Engine-Codes - Generic - P0816

P0816 Code - Downshift Switch Circuit

- Code Popularity: 13,473 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0816?

  • Faulty Transmission Shift Lever
  • Transmission Shift Lever harness is open or shorted
  • Transmission Shift Lever circuit poor electrical connection
  • Faulty Body Control Module (BCM)

|How to Fix the P0816 Code?

Start by checking 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's pins.

|What is the Cost to Diagnose the Code P0816?

Labor: 1.0

The cost to diagnose the P0816 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

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|What are Code P0816 Possible Symptoms?

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

|What Does the P0816 Code Mean?

The Driver Shift Request (DSR) allows the driver to select the desired range of gears for current driving conditions. The DSR shift system is activated when the gear selector is in the manual position. The DSR system is deactivated in all other range positions. Pressing the plus (+) switch once will command the Body Control Module (BCM) to signal the Transmission Control Module (TCM) to upshift to the next high gear. Pressing the minus (−) switch once will command the BCM to signal the TCM to downshift to the next lowest or previous gear. The TCM will not allow a downshift if the transmission is compromised by over-speeding. The automatic transmission manual shift switch is comprised of three different resistor values in series and two switches. The BCM supplies a 12-volt circuit to the automatic transmission manual shift switch. The signal circuit varies the voltage back to the body control module depending on which switch is depressed. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a stuck On Tap Down switch for 1 second in Park or Neutral or the BCM detects a stuck On Tap Down switch for 10 minutes in any forward gear.

P0816 Code - Downshift Switch Circuit

|Need more Information on the P0816 Code?

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|Code P0816 Information for Specific Makes

|Need Help with the P0816 Code?

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