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P1AC6 Cadillac 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 Cadillac 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 917

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

What does this mean?

What are the Possible Causes of the DTC P1AC6 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code P1AC6 mean on a Cadillac?

P1AC6 indicates an issue with the Drive Motor 1 Control Module's Crankshaft Position Sensor Circuit, which monitors the crankshaft's position in hybrid or electric vehicles.

2. What are the common symptoms of code P1AC6 in a Cadillac?

Symptoms may include reduced engine performance, failure to start, illuminated Check Engine Light, and warning messages related to the hybrid or electric drive system.

3. What causes the P1AC6 code to appear?

This code can be triggered by a faulty crankshaft position sensor, damaged wiring or connectors, a malfunctioning Drive Motor 1 Control Module, or software-related issues.

4. Can I drive my Cadillac with the P1AC6 code active?

Itâ€™s not recommended to drive the vehicle, as this issue could lead to further damage or complete loss of propulsion, especially in hybrid or electric models.

5. How is the P1AC6 code diagnosed?

A mechanic will use a diagnostic scanner to confirm the code, inspect the crankshaft position sensor, test the circuit for continuity, and check for damaged wiring or connectors.

6. How do I fix the P1AC6 code on my Cadillac?

Repairs may involve replacing the crankshaft position sensor, repairing or replacing damaged wiring, or addressing issues with the Drive Motor 1 Control Module.

7. How much does it cost to repair a P1AC6 code on a Cadillac?

The cost varies depending on the exact issue. Replacing a crankshaft position sensor typically costs $150-$300, while control module repairs or replacements may be more expensive.

8. Can a software update fix the P1AC6 code?

In some cases, a software update for the Drive Motor 1 Control Module may resolve the issue if it is related to programming errors.

9. What tools are needed to diagnose the P1AC6 code?

A professional-grade OBDII scanner, multimeter, and possibly an oscilloscope are required to diagnose this code accurately.

10. Can a failing battery cause the P1AC6 code on a Cadillac?

Yes, a failing high-voltage battery or low voltage from the 12V system could potentially cause this code by disrupting the sensor's operation or module communication.