AutoCodes – Chevrolet – P1AC7 Chevrolet

P1AC7 Chevrolet Code - Drive Motor 1 Control Module Crankshaft Position Sensor Performance

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: P1AC7 Chevrolet indicates Drive Motor 1 Control Module Crankshaft Position Sensor Performance.
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 1,326

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 P1AC7 Chevrolet 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 P1AC7 Chevrolet - Drive Motor 1 Control Module Crankshaft Position Sensor Performance - AutoCodes.com — P1AC7 Chevrolet Code - Drive Motor 1 Control Module Crankshaft Position Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1AC7 Chevrolet?

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 P1AC7 Chevrolet?

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 P1AC7 Chevrolet 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 P1AC7 Chevrolet Code

1. What are common symptoms of OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- Common symptoms include engine stalling, rough idling, poor acceleration, and potential issues with starting the vehicle.

2. What can cause the OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- Potential causes can include a faulty crankshaft position sensor, wiring issues, problems with the drive motor control module, or software malfunctions.

3. How can I diagnose the OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- Diagnosis typically involves using a scan tool to retrieve the fault code, checking the wiring and connections of the crankshaft position sensor, and testing the drive motor control module.

4. Can a DIY enthusiast repair the OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, diagnosing and repairing complex issues with the drive motor control module may require professional expertise.

5. What are some repair tips for fixing the OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- Repair tips may include checking and cleaning the crankshaft position sensor, ensuring proper wiring connections, updating the control module software, and seeking assistance from a qualified mechanic if needed.

6. Is it safe to continue driving with the OBDII code P1AC7 related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance in a Chevrolet?

- It is not recommended to continue driving the vehicle with this code present, as it can lead to further engine performance issues and potential safety risks.

7. How much does it typically cost to repair the OBDII code P1AC7 related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance in a Chevrolet?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a relatively inexpensive sensor replacement to a more costly control module repair or replacement.

8. Can a bad battery or alternator cause the OBDII code P1AC7 in a Chevrolet related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance?

- While a weak battery or failing alternator can sometimes cause electrical issues, they are less likely to directly trigger this specific code related to the drive motor control module and crankshaft position sensor.

9. Will resetting the OBDII code P1AC7 related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance in a Chevrolet make it go away permanently?

- Simply resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again during vehicle operation.

10. How can I prevent the OBDII code P1AC7 related to the Drive Motor 1 Control Module Crankshaft Position Sensor Performance from occurring in my Chevrolet in the future?

- Regular maintenance, such as checking and replacing sensors as needed, ensuring proper electrical connections, and promptly addressing any engine performance issues, can help prevent this code from recurring.