decreased fuel efficiency, and potential stalling of the vehicle.

2. What can cause the OBDII code P1AC6 to trigger in a GMC vehicle?

- The code P1AC6 is typically triggered by issues with the drive motor 1 control module crankshaft position sensor circuit, such as a faulty sensor or wiring issues.

3. How can I diagnose the cause of the P1AC6 code in my GMC vehicle?

- Diagnosing the P1AC6 code may require using a scan tool to retrieve more specific diagnostic trouble codes, checking the wiring and connections to the crankshaft position sensor, and testing the sensor itself for proper functionality.

4. Can a DIYer repair the OBDII code P1AC6 in a GMC vehicle?

- While some DIYers may be able to address simple wiring or connection issues related to the P1AC6 code, diagnosing and repairing more complex issues with the drive motor control module may require professional assistance.

5. Are there any tips for repairing the drive motor 1 control module crankshaft position sensor circuit related to the P1AC6 code?

- Make sure to carefully inspect the wiring and connections for any signs of damage or corrosion, and consider replacing the crankshaft position sensor if necessary to resolve the issue.

6. Will driving my GMC vehicle with the P1AC6 code present cause further damage?

- Continuing to drive with the P1AC6 code present may result in poor engine performance and potential stalling, so it is recommended to address the issue promptly to prevent further damage.

7. How much does it typically cost to repair the drive motor 1 control module crankshaft position sensor circuit issue triggering the P1AC6 code?

- The cost of repairing the P1AC6 code can vary depending on the specific cause of the issue, but it may range from a simple sensor replacement to more extensive wiring repairs, potentially costing a few hundred dollars.

8. Can resetting the OBDII code P1AC6 in a GMC vehicle make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue with the drive motor control module or crankshaft position sensor circuit is not addressed, the code is likely to reappear.

9. Is it safe to continue driving my GMC vehicle if the P1AC6 code comes on intermittently?

- It is not recommended to drive the vehicle if the P1AC6 code is intermittently coming on, as it indicates a potential issue with the drive motor control module that could lead to more serious problems if left unaddressed.

10. How long does it typically take to repair the drive motor 1 control module crankshaft position sensor circuit issue related to the P1AC6 code?

- The repair time for the P1AC6 code can vary depending on the complexity of the issue and the availability of parts, but it may take a few hours to a day for a professional technician to diagnose and resolve the problem.