Engine-Codes - Generic - P1821

P1821 Code - Shift Fork Position Sensor 1 System Voltage High Range Out

- Code Popularity: 12,596 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
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What are the Possible Causes of the DTC P1821?

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 Shift Fork Position Sensor 1
  • Shift Fork Position Sensor 1 harness is open or shorted
  • Shift Fork Position Sensor 1 circuit poor electrical connection
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How to Fix the DTC P1821?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1821 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P1821 Code Mean?

The Transmission Control Module (TCM) monitors the Shift Fork Position Sensor 1. The TCM sets the OBDII code when the Shift Fork Position Sensor 1 is not to factory specifications.

P1821 Code - Shift Fork Position Sensor 1 System Voltage High Range Out

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Code P1821 Information for Specific Makes

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