AutoCodes – Generic – P07B9

P07B9 Code - Transmission Park Position Sensor/Switch 'B' Circuit Low

Quick Answer

The Transmission Control Module (TCM) monitors the Transmission Park Position Sensor/Switch circuit. Common causes include Faulty Transmission Park Position Sensor/Switch, Transmission Park Position Sensor/Switch harness is open or shorted, Transmission Park Position Sensor/Switch 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: P07B9 indicates Transmission Park Position Sensor/Switch 'B' Circuit Low.
Common causes: Common causes include Faulty Transmission Park Position Sensor/Switch, Transmission Park Position Sensor/Switch harness is open or shorted, Transmission Park Position Sensor/Switch 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 3,688

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 May 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P07B9 Description

The Transmission Control Module (TCM) monitors the Transmission Park Position Sensor/Switch circuit. The TCM sets the OBDII code when the Transmission Park Position Sensor/Switch is out of factory specifications.

OBDII Code P07B9 - Transmission Park Position Sensor/Switch 'B' Circuit Low - AutoCodes.com — P07B9 Code - Transmission Park Position Sensor/Switch 'B' Circuit Low

What does this mean?

What are the Possible Causes of the DTC P07B9?

Faulty Transmission Park Position Sensor/Switch
Transmission Park Position Sensor/Switch harness is open or shorted
Transmission Park Position Sensor/Switch circuit poor electrical connection

How to Fix the DTC P07B9?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P07B9 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.