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

- Code Popularity: 7,654 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P1AC7?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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)
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How to Fix the DTC P1AC7?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

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

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1AC7 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

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

Need More Information on the Code?

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Information for Specific Makes

  • P1AC7 Buick Drive Motor 1 Control Module Crankshaft Position Sensor Performance
  • P1AC7 Cadillac Drive Motor 1 Control Module Crankshaft Position Sensor Performance
  • P1AC7 Chevrolet Drive Motor 1 Control Module Crankshaft Position Sensor Performance
  • P1AC7 GMC Drive Motor 1 Control Module Crankshaft Position Sensor Performance
  • P1AC7 Saturn Drive Motor 1 Control Module Crankshaft Position Sensor Performance

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Code P1AC7 comments

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