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P1AC7 Cadillac 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 Cadillac 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 953

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 Mar 01, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1AC7 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 P1AC7 Cadillac - Drive Motor 1 Control Module Crankshaft Position Sensor Performance - AutoCodes.com — P1AC7 Cadillac Code - Drive Motor 1 Control Module Crankshaft Position Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P1AC7 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 P1AC7 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 P1AC7 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 P1AC7 Cadillac Code

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

- Common symptoms include rough idle, engine misfires, loss of power, and potential stalling.

2. What are the possible causes of OBDII code P1AC7 on a Cadillac?

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

3. How can I diagnose the cause of OBDII code P1AC7 on my Cadillac?

- Diagnosis typically involves conducting a thorough inspection of the crankshaft position sensor and its wiring, testing the drive motor control module, and checking for any related trouble codes.

4. What are some repair tips for addressing OBDII code P1AC7 on a Cadillac?

- Repair tips may include replacing the crankshaft position sensor, repairing any damaged wiring, reprogramming the drive motor control module, or updating the engine control module software.

5. Can I continue driving my Cadillac with OBDII code P1AC7 present?

- It is generally not recommended to continue driving with this code unresolved, as it can lead to further damage to the engine and potentially unsafe driving conditions.

6. How much does it typically cost to repair OBDII code P1AC7 on a Cadillac?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a few thousand dollars, including parts and labor.

7. Is OBDII code P1AC7 related to emissions compliance in my Cadillac?

- Yes, this code can impact emissions compliance as it affects the performance and control of the drive motor and related systems.

8. Are there any common DIY fixes for OBDII code P1AC7 on a Cadillac?

- While some simple tasks like checking and cleaning connections or replacing the crankshaft position sensor may be DIY-friendly, thorough diagnosis and repair often require professional expertise.

9. How long does it take to repair OBDII code P1AC7 on a Cadillac?

- The repair time can vary based on the specific cause of the code and the complexity of the repair, but it may take anywhere from a few hours to a full day in most cases.

10. Can OBDII code P1AC7 on a Cadillac cause long-term damage if left unresolved?

- Yes, if left unresolved, this code can lead to engine performance issues, increased fuel consumption, and potentially more severe damage to engine components over time.